1、Touch事件
//系统自动调用
//一个UITouch代表一根手指 按住option变成两根手指
//虽然是两个手指，但只执行一次触摸事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {} 开始触摸事件
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {} 手指移动事件
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {} 结束触摸时间
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {} 取消触摸手势
//获取任意手指
UITouch * touch = [touches anyObject];
//手指触摸的View
NSLog(@"touch.view:%@",touch.view);
//点击次数
NSLog(@"点击次数:%ld",touch.tapCount);
//当前手指的位置
CGPoint currentPonit = [touch locationInView:touch.view];
//上一次手指所处的位置
CGPoint previousPonit = [touch previousLocationInView:touch.view];
2、事件分发
事件产生和传递的过程：
当发生触摸事件的时候，先传递给UIApplication，以队列结构接收事件。传递给主窗口，主窗口传递给控制器的UIView,遍历UIView的子视图，寻找最合适的UIView来接收。
响应者链：
该类的上一级如果是UIView,子视图处理事件，如果处理不了，找他的父视图。
该类的上一级如果是UIViewController,则是由所属的控制器来处理。
//返回最合适的UIView
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {}
//判断当前的点在不在View上
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
return YES;
}
3、UIImageView点击事件
self.imageView.userInteractionEnabled = NO;
//无法响应事件的3种情况：
//1、当userInteractionEnabled未开启
//2、当hidden属性为YES
//3、当alpha属性为0时
//将以YellowView为坐标系的点，转化为以button为坐标系的点 self = yellowView
CGPoint buttonPoint = [self convertPoint:point toView:self.button];
这个函数的用处是判断当前的点击或者触摸事件的点是否在当前的view中。
它被hitTest:withEvent:调用，
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event; // default returns YES if point is in bounds
4、手机摇一摇
//事件的种类
- (void)motionBegan:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event {
if (motion == UIEventSubtypeMotionShake) {
NSLog(@"摇一摇");
}
}
5、**Gesture手势
UIGestureRecognizerState：
开始： UIGestureRecognizerStateBegan
改变： UIGestureRecognizerStateChanged
结束： UIGestureRecognizerStateEnded
取消： UIGestureRecognizerStateCancelled
失败： UIGestureRecognizerStateFailed,
//同时使用两个手势 捏合 旋转
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
（1）点击手势 Tap
UITapGestureRecognizer * tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction1:)];
//点击一次便触发
tap1.numberOfTapsRequired = 1;
[self.imageView addGestureRecognizer:tap1];
UITapGestureRecognizer * tap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction2:)];
//双击一次便触发
tap2.numberOfTapsRequired = 2;
[self.imageView addGestureRecognizer:tap2];
//如果tap2成功执行，让tap1失败
[tap1 requireGestureRecognizerToFail:tap2];
（2）长按手势 LongPress
UILongPressGestureRecognizer * longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAction:)];
[self.imageView addGestureRecognizer:longGesture];
（3）轻扫手势 Swipe
UISwipeGestureRecognizer * swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
//设置轻扫方向
swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;
[self.imageView addGestureRecognizer:swipeGesture];
（4）捏合事件 Pinch
UIPinchGestureRecognizer * pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
pinchGesture.delegate = self;
[self.imageView addGestureRecognizer:pinchGesture];
self.pin = pinchGesture;
//对应事件
- (void)pinchAction:(UIPinchGestureRecognizer *)pin {
self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pin.scale, pin.scale);
//复位
pin.scale = 1;
}
（5）旋转事件 Rotation
UIRotationGestureRecognizer * rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
rotationGesture.delegate = self;
[self.imageView addGestureRecognizer:rotationGesture];
//对应事件
- (void)rotationAction:(UIRotationGestureRecognizer *)rotation {
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);
//复位
rotation.rotation = 0;
}
（6）拖动手势 Pan
UIPanGestureRecognizer * panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
[self.imageView addGestureRecognizer:panGesture];
//对应事件
- (void)panAction:(UIPanGestureRecognizer *)pan {
//获取拖动的偏移量
CGPoint ponit = [pan translationInView:self.view];
self.imageView.center = CGPointMake(self.imageView.center.x + ponit.x, self.imageView.center.y + ponit.y);
//复位
[pan setTranslation:CGPointZero inView:self.imageView];
}