手势

UIresponder:响应者(传达者) 用来响应用户触摸屏幕的某些事件

标签：  UILabel

按钮：   UIButton

文本框：   UITextField

滚动视图：  UIScrollView

视图控制器: UIViewController

根视图：    RootViewController

分栏控制器：  UITabBarController

放图片的视图：   UIImageView

联系人通讯录：     UITableView

通讯录一行的视图 ：UITableViewCell

滑动点点点点:     UIPageControl

用户的默认信息：      NSUserDefaults

手势分为六大手势:

   六大手势全部都继承自UIGestureRecognizer

1、点击UITapGestureRecognizer

2、长按UILongPressGestureRecognizer

3、拖拽UIPanGestureRecognizer

4、捏合UIPinchGestureRecognizer

5、轻扫UISwipeGestureRecognizer

6、旋转UIRotationGestureRecognizer

初始化手势

UITapGestureRecognizer*tap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(actionOfTap:)];

设置点击手势的点击次数

tap.numberOfTapsRequired = 2;

设置点击手指的个数

tap.numberOfTouchesRequired = 2;

添加到视图是addGestureRecognizer: 而不是 addsubview:

[xx视图 addGestureRecognizer：xx手势];

minimumPressDuration设置长按的时间(多长时间才会调用长按触发事件)

1.手指开始触摸屏幕调用方法:- (void)touchesBegan:(NSSet *)touches withEvent:(nullable UIEvent *)event;

2.手指离开屏幕调用方法:- (void)touchesEnded:(NSSet *)touches withEvent:(nullable UIEvent *)event;

3.手指因外部事件取消触摸调用方法:- (void)touchesCancelled:(nullable NSSet *)touches withEvent:(nullable UIEvent *)event;

程序走的流程:用户点击屏幕触发->所有视图都继承UIResponder->UITuchBegin moved end

UITuchBegin moved end

获得点击视图的位置

CGPoint point = [xx手势locationInView：xx视图];

如果发现手势不调用.检查一下看是不是设置了背景颜色