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iOS-UIView方法属性介绍

iOS-UIView方法属性介绍

作者: malgee | 来源:发表于2019-01-02 17:24 被阅读8次
    /** 动画的曲线枚举 */
    typedef NS_ENUM(NSInteger, UIViewAnimationCurve) {
        UIViewAnimationCurveEaseInOut,  //!< 慢进慢出(默认值).
        UIViewAnimationCurveEaseIn,     //!< 慢进.
        UIViewAnimationCurveEaseOut,    //!< 慢出.
        UIViewAnimationCurveLinear,     //!< 匀速.
    };
     
    //!< UIView内容填充模式.
    typedef NS_ENUM(NSInteger, UIViewContentMode) {
        UIViewContentModeScaleToFill,       //!< 缩放内容到合适比例大小.
        UIViewContentModeScaleAspectFit,    //!< 缩放内容到合适的大小,边界多余部分透明.
        UIViewContentModeScaleAspectFill,   //!< 缩放内容填充到指定大小,边界多余的部分省略.
        UIViewContentModeRedraw,            //!< 重绘视图边界 (需调用 -setNeedsDisplay).
        UIViewContentModeCenter,            //!< 视图保持等比缩放.
        UIViewContentModeTop,               //!< 视图顶部对齐.
        UIViewContentModeBottom,            //!< 视图底部对齐.
        UIViewContentModeLeft,              //!< 视图左侧对齐.
        UIViewContentModeRight,             //!< 视图右侧对齐.
        UIViewContentModeTopLeft,           //!< 视图左上角对齐.
        UIViewContentModeTopRight,          //!< 视图右上角对齐.
        UIViewContentModeBottomLeft,        //!< 视图左下角对齐.
        UIViewContentModeBottomRight,       //!< 视图右下角对齐.
    };
     
    /** UIView动画过渡效果 */
    typedef NS_ENUM(NSInteger, UIViewAnimationTransition) {
        UIViewAnimationTransitionNone,          //!< 无效果.
        UIViewAnimationTransitionFlipFromLeft,  //!< 沿视图垂直中心轴左到右移动.
        UIViewAnimationTransitionFlipFromRight, //!< 沿视图垂直中心轴右到左移动.
        UIViewAnimationTransitionCurlUp,        //!< 由底部向上卷起.
        UIViewAnimationTransitionCurlDown,      //!< 由顶部向下展开.
    };
     
    /** 自动调整大小方式 */
    typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
        UIViewAutoresizingNone                 = 0,     //!< 不自动调整.
        UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,//!< 自动调整与superView左边的距离,保证与superView右边的距离不变.
        UIViewAutoresizingFlexibleWidth        = 1 << 1,//!< 自动调整自己的宽度,保证与superView左边和右边的距离不变.
        UIViewAutoresizingFlexibleRightMargin  = 1 << 2,//!< 自动调整与superView的右边距离,保证与superView左边的距离不变.
        UIViewAutoresizingFlexibleTopMargin    = 1 << 3,//!< 自动调整与superView顶部的距离,保证与superView底部的距离不变.
        UIViewAutoresizingFlexibleHeight       = 1 << 4,//!< 自动调整自己的高度,保证与superView顶部和底部的距离不变.
        UIViewAutoresizingFlexibleBottomMargin = 1 << 5 //!< 自动调整与superView底部的距离,也就是说,与superView顶部的距离不变.
    };
     
    /** UIView动画选项 */
    typedef NS_OPTIONS(NSUInteger, UIViewAnimationOptions) {
        UIViewAnimationOptionLayoutSubviews            = 1 <<  0, //!< 动画过程中保证子视图跟随运动.
        UIViewAnimationOptionAllowUserInteraction      = 1 <<  1, //!< 动画过程中允许用户交互.
        UIViewAnimationOptionBeginFromCurrentState     = 1 <<  2, //!< 所有视图从当前状态开始运行.
        UIViewAnimationOptionRepeat                    = 1 <<  3, //!< 重复运行动画.
        UIViewAnimationOptionAutoreverse               = 1 <<  4, //!< 动画运行到结束点后仍然以动画方式回到初始点.
        UIViewAnimationOptionOverrideInheritedDuration = 1 <<  5, //!< 忽略嵌套动画时间设置.
        UIViewAnimationOptionOverrideInheritedCurve    = 1 <<  6, //!< 忽略嵌套动画速度设置.
        UIViewAnimationOptionAllowAnimatedContent      = 1 <<  7, //!< 动画过程中重绘视图(注意仅仅适用于转场动画).
        UIViewAnimationOptionShowHideTransitionViews   = 1 <<  8, //!< 视图切换时直接隐藏旧视图、显示新视图,而不是将旧视图从父视图移除(仅仅适用于转场动画).
        UIViewAnimationOptionOverrideInheritedOptions  = 1 <<  9, //!< 不继承父动画设置或动画类型.
        
        UIViewAnimationOptionCurveEaseInOut            = 0 << 16, //!< 动画先缓慢,然后逐渐加速.
        UIViewAnimationOptionCurveEaseIn               = 1 << 16, //!< 动画逐渐变慢.
        UIViewAnimationOptionCurveEaseOut              = 2 << 16, //!< 动画逐渐加速.
        UIViewAnimationOptionCurveLinear               = 3 << 16, //!< 动画匀速执行,默认值.
        
        UIViewAnimationOptionTransitionNone            = 0 << 20, //!< 没有转场动画效果.
        UIViewAnimationOptionTransitionFlipFromLeft    = 1 << 20, //!< 从左侧翻转效果.
        UIViewAnimationOptionTransitionFlipFromRight   = 2 << 20, //!< 从右侧翻转效果.
        UIViewAnimationOptionTransitionCurlUp          = 3 << 20, //!< 向后翻页的动画过渡效果.
        UIViewAnimationOptionTransitionCurlDown        = 4 << 20, //!< 向前翻页的动画过渡效果.
        UIViewAnimationOptionTransitionCrossDissolve   = 5 << 20, //!< 旧视图溶解消失显示下一个新视图的效果.
        UIViewAnimationOptionTransitionFlipFromTop     = 6 << 20, //!< 从上方翻转效果.
        UIViewAnimationOptionTransitionFlipFromBottom  = 7 << 20, //!< 从底部翻转效果.
        
        UIViewAnimationOptionPreferredFramesPerSecondDefault     = 0 << 24, //!< 默认的帧每秒.
        UIViewAnimationOptionPreferredFramesPerSecond60          = 3 << 24, //!< 60帧每秒的帧速率.
        UIViewAnimationOptionPreferredFramesPerSecond30          = 7 << 24, //!< 30帧每秒的帧速率.
        
    } NS_ENUM_AVAILABLE_IOS(4_0);
     
    typedef NS_OPTIONS(NSUInteger, UIViewKeyframeAnimationOptions) {
        UIViewKeyframeAnimationOptionLayoutSubviews            = UIViewAnimationOptionLayoutSubviews, //!< 动画过程中保证子视图跟随运动.
        UIViewKeyframeAnimationOptionAllowUserInteraction      = UIViewAnimationOptionAllowUserInteraction, //!< 动画过程中允许用户交互.
        UIViewKeyframeAnimationOptionBeginFromCurrentState     = UIViewAnimationOptionBeginFromCurrentState, //!< 所有视图从当前状态开始运行.
        UIViewKeyframeAnimationOptionRepeat                    = UIViewAnimationOptionRepeat, //!< 重复运行动画.
        UIViewKeyframeAnimationOptionAutoreverse               = UIViewAnimationOptionAutoreverse, //!< 动画运行到结束点后仍然以动画方式回到初始点.
        UIViewKeyframeAnimationOptionOverrideInheritedDuration = UIViewAnimationOptionOverrideInheritedDuration, //!< 忽略嵌套动画时间设置.
        UIViewKeyframeAnimationOptionOverrideInheritedOptions  = UIViewAnimationOptionOverrideInheritedOptions, //!< 不继承父动画设置或动画类型.
        
        UIViewKeyframeAnimationOptionCalculationModeLinear     = 0 << 10, //!< 连续运算模式, 默认.
        UIViewKeyframeAnimationOptionCalculationModeDiscrete   = 1 << 10, //!< 离散运算模式.
        UIViewKeyframeAnimationOptionCalculationModePaced      = 2 << 10, //!< 均匀执行运算模式.
        UIViewKeyframeAnimationOptionCalculationModeCubic      = 3 << 10, //!< 平滑运算模式.
        UIViewKeyframeAnimationOptionCalculationModeCubicPaced = 4 << 10  //!< 平滑均匀运算模式.
    } NS_ENUM_AVAILABLE_IOS(7_0);
     
    typedef NS_ENUM(NSUInteger, UISystemAnimation) {
        UISystemAnimationDelete,    //!< 系统删除动画
    } NS_ENUM_AVAILABLE_IOS(7_0);
     
    typedef NS_ENUM(NSInteger, UIViewTintAdjustmentMode) {
        UIViewTintAdjustmentModeAutomatic,  //!< 自动的,与父视图相同.
        
        UIViewTintAdjustmentModeNormal,     //!< 未经修改的.
        UIViewTintAdjustmentModeDimmed,     //!< 饱和、暗淡的原始色.
    } NS_ENUM_AVAILABLE_IOS(7_0);
     
    typedef NS_ENUM(NSInteger, UISemanticContentAttribute) {
        UISemanticContentAttributeUnspecified = 0,  //!< 未指定,默认值
        UISemanticContentAttributePlayback,         //!< 打开/ RW / FF等播放控制按钮
        UISemanticContentAttributeSpatial,          //!< 控制导致某种形式的定向改变UI中,如分段控制文本对齐方式或在游戏中方向键
        UISemanticContentAttributeForceLeftToRight, //!< 视图总是从左向右布局.
        UISemanticContentAttributeForceRightToLeft  //!< 视图总是从右向左布局.
    } NS_ENUM_AVAILABLE_IOS(9_0);
     
    @protocol UICoordinateSpace <NSObject>
     
    /** 将像素point由point所在视图转换到目标视图view中,返回在目标视图view中的像素值 */
    - (CGPoint)convertPoint:(CGPoint)point toCoordinateSpace:(id <UICoordinateSpace>)coordinateSpace NS_AVAILABLE_IOS(8_0);
    /** 将像素point由point所在视图转换到目标视图view中,返回在目标视图view中的像素值 */
    - (CGPoint)convertPoint:(CGPoint)point fromCoordinateSpace:(id <UICoordinateSpace>)coordinateSpace NS_AVAILABLE_IOS(8_0);
    /** 将rect由rect所在视图转换到目标视图view中,返回在目标视图view中的rect */
    - (CGRect)convertRect:(CGRect)rect toCoordinateSpace:(id <UICoordinateSpace>)coordinateSpace NS_AVAILABLE_IOS(8_0);
    /** 将rect从view中转换到当前视图中,返回在当前视图中的rect */
    - (CGRect)convertRect:(CGRect)rect fromCoordinateSpace:(id <UICoordinateSpace>)coordinateSpace NS_AVAILABLE_IOS(8_0);
     
    /** 获取bounds */
    @property (readonly, nonatomic) CGRect bounds NS_AVAILABLE_IOS(8_0);
     
    @end
     
    @class UIBezierPath, UIEvent, UIWindow, UIViewController, UIColor, UIGestureRecognizer, UIMotionEffect, CALayer, UILayoutGuide;
     
    NS_CLASS_AVAILABLE_IOS(2_0) @interface UIView : UIResponder <NSCoding, UIAppearance, UIAppearanceContainer, UIDynamicItem, UITraitEnvironment, UICoordinateSpace, UIFocusItem, CALayerDelegate>
     
    /** 返回主layer所使用的类 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(class, nonatomic, readonly) Class layerClass;
    #else
    + (Class)layerClass;
    #endif
     
    /** 通过Frame初始化UI对象 */
    - (instancetype)initWithFrame:(CGRect)frame NS_DESIGNATED_INITIALIZER;
    /** 用于xib初始化 */
    - (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;
     
    /** 设置用户交互,默认YES允许用户交互 */
    @property(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled;
    /** 控件标记(父控件可以通过tag找到对应的子控件),默认为0 */
    @property(nonatomic)                                 NSInteger tag;
    /** 视图图层(可以用来设置圆角效果/阴影效果) */
    @property(nonatomic,readonly,strong)                 CALayer  *layer;
     
    /** 返回是否可以成为焦点, 默认NO */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(nonatomic,readonly) BOOL canBecomeFocused NS_AVAILABLE_IOS(9_0);
    #else
    - (BOOL)canBecomeFocused NS_AVAILABLE_IOS(9_0);
    #endif
    /** 是否可以被聚焦 */
    @property (readonly, nonatomic, getter=isFocused) BOOL focused NS_AVAILABLE_IOS(9_0);
     
    /** 左右滑动翻转效果 */
    @property (nonatomic) UISemanticContentAttribute semanticContentAttribute NS_AVAILABLE_IOS(9_0);
     
    /** 获取视图的方向 */
    + (UIUserInterfaceLayoutDirection)userInterfaceLayoutDirectionForSemanticContentAttribute:(UISemanticContentAttribute)attribute NS_AVAILABLE_IOS(9_0);
     
    /** 获取相对于指定视图的界面方向 */
    + (UIUserInterfaceLayoutDirection)userInterfaceLayoutDirectionForSemanticContentAttribute:(UISemanticContentAttribute)semanticContentAttribute relativeToLayoutDirection:(UIUserInterfaceLayoutDirection)layoutDirection NS_AVAILABLE_IOS(10_0);
     
    /** 返回即时内容的布局的方向 */
    @property (readonly, nonatomic) UIUserInterfaceLayoutDirection effectiveUserInterfaceLayoutDirection NS_AVAILABLE_IOS(10_0);
     
    @end
     
    @interface UIView(UIViewGeometry)
     
    /** 位置和尺寸(以父控件的左上角为坐标原点(0, 0)) */
    @property(nonatomic) CGRect            frame;
     
    /** 位置和尺寸(以自己的左上角为坐标原点(0, 0)) */
    @property(nonatomic) CGRect            bounds;
    /** 中心点(以父控件的左上角为坐标原点(0, 0)) */
    @property(nonatomic) CGPoint           center;
    /** 变形属性(平移\缩放\旋转) */
    @property(nonatomic) CGAffineTransform transform;
    /** 视图内容的缩放比例 */
    @property(nonatomic) CGFloat           contentScaleFactor NS_AVAILABLE_IOS(4_0);
     
    /** 是否支持多点触摸,默认NO */
    @property(nonatomic,getter=isMultipleTouchEnabled) BOOL multipleTouchEnabled __TVOS_PROHIBITED;
    /** 是否独占整个Touch事件,默认NO */
    @property(nonatomic,getter=isExclusiveTouch) BOOL       exclusiveTouch __TVOS_PROHIBITED;
     
    /** 在指定点上点击测试指定事件 */
    - (nullable UIView *)hitTest:(CGPoint)point withEvent:(nullable UIEvent *)event;
    /** 判断当前的点击或者触摸事件的点是否在当前的view中,默认返回YES */
    - (BOOL)pointInside:(CGPoint)point withEvent:(nullable UIEvent *)event;
     
    /** 将像素point由point所在视图转换到目标视图view中,返回在目标视图view中的像素值 */
    - (CGPoint)convertPoint:(CGPoint)point toView:(nullable UIView *)view;
    /** 将像素point由point所在视图转换到目标视图view中,返回在目标视图view中的像素值 */
    - (CGPoint)convertPoint:(CGPoint)point fromView:(nullable UIView *)view;
    /** 将rect由rect所在视图转换到目标视图view中,返回在目标视图view中的rect */
    - (CGRect)convertRect:(CGRect)rect toView:(nullable UIView *)view;
    /** 将rect从view中转换到当前视图中,返回在当前视图中的rect */
    - (CGRect)convertRect:(CGRect)rect fromView:(nullable UIView *)view;
     
    /** 自动调整子视图尺寸,默认YES则会根据autoresizingMask属性自动调整子视图尺寸 */
    @property(nonatomic) BOOL               autoresizesSubviews;
    /** 自动调整子视图与父视图的位置,默认UIViewAutoresizingNone */
    @property(nonatomic) UIViewAutoresizing autoresizingMask;
     
    /** 返回“最佳”大小适合给定的大小 */
    - (CGSize)sizeThatFits:(CGSize)size;
    /** 调整为刚好合适子视图大小 */
    - (void)sizeToFit;
     
    @end
     
    @interface UIView(UIViewHierarchy)
     
    /** 获取父视图 */
    @property(nullable, nonatomic,readonly) UIView       *superview;
    /** 获取所有子视图 */
    @property(nonatomic,readonly,copy) NSArray<__kindof UIView *> *subviews;
    /** 获取视图所在的Window */
    @property(nullable, nonatomic,readonly) UIWindow     *window;
     
    /** 从父视图中移除控件 */
    - (void)removeFromSuperview;
    /** 插入子视图(将子视图插入到subviews数组中index这个位置) */
    - (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;
    /** 交换subviews数组中所存放子视图的位置 */
    - (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2;
     
    /** 添加子视图(新添加的视图在subviews数组的后面, 显示在最上面) */
    - (void)addSubview:(UIView *)view;
    /** 插入子视图(将子视图插到siblingSubview之下) */
    - (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;
    /** 插入子视图(将子视图插到siblingSubview之上) */
    - (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview;
     
    /** 将子视图拉到最上面来显示 */
    - (void)bringSubviewToFront:(UIView *)view;
    /** 将子视图拉到最下面来显示 */
    - (void)sendSubviewToBack:(UIView *)view;
     
    ##pragma mark - 系统自动调用(留给子类去实现)
    /** 添加自视图完成后调用 */
    - (void)didAddSubview:(UIView *)subview;
    /** 将要移除自视图时调用 */
    - (void)willRemoveSubview:(UIView *)subview;
     
    /** 将要移动到新父视图时调用 */
    - (void)willMoveToSuperview:(nullable UIView *)newSuperview;
    /** 移动到新父视图完成后调用 */
    - (void)didMoveToSuperview;
    /** 将要移动到新Window时调用 */
    - (void)willMoveToWindow:(nullable UIWindow *)newWindow;
    /** 移动到新Window完成后调用 */
    - (void)didMoveToWindow;
     
    /** 判断view是否为子类 */
    - (BOOL)isDescendantOfView:(UIView *)view;
    /** 通过tag获得对应的子视图 */
    - (nullable __kindof UIView *)viewWithTag:(NSInteger)tag;
     
    /** 对现在有布局有调整更改后,使用这个方法进行更新 */
    - (void)setNeedsLayout;
    /** 强制进行更新layout */
    - (void)layoutIfNeeded;
     
    /** 控件的frame发生改变的时候就会调用,一般在这里重写布局子控件的位置和尺寸 */
    - (void)layoutSubviews;
     
    /** 设置view之间的间距,该属性只对autolayout布局有效 */
    @property (nonatomic) UIEdgeInsets layoutMargins NS_AVAILABLE_IOS(8_0);
    /** 是否将当前视图的间距和父视图相同,默认是NO */
    @property (nonatomic) BOOL preservesSuperviewLayoutMargins NS_AVAILABLE_IOS(8_0);
    /** 改变view的layoutMargins这个属性时,会触发这个方法 */
    - (void)layoutMarginsDidChange NS_AVAILABLE_IOS(8_0);
     
    /** 视图间距引导 */
    @property(readonly,strong) UILayoutGuide *layoutMarginsGuide NS_AVAILABLE_IOS(9_0);
     
    /** 获取此区域的内的布局引导 */
    @property (nonatomic, readonly, strong) UILayoutGuide *readableContentGuide  NS_AVAILABLE_IOS(9_0);
    @end
     
    @interface UIView(UIViewRendering)
     
    /** 重写drawRect方法,在可以这里进行绘图操作。*/
    - (void)drawRect:(CGRect)rect;
     
    /** 标记整个视图的边界矩形需要重绘, 调用这个方法会自动调用drawRect方法 */
    - (void)setNeedsDisplay;
    /** 标记在指定区域内的视图的边界需要重绘, 调用这个方法会自动调用drawRect方法 */
    - (void)setNeedsDisplayInRect:(CGRect)rect;
     
    /** 是否裁剪超出Bounds范围的子控件,默认NO */
    @property(nonatomic)                 BOOL              clipsToBounds;
    /** 设置背景颜色,默认nil */
    @property(nullable, nonatomic,copy)  UIColor          *backgroundColor UI_APPEARANCE_SELECTOR;
    /** 设置透明度(范围0.0~1.0),默认1.0 */
    @property(nonatomic)                 CGFloat           alpha;
    /** 设置是否不透明,默认YES不透明 */
    @property(nonatomic,getter=isOpaque) BOOL              opaque;
    /** 视图重绘前是否先清理以前的内容,默认YES */
    @property(nonatomic)                 BOOL              clearsContextBeforeDrawing;
    /** 设置是否隐藏,默认NO不隐藏 */
    @property(nonatomic,getter=isHidden) BOOL              hidden;
    /** 内容显示的模式,默认UIViewContentModeScaleToFill */
    @property(nonatomic)                 UIViewContentMode contentMode;
    /** 拉伸属性,如图片拉伸 */
    @property(nonatomic)                 CGRect            contentStretch NS_DEPRECATED_IOS(3_0,6_0) __TVOS_PROHIBITED;
     
    /** 蒙板view */
    @property(nullable, nonatomic,strong)          UIView           *maskView NS_AVAILABLE_IOS(8_0);
     
    /** 改变应用程序的外观的颜色。默认为nil */
    @property(null_resettable, nonatomic, strong) UIColor *tintColor NS_AVAILABLE_IOS(7_0);
     
    /** 可以使tintColor变暗,因此整个视图层次变暗 */
    @property(nonatomic) UIViewTintAdjustmentMode tintAdjustmentMode NS_AVAILABLE_IOS(7_0);
     
    /** 覆盖这个方法的目的是为了当tintColor改变的时候自定义一些行为 */
    - (void)tintColorDidChange NS_AVAILABLE_IOS(7_0);
     
    @end
     
    @interface UIView(UIViewAnimation)
     
    /** 开始动画 */
    + (void)beginAnimations:(nullable NSString *)animationID context:(nullable void *)context;
    /** 提交动画 */
    + (void)commitAnimations;
     
    /** 设置动画代理, 默认nil */
    + (void)setAnimationDelegate:(nullable id)delegate;
    /** 动画将要开始时执行方法(必须要先设置动画代理), 默认NULL */
    + (void)setAnimationWillStartSelector:(nullable SEL)selector;
    /** 动画已结束时执行方法(必须要先设置动画代理), 默认NULL */
    + (void)setAnimationDidStopSelector:(nullable SEL)selector;
    /** 设置动画时长, 默认0.2秒 */
    + (void)setAnimationDuration:(NSTimeInterval)duration;
    /** 动画延迟执行时间, 默认0.0秒 */
    + (void)setAnimationDelay:(NSTimeInterval)delay;
    /** 设置在动画块内部动画属性改变的开始时间, 默认now ([NSDate date]) */
    + (void)setAnimationStartDate:(NSDate *)startDate;
    /** 设置动画曲线, 默认UIViewAnimationCurveEaseInOut */
    + (void)setAnimationCurve:(UIViewAnimationCurve)curve;
    /** 动画的重复播放次数, 默认0 */
    + (void)setAnimationRepeatCount:(float)repeatCount;
    /** 设置是否自定翻转当前的动画效果, 默认NO */
    + (void)setAnimationRepeatAutoreverses:(BOOL)repeatAutoreverses;
    /** 设置动画从当前状态开始播放, 默认NO */
    + (void)setAnimationBeginsFromCurrentState:(BOOL)fromCurrentState;
     
    /** 在动画块中为视图设置过渡动画 */
    + (void)setAnimationTransition:(UIViewAnimationTransition)transition forView:(UIView *)view cache:(BOOL)cache;
     
    /** 设置是否激活动画 */
    + (void)setAnimationsEnabled:(BOOL)enabled;
    /** 返回一个布尔值表示动画是否结束 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(class, nonatomic, readonly) BOOL areAnimationsEnabled;
    #else
    + (BOOL)areAnimationsEnabled;
    #endif
    /** 先检查动画当前是否启用,然后禁止动画,执行block内的方法,最后重新启用动画,而且这个方法不会阻塞基于CoreAnimation的动画 */
    + (void)performWithoutAnimation:(void (NS_NOESCAPE ^)(void))actionsWithoutAnimation NS_AVAILABLE_IOS(7_0);
     
    /** 当前动画的持续时间 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(class, nonatomic, readonly) NSTimeInterval inheritedAnimationDuration NS_AVAILABLE_IOS(9_0);
    #else
    + (NSTimeInterval)inheritedAnimationDuration NS_AVAILABLE_IOS(9_0);
    #endif
     
    @end
     
    @interface UIView(UIViewAnimationWithBlocks)
     
    /** 用于对一个或多个视图的改变的持续时间、延时、选项动画完成时的操作 */
    + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(4_0);
     
    /** 用于对一个或多个视图的改变的持续时间、选项动画完成时的操作,默认:delay = 0.0, options = 0 */
    + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(4_0);
     
    /** 用于对一个或多个视图的改变的持续时间内动画完成时的操作,默认:delay = 0.0, options = 0, completion = NULL */
    + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations NS_AVAILABLE_IOS(4_0);
     
    /** 使用与物理弹簧运动相对应的定时曲线执行视图动画 */
    + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay usingSpringWithDamping:(CGFloat)dampingRatio initialSpringVelocity:(CGFloat)velocity options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(7_0);
     
    /** 为指定的容器视图创建转换动画 */
    + (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^ __nullable)(void))animations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(4_0);
     
    /** 使用给定的参数在指定视图之间创建转换动画 */
    + (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(4_0); // toView added to fromView.superview, fromView removed from its superview
     
    /** 在一个或多个视图上执行指定的系统提供的动画,以及定义的可选并行动画 */
    + (void)performSystemAnimation:(UISystemAnimation)animation onViews:(NSArray<__kindof UIView *> *)views options:(UIViewAnimationOptions)options animations:(void (^ __nullable)(void))parallelAnimations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(7_0);
     
    @end
     
    /** UIView的关键帧动画 */
    @interface UIView (UIViewKeyframeAnimations)
     
    /** 创建一个动画块对象,可用于为当前视图设置基于关键帧的动画 */
    + (void)animateKeyframesWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewKeyframeAnimationOptions)options animations:(void (^)(void))animations completion:(void (^ __nullable)(BOOL finished))completion NS_AVAILABLE_IOS(7_0);
    /** 添加指定开始时间、持续时间的关键帧动画(起始和持续时间是0.0和1.0之间的值) */
    + (void)addKeyframeWithRelativeStartTime:(double)frameStartTime relativeDuration:(double)frameDuration animations:(void (^)(void))animations NS_AVAILABLE_IOS(7_0);
     
    @end
     
    @interface UIView (UIViewGestureRecognizers)
     
    /** 当前视图所附加的所有手势识别器 */
    @property(nullable, nonatomic,copy) NSArray<__kindof UIGestureRecognizer *> *gestureRecognizers NS_AVAILABLE_IOS(3_2);
     
    /** 添加一个手势识别器 */
    - (void)addGestureRecognizer:(UIGestureRecognizer*)gestureRecognizer NS_AVAILABLE_IOS(3_2);
    /** 移除一个手势识别器 */
    - (void)removeGestureRecognizer:(UIGestureRecognizer*)gestureRecognizer NS_AVAILABLE_IOS(3_2);
     
    /** 开始一个手势识别器 */
    - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer NS_AVAILABLE_IOS(6_0);
     
    @end
     
    @interface UIView (UIViewMotionEffects)
     
    /** 添加运动效果,当倾斜设备时视图稍微改变其位置 */
    - (void)addMotionEffect:(UIMotionEffect *)effect NS_AVAILABLE_IOS(7_0);
     
    /** 移除运动效果 */
    - (void)removeMotionEffect:(UIMotionEffect *)effect NS_AVAILABLE_IOS(7_0);
     
    /** 所有添加的运动效果 */
    @property (copy, nonatomic) NSArray<__kindof UIMotionEffect *> *motionEffects NS_AVAILABLE_IOS(7_0);
     
    @end
     
     
    typedef NS_ENUM(NSInteger, UILayoutConstraintAxis) {
        UILayoutConstraintAxisHorizontal = 0,   //!< 水平约束.
        UILayoutConstraintAxisVertical = 1      //!< 竖直约束.
    };
     
     
    @interface UIView (UIConstraintBasedLayoutInstallingConstraints)
     
    /** 获取所有约束 */
    @property(nonatomic,readonly) NSArray<__kindof NSLayoutConstraint *> *constraints NS_AVAILABLE_IOS(6_0);
     
    /** 添加一个约束 */
    - (void)addConstraint:(NSLayoutConstraint *)constraint NS_AVAILABLE_IOS(6_0);
    /** 添加多个约束 */
    - (void)addConstraints:(NSArray<__kindof NSLayoutConstraint *> *)constraints NS_AVAILABLE_IOS(6_0);
    /** 移除一个约束 */
    - (void)removeConstraint:(NSLayoutConstraint *)constraint NS_AVAILABLE_IOS(6_0);
    /** 移除多个约束 */
    - (void)removeConstraints:(NSArray<__kindof NSLayoutConstraint *> *)constraints NS_AVAILABLE_IOS(6_0);
    @end
     
     
    @interface UIView (UIConstraintBasedLayoutCoreMethods)
    /** 更新视图和其子视图的约束 */
    - (void)updateConstraintsIfNeeded NS_AVAILABLE_IOS(6_0);
    /** 为视图更新约束,可以重写这个方法来设置当前view局部的布局约束 */
    - (void)updateConstraints NS_AVAILABLE_IOS(6_0) NS_REQUIRES_SUPER;
    /** 视图的约束是否需要更新 */
    - (BOOL)needsUpdateConstraints NS_AVAILABLE_IOS(6_0);
    /** 设置视图的约束需要更新,调用这个方法,系统会调用updateConstraints去更新布局 */
    - (void)setNeedsUpdateConstraints NS_AVAILABLE_IOS(6_0);
    @end
     
     
    @interface UIView (UIConstraintBasedCompatibility)
     
    /** 是否启用自动布局约束,默认YES. IB默认是NO */
    @property(nonatomic) BOOL translatesAutoresizingMaskIntoConstraints NS_AVAILABLE_IOS(6_0);
     
    /** 是否使用约束布局 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(class, nonatomic, readonly) BOOL requiresConstraintBasedLayout NS_AVAILABLE_IOS(6_0);
    #else
    + (BOOL)requiresConstraintBasedLayout NS_AVAILABLE_IOS(6_0);
    #endif
     
    @end
     
     
    @interface UIView (UIConstraintBasedLayoutLayering)
     
    /** 返回给定框架的视图的对齐矩阵 */
    - (CGRect)alignmentRectForFrame:(CGRect)frame NS_AVAILABLE_IOS(6_0);
    /** 返回给定对齐矩形的视图的frame */
    - (CGRect)frameForAlignmentRect:(CGRect)alignmentRect NS_AVAILABLE_IOS(6_0);
     
    /** 返回从视图的frame上定义的对齐矩阵的边框 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(nonatomic, readonly) UIEdgeInsets alignmentRectInsets NS_AVAILABLE_IOS(6_0);
    #else
    - (UIEdgeInsets)alignmentRectInsets NS_AVAILABLE_IOS(6_0);
    #endif
     
    /** 返回满足基线约束条件的视图 */
    - (UIView *)viewForBaselineLayout NS_DEPRECATED_IOS(6_0, 9_0, "Override -viewForFirstBaselineLayout or -viewForLastBaselineLayout as appropriate, instead") __TVOS_PROHIBITED;
     
    /** 返回用于满足第一基线约束的视图 */
    @property(readonly,strong) UIView *viewForFirstBaselineLayout NS_AVAILABLE_IOS(9_0);
     
    /** 返回用于满足上次基线约束的视图 */
    @property(readonly,strong) UIView *viewForLastBaselineLayout NS_AVAILABLE_IOS(9_0);
     
     
    UIKIT_EXTERN const CGFloat UIViewNoIntrinsicMetric NS_AVAILABLE_IOS(6_0); // -1
    /** 返回接收对象的原本大小 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(nonatomic, readonly) CGSize intrinsicContentSize NS_AVAILABLE_IOS(6_0);
    #else
    - (CGSize)intrinsicContentSize NS_AVAILABLE_IOS(6_0);
    #endif
    /** 废除视图原本内容的size */
    - (void)invalidateIntrinsicContentSize NS_AVAILABLE_IOS(6_0);
     
    /** 设置当视图要变大时,视图的压缩改变方式,返回一个优先权(确定view有多大的优先级阻止自己变大) */
    - (UILayoutPriority)contentHuggingPriorityForAxis:(UILayoutConstraintAxis)axis NS_AVAILABLE_IOS(6_0);
    /** 设置放先权 */
    - (void)setContentHuggingPriority:(UILayoutPriority)priority forAxis:(UILayoutConstraintAxis)axis NS_AVAILABLE_IOS(6_0);
     
    /** 设置当视图要变小时,视图的压缩改变方式,是水平缩小还是垂直缩小,并返回一个优先权(确定有多大的优先级阻止自己变小) */
    - (UILayoutPriority)contentCompressionResistancePriorityForAxis:(UILayoutConstraintAxis)axis NS_AVAILABLE_IOS(6_0);
    /** 设置优先权 */
    - (void)setContentCompressionResistancePriority:(UILayoutPriority)priority forAxis:(UILayoutConstraintAxis)axis NS_AVAILABLE_IOS(6_0);
    @end
     
    // Size To Fit
     
    UIKIT_EXTERN const CGSize UILayoutFittingCompressedSize NS_AVAILABLE_IOS(6_0);
    UIKIT_EXTERN const CGSize UILayoutFittingExpandedSize NS_AVAILABLE_IOS(6_0);
     
    @interface UIView (UIConstraintBasedLayoutFittingSize)
    /** 返回满足持有约束的视图的size */
    - (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize NS_AVAILABLE_IOS(6_0);
    /** 返回满足它所包含的约束的视图的大小 */
    - (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize withHorizontalFittingPriority:(UILayoutPriority)horizontalFittingPriority verticalFittingPriority:(UILayoutPriority)verticalFittingPriority NS_AVAILABLE_IOS(8_0);
    @end
     
    @interface UIView (UILayoutGuideSupport)
     
    /** 此视图拥有布局向导对象的数组 */
    @property(nonatomic,readonly,copy) NSArray<__kindof UILayoutGuide *> *layoutGuides NS_AVAILABLE_IOS(9_0);
     
    /** 向视图中添加布局向导 */
    - (void)addLayoutGuide:(UILayoutGuide *)layoutGuide NS_AVAILABLE_IOS(9_0);
     
    /** 向视图中添加布局向导 */
    - (void)removeLayoutGuide:(UILayoutGuide *)layoutGuide NS_AVAILABLE_IOS(9_0);
    @end
     
    @class NSLayoutXAxisAnchor,NSLayoutYAxisAnchor,NSLayoutDimension;
    @interface UIView (UIViewLayoutConstraintCreation)
    /** 布局视图的前缘框的布局锚点 */
    @property(readonly, strong) NSLayoutXAxisAnchor *leadingAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的后缘边框的布局锚点 */
    @property(readonly, strong) NSLayoutXAxisAnchor *trailingAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的左边框的布局锚点 */
    @property(readonly, strong) NSLayoutXAxisAnchor *leftAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的右边框的布局锚点 */
    @property(readonly, strong) NSLayoutXAxisAnchor *rightAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的顶边框的布局锚点 */
    @property(readonly, strong) NSLayoutYAxisAnchor *topAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的底边框的布局锚点 */
    @property(readonly, strong) NSLayoutYAxisAnchor *bottomAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的宽度 */
    @property(readonly, strong) NSLayoutDimension *widthAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的高度 */
    @property(readonly, strong) NSLayoutDimension *heightAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的水平中心轴 */
    @property(readonly, strong) NSLayoutXAxisAnchor *centerXAnchor NS_AVAILABLE_IOS(9_0);
    /** 布局视图的垂直中心轴 */
    @property(readonly, strong) NSLayoutYAxisAnchor *centerYAnchor NS_AVAILABLE_IOS(9_0);
    /** 一个代表对视图中的文本的最高线基线布置锚 */
    @property(readonly, strong) NSLayoutYAxisAnchor *firstBaselineAnchor NS_AVAILABLE_IOS(9_0);
    /** 一个代表对视图中的文本的最低线基线布置锚 */
    @property(readonly, strong) NSLayoutYAxisAnchor *lastBaselineAnchor NS_AVAILABLE_IOS(9_0);
     
    @end
     
    @interface UIView (UIConstraintBasedLayoutDebugging)
     
    /** 获得实体在不同方向上所有的布局约束 */
    - (NSArray<__kindof NSLayoutConstraint *> *)constraintsAffectingLayoutForAxis:(UILayoutConstraintAxis)axis NS_AVAILABLE_IOS(6_0);
     
    /** 可以知道当前视图的布局是否会有歧义 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(nonatomic, readonly) BOOL hasAmbiguousLayout NS_AVAILABLE_IOS(6_0);
    #else
    - (BOOL)hasAmbiguousLayout NS_AVAILABLE_IOS(6_0);
    #endif
     
    /** 这个方法会随机改变视图的layout到另外一个有效的layout。这样我们就可以很清楚的看到哪一个layout导致了整体的布局约束出现了错误,或者我们应该增加更多的布局约束 */
    - (void)exerciseAmbiguityInLayout NS_AVAILABLE_IOS(6_0);
    @end
     
    /** 约束调试,只在DEBUG环境下被调用 */
    @interface UILayoutGuide (UIConstraintBasedLayoutDebugging)
     
    /** 获得实体在不同方向上所有的布局约束 */
    - (NSArray<__kindof NSLayoutConstraint *> *)constraintsAffectingLayoutForAxis:(UILayoutConstraintAxis)axis NS_AVAILABLE_IOS(10_0);
     
    /** 可以知道当前视图的布局是否会有歧义 */
    #if UIKIT_DEFINE_AS_PROPERTIES
    @property(nonatomic, readonly) BOOL hasAmbiguousLayout NS_AVAILABLE_IOS(10_0);
    #else
    - (BOOL)hasAmbiguousLayout NS_AVAILABLE_IOS(10_0);
    #endif
    @end
     
    #pragma mark - View状态保存恢复
    @interface UIView (UIStateRestoration)
    /** 标示是否支持保存,恢复视图状态信息 */
    @property (nullable, nonatomic, copy) NSString *restorationIdentifier NS_AVAILABLE_IOS(6_0);
    /** 保存视图状态相关的信息 */
    - (void) encodeRestorableStateWithCoder:(NSCoder *)coder NS_AVAILABLE_IOS(6_0);
    /** 恢复和保持视图状态相关信息 */
    - (void) decodeRestorableStateWithCoder:(NSCoder *)coder NS_AVAILABLE_IOS(6_0);
    @end
     
    #pragma mark - View快照
    @interface UIView (UISnapshotting)
    /** 将当前显示的view截取成一个新的view */
    - (nullable UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates NS_AVAILABLE_IOS(7_0);
    /** 缩放一个view默认是从中心点进行缩放的 */
    - (nullable UIView *)resizableSnapshotViewFromRect:(CGRect)rect afterScreenUpdates:(BOOL)afterUpdates withCapInsets:(UIEdgeInsets)capInsets NS_AVAILABLE_IOS(7_0);
    /** 屏幕快照 */
    - (BOOL)drawViewHierarchyInRect:(CGRect)rect afterScreenUpdates:(BOOL)afterUpdates NS_AVAILABLE_IOS(7_0);
    @end
    
    

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