手势，有规律的触摸事件的封装
手势类，抽象类，使用他的子类
UIGestureRecognizer 手势识别器
轻拍
UITapGestureRecognizer
长按
UILongPressGestureRecognizer
旋转
UIRotationGestureRecognizer
捏合
UIPinchGestureRecognizer
平移
UIPanGestureRecognizer
清扫
UISwipeGestureRecognizer
屏幕边缘清扫
UIScreenEdgePanGestureRecognizer
self.view.backgroundColor = [UIColor lightGrayColor];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 100, 350, 350)];
imageView.backgroundColor = [UIColor greenColor];
[self.view addSubview:imageView];
imageView.image = [UIImage imageNamed:@"6.jpg"];
imageView.contentMode = UIViewContentModeCenter;
//imageView， label 的用户交互默认是关闭的
imageView.userInteractionEnabled = YES;
//轻拍
//Target: 由谁来调用这个方法
//? 多态 =>
{
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
//需要轻拍几次
tap.numberOfTapsRequired = 1;
//需要几根手指
tap.numberOfTouchesRequired = 1;
//将轻拍手势添加到imageView上，别的控件也可以添加手势
[imageView addGestureRecognizer:tap];
}
//清扫
//在平移方法实现的情况下，清扫的优先级就没有平移的高
// {
// UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAction:)];
// //从左往右划，冲右往左划
// //对于NS_OPTIONS类型的枚举，可以使用或（ | ）来连接多个值
// //不能同时支持上下左右滑动
// swipe.direction = UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionLeft;
// swipe.numberOfTouchesRequired = 1;
// [imageView addGestureRecognizer:swipe];
// }
//长按
// {
// UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longAction:)];
//
// //长按运行了两次
// [imageView addGestureRecognizer:longPress];
// }
//旋转
// {
// UIRotationGestureRecognizer *rotain = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationAction:)];
//
// [imageView addGestureRecognizer:rotain];
// }
//平移
{
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
[imageView addGestureRecognizer:pan];
}
//捏合
{
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
[imageView addGestureRecognizer:pinch];
}
}
//方法写在那里就是哪里的方法
-
(void)tapAction:(UITapGestureRecognizer *)tap{
NSLog(@"点击");
//tap.view 获取手势所在的视图
//强转保证要强转的类型就是你需要的类型
UIImageView *imageView = (UIImageView *)tap.view;
imageView.image = [UIImage imageNamed:@"3.jpg"];
//怎么多次改变
}
-
(void)swipeAction:(UISwipeGestureRecognizer *)swipe{
NSLog(@"清扫");
UIImageView *imageView = (UIImageView *)swipe.view;
imageView.image = [UIImage imageNamed:@"3.jpg"];
} -
(void)longAction:(UILongPressGestureRecognizer *)longPress{
//判断，在长按手势生效的时候执行一次代码
if (longPress.state == UIGestureRecognizerStateBegan) {NSLog(@"长按"); UIImageView *imageView = (UIImageView *)longPress.view; imageView.image = [UIImage imageNamed:@"3.jpg"];}
}
- (void)rotationAction:(UIRotationGestureRecognizer *)rotation{
// 动画， transform2D放射变换
UIImageView *imageView = (UIImageView *)rotation.view;
imageView.transform = CGAffineTransformRotate(imageView.transform, rotation.rotation);
rotation.rotation = 0;
}
-
(void)panAction:(UIPanGestureRecognizer *)pan{
UIImageView *imageView = (UIImageView *)pan.view;
//获取平移手势在视图上移动的距离
CGPoint change = [pan translationInView:imageView];
imageView.transform = CGAffineTransformTranslate(imageView.transform, change.x , change.y);
[pan setTranslation:CGPointZero inView:imageView];
}
-
(void)pinchAction:(UIPinchGestureRecognizer *)pinch{
UIImageView *imageView = (UIImageView *)pinch.view;
imageView.transform = CGAffineTransformScale(imageView.transform, pinch.scale, pinch.scale);
//复位
pinch.scale = 1;
}
