iOS 快速实现分页界面的搭建。
项目中我们经常会遇到滚动分页的设计效果，被用来对不同数据界面的展示进行分类。我们先可以来预览一下实现效果：
界面展示效果.gif
实现分析
根据动图进行实现分析：这个效果的实现分为两部分顶部的QiPageMenuView和内容展示部分QiPageContentView:
QiPageMenuView是基于UIScrollView实现的，我们可以按照自己的项目需求，定制自己需要实现的效果。QiPageMenuView提供了可设置的属性有：菜单每一项是否根据文字的大小自适应宽度还是设置固定宽度、菜单的首项和最后一项距离父视图的间距、每一项之间的间距、包括了每一项QiPageItem的展示效果自定义等。也实现了菜单项超出一屏幕时自动滑动显示的效果：
QiPageMenuView滑动显示效果.gif
QiPageContentView是基于UIPageViewController实现的封装，在项目中可能有多处这样的界面效果。单纯的使用UIPageViewController写在相应的控制器中，添加相应的子控制器，通过实现UIPageViewController的数据源和代理协议也可以达到这种效果。但是UIPageViewController嵌套在主控制器中，耦合度比较高，代码量也比较大，若是多处需要使用这种效果，每次都写一遍UIPageViewController，效率和可移植性不高。
QiPageMenuView和QiPageContentView之间是解耦合的，彼此都可以作为单独的控件去使用。在设计构思时，菜单视图的样式有可能是QiPageMenuView样式之外的视图，若是两者耦合度太高，就变成了QiPageContentView + QiPageMenuView组合，能展现的效果就被限制了。
QiPageMenuView实现与使用
1.QiPageMenuView.h中展现了QiPageMenuView可实现定制的相关属性以及初始化方法介绍。
@interface QiPageMenuView : UIScrollView<QiPageControllerDelegate>
/**
菜单栏点击事件
*/
@property (nonatomic,copy)void(^pageItemClicked)(NSInteger clickedIndex,QiPageMenuView *menu);
/**
常态item的字体颜色
*/
@property (nonatomic,strong)UIColor *normalTitleColor;
/**
选中item的字体颜色
*/
@property (nonatomic,strong)UIColor *selectedTitleColor;
/**
常态item的字体
*/
@property (nonatomic,strong)UIFont *titleFont;
/**
选中Item的字体
*/
@property (nonatomic,strong)UIFont *selectedTitleFont;
/**
字体距离item两边的间距,itemsAutoResizing = YES时 设置有效
*/
@property (nonatomic,assign)CGFloat itemTitlePadding;
/**
item距上的间距。itemIsVerticalCentred = NO的时候设置有效
*/
@property (nonatomic,assign)CGFloat itemTopPadding;
/**
items的左边缩进
*/
@property (nonatomic,assign)CGFloat leftMargin;
/**
items的右边缩进
*/
@property (nonatomic,assign)CGFloat rightMargin;
/**
是否根据文字的长度自动计算item的width default YES
*/
@property (nonatomic,assign)BOOL itemsAutoResizing;
/**
item是否垂直居中显示，默认yes; itemTopPadding 与 lineTopPadding 不会生效；设置NO itemHeight会自适应高
*/
@property (nonatomic,assign)BOOL itemIsVerticalCentred;
/**
item之间的间距
*/
@property (nonatomic,assign)CGFloat itemSpace;
/**
每个item的高度
*/
@property (nonatomic,assign)CGFloat itemHeight;
/**
每个item的宽度。itemsAutoResizing = YES不必赋值也可。反之必须给值。
*/
@property (nonatomic,assign)CGFloat itemWidth;
/**
是否显示下划线 default YES
*/
@property (nonatomic,assign)BOOL hasUnderLine;
/**
下划线颜色
*/
@property (nonatomic,strong)UIColor *lineColor;
/**
下划线到item的间距
*/
@property (nonatomic,assign)CGFloat lineTopPadding;
/**
下划线的高度
*/
@property (nonatomic,assign)CGFloat lineHeight;
/**
下划线的宽度
*/
@property (nonatomic,assign)CGFloat lineWitdh;
/**
pageController滑动完成
*/
@property (nonatomic,assign)NSInteger pageScrolledIndex;
/**
初始化方法
*/
- (instancetype)initWithFrame:(CGRect)frame titles:(NSArray*)titles dataSource:(NSDictionary<QiPageMenuViewDataSourceKey, id> *)dataSource;
- (instancetype)initWithFrame:(CGRect)frame titles:(NSArray*)titles;
/**
滑动到某一项
@param pageItem item
*/
- (void)scrollToPageItem:(QiPageItem*)pageItem;
/*!
@brief 更新标题数组
@param items selectedIndex重置选中的item
*/
- (void)updateMenuViewWithNewItemArray:(NSArray *)items selectedIndex:(NSInteger)selectedIndex;
@end
2.QiPageMenuView滑动显示的核心代码
- (void)scrollToPageItem:(QiPageItem*)pageItem {
[self refreshUnderLineViewPosition:pageItem];
if (self.contentSize.width <= self.width) {
return;
}
CGRect originalRect = pageItem.frame;
CGRect convertRect = [self convertRect:originalRect toView:self.superview];
CGFloat targetX;
CGFloat realMidX = CGRectGetMinX(originalRect)+CGRectGetWidth(originalRect)/2;
if (CGRectGetMidX(convertRect) < CGRectGetMidX(self.frame)) {
//是否需要右滑
if (realMidX> CGRectGetMidX(self.frame)) {
targetX = realMidX-CGRectGetMidX(self.frame);
}else {
targetX = 0;
}
[self setContentOffset:CGPointMake(targetX, 0) animated:YES];
} else if (CGRectGetMidX(convertRect) > CGRectGetMidX(self.frame)) {
if (realMidX+CGRectGetMidX(self.frame)<self.contentSize.width) {
targetX = realMidX-CGRectGetMidX(self.frame);
} else {
targetX = self.contentSize.width - CGRectGetMaxX(self.frame);
}
[self setContentOffset:CGPointMake(targetX, 0) animated:YES];
}
}
- QiPageMenuView使用的两种方式
//定制样式
NSDictionary *dataSource = @{
QiPageMenuViewNormalTitleColor : [UIColor blackColor],
QiPageMenuViewSelectedTitleColor : [UIColor redColor],
QiPageMenuViewTitleFont : [UIFont systemFontOfSize:14],
QiPageMenuViewSelectedTitleFont : [UIFont systemFontOfSize:14],
QiPageMenuViewItemIsVerticalCentred : @(YES),
QiPageMenuViewItemTitlePadding : @(10.0),
QiPageMenuViewItemTopPadding : @(20.0),
QiPageMenuViewItemPadding : @(10.0),
QiPageMenuViewLeftMargin : @(20.0),
QiPageMenuViewRightMargin : @(20.0),
QiPageMenuViewItemsAutoResizing : @(YES),
QiPageMenuViewItemWidth : @(90.0),
QiPageMenuViewItemHeight : @(40.0),
QiPageMenuViewHasUnderLine :@(YES),
QiPageMenuViewLineColor : [UIColor greenColor],
QiPageMenuViewLineWidth : @(30.0),
QiPageMenuViewLineHeight : @(4.0),
QiPageMenuViewLineTopPadding : @(10.0)
};
QiPageMenuView *menuView = [[QiPageMenuView alloc]initWithFrame:CGRectMake(0, 0, self.view.width, 50) titles:@[@"消息",@"节日消息",@"广播通知",@"QISHARE",@"奇舞团"] dataSource:dataSource];
menuView.backgroundColor = [UIColor orangeColor];
[self.view addSubview:menuView];
QiPageMenuView *menuView = [[QiPageMenuView alloc]initWithFrame:CGRectMake(0, 0, self.view.width, 50) titles:@[@"系统消息",@"节日消息",@"广播通知"]];
menuView.backgroundColor = [UIColor orangeColor];
//定制样式
menuView.normalTitleColor = [UIColor blackColor];
menuView.selectedTitleColor = [UIColor redColor];
menuView.titleFont = [UIFont systemFontOfSize:14];
menuView.selectedTitleFont = [UIFont systemFontOfSize:14];
menuView.itemIsVerticalCentred = YES;
menuView.itemTitlePadding = 10.0;
menuView.itemTopPadding = 20.0;
menuView.itemSpace = 10.0;
menuView.leftMargin = 20.0;
menuView.rightMargin = 20.0;
menuView.itemsAutoResizing = YES;
menuView.itemWidth = 90;
menuView.itemHeight = 40;
menuView.hasUnderLine = YES;
menuView.lineColor = [UIColor greenColor];
menuView.lineWitdh = 30;
menuView.lineHeight = 4.0;
menuView.lineTopPadding = 10;
[self.view addSubview:menuView];
QiPageContentView实现与使用
- QiPageContentView.h
@interface QiPageContentView : UIView<UIPageViewControllerDelegate, UIPageViewControllerDataSource,UIScrollViewDelegate>
@property (nonatomic, strong) UIPageViewController *pageViewController;
@property (nonatomic, strong) NSArray *controllerArray; //!< 控制器数组
/**
滑动结束:block回调
*/
@property (nonatomic,copy)void(^pageContentViewDidScroll)(NSInteger currentIndex,NSInteger beforeIndex,QiPageContentView *pageView);
/**
滑动结束:代理回调 若实现block代理不会走
*/
@property (nonatomic, weak) id<QiPageContentViewDelegate> contentViewDelgate;
/**
设置滑动至某一个控制器
@param index index
@param beforeIndex 控制方向
*/
- (void)setPageContentShouldScrollToIndex:(NSInteger)index beforIndex:(NSInteger)beforeIndex;
/**
初始化方法
@param frame frame
@param childViewControllers childViewControllers
@return 实例
*/
- (instancetype)initWithFrame:(CGRect)frame childViewController:(NSArray*)childViewControllers;
@end
- QiPageContentView使用
QiPageContentView *contenView = [[QiPageContentView alloc]initWithFrame:CGRectMake(0, 10, self.view.width, self.view.height - 88-10) childViewController:@[ctrl,ctrl1,ctrl2,ctrl3]];
[self.view addSubview:contenView];
QiPageContentView与QiPageMenuView解耦
QiPageContentView与QiPageMenuView使用各自头文件中定义的协议或者block属性实现两者之间事件交互，从而达到分页联动效果；两者的解耦，使得它们的使用更加灵活。
- QiPageMenuView交互事件的传递
@protocol QiPageMenuViewDelegate <NSObject>
/**
菜单点击了某个item
@param index 点击了index
*/
- (void)pageMenuViewDidClickedIndex:(NSInteger)index beforeIndex:(NSInteger)beforeIndex;
@end
@interface QiPageMenuView : UIScrollView
/**
菜单栏点击事件:block回调
*/
@property (nonatomic,copy)void(^pageItemClicked)(NSInteger clickedIndex,NSInteger beforeIndex,QiPageMenuView *menu);
/**
菜单栏点击事件:代理回调 若实现block代理不会走
*/
@property (nonatomic, weak) id<QiPageMenuViewDelegate> menuViewDelgate;
2.QiPageContentView交互事件的传递
@protocol QiPageContentViewDelegate <NSObject>
/**
滑动完成回调
@param index 滑动至index
*/
- (void)pageContentViewDidScrollToIndex:(NSInteger)index beforeIndex:(NSInteger)beforeIndex;
@end
@interface QiPageContentView : UIView<UIPageViewControllerDelegate, UIPageViewControllerDataSource,UIScrollViewDelegate>
@property (nonatomic, strong) UIPageViewController *pageViewController;
@property (nonatomic, strong) NSArray *controllerArray; //!< 控制器数组
/**
滑动结束:block回调
*/
@property (nonatomic,copy)void(^pageContentViewDidScroll)(NSInteger currentIndex,NSInteger beforeIndex,QiPageContentView *pageView);
/**
滑动结束:代理回调 若实现block代理不会走
*/
@property (nonatomic, weak) id<QiPageContentViewDelegate> contentViewDelgate;
3.QiPageContentView和QiPageMenuView组合实现分页界面
QiPageMenuView *menuView = [[QiPageMenuView alloc]initWithFrame:CGRectMake(0, 0, self.view.width, 50) titles:@[@"系统消息",@"节日消息",@"广播通知",@"最新",@"最热"] dataSource:dataSource];
menuView.backgroundColor = [UIColor orangeColor];
[self.view addSubview:menuView];
QiPageContentView *contenView = [[QiPageContentView alloc]initWithFrame:CGRectMake(0, menuView.bottom+10, self.view.width, self.view.height - menuView.bottom - 10 - 88-10) childViewController:@[ctrl,ctrl1,ctrl2,ctrl3,ctrl4]];
[self.view addSubview:contenView];
menuView.pageItemClicked = ^(NSInteger clickedIndex, NSInteger beforeIndex, QiPageMenuView *menu) {
NSLog(@"点击了：之前：%ld 现在：%ld",beforeIndex,clickedIndex);
[contenView setPageContentShouldScrollToIndex:clickedIndex beforIndex:beforeIndex];
};
contenView.pageContentViewDidScroll = ^(NSInteger currentIndex, NSInteger beforeIndex, QiPageContentView * _Nonnull pageView) {
menuView.pageScrolledIndex = currentIndex;
NSLog(@"滚动了：之前：%ld 现在：%ld",beforeIndex,currentIndex);
};
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