// 初始化一个UIimageView
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 100, 300, 300)];
imageView.image = [UIImage imageNamed:@"12.jpg"];
// UIImageView的用户交互是默认关闭的，要想使他可以处理触摸事件，我们得手动打开它
[imageView setUserInteractionEnabled:YES];
[self.window addSubview:imageView];
//初始化一个视图（响应者）来承载手势
UIView *gestureView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
//当前视图放置到屏幕中央
gestureView.center = self.window.center;
gestureView.backgroundColor = [UIColor yellowColor];
[self.window addSubview:gestureView];
1、轻拍手势
//创建轻拍手势
UITapGestureRecognizer *tapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
设置触控对象，和轻拍的次数
//设置触控对象的个数（几个手指）
[tapGR setNumberOfTouchesRequired:1];
//设置轻拍次数
[tapGR setNumberOfTapsRequired:2];
//给创建好的视图添加手势
[gestureView addGestureRecognizer:tapGR];
//轻拍手势的回调方法
- (void)tapAction:(UITapGestureRecognizer*)sender{
//可以根据手势得到它当前所作用的视图
UIImageView *imageView = (UIImageView*)sender.view;
//得到textfield viewWithTag此方法的返回值为UIView类型，但是UITextField为UIView的子类，父类对象不能直接指向子类对象，所以需要强制转换
UITextField *textField = (UITextField*)[self.window viewWithTag:1000];
// //回收键盘，取消第一响应者
[textField resignFirstResponder];
NSLog(@"我轻拍了gestureView");}
2、捏合手势
//创建捏合手势 UIPinchGestureRecognizer* pinchGR = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
pinchGR.delegate = self; // 可以在同一个视图上实现多个手势
//捏合手势的回调方法
- (void)pinchAction:(UIPinchGestureRecognizer*)sender{
//通过捏合手势的到缩放比率
float scale = sender.scale;
//得到该手势所作用的视图
UIView *view = sender.view;
//2D仿射变换函数中的缩放函数来实现视图的放大缩小
//是在原有基础上来改变当前的视图
//函数的第一个参数：现有的视图的transform值
//第二个参数：x轴上的缩放比率
//第三个参数:y轴上的缩放比率
//是在视图最初的transform状态上改变，不管执行多少次，都是以该视图最 初的transform状态为基础来改变
view.transform = CGAffineTransformMakeScale(2, 2);
//view.transform = CGAffineTransformScale(view.transform, scale, scale);
//每次捏合动作完毕之后，让此捏合值复原，使得它每次都是从100%开始缩放
sender.scale = 1;
}
3、旋转手势
//旋转手势
UIRotationGestureRecognizer* rotaGR = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotaAction:)];
rotaGR.delegate = self;
//旋转手势回调方法
- (void)rotaAction:(UIRotationGestureRecognizer*)sender{
//通过手势的到旋转角度
float rota = sender.rotation;
//得到该手势作用的视图
UIView *view = sender.view;
//通过2D仿射变换函数中的旋转函数来使得当前视图旋转
view.transform = CGAffineTransformRotate(view.transform, rota);
//复原
// sender.rotation = 0; sender.rotation = 0;
}
4、平移手势
//平移手势
UIPanGestureRecognizer *panGP = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAction:)];
//平移手势的回调方法
- (void)panAction:(UIPanGestureRecognizer*)sender{
//得到当前手势所在视图
UIView *view = sender.view;
//得到我们在视图上移动的偏移量
CGPoint currentPoint = [sender translationInView:view.superview];
//通过2D仿射变换函数中与位移有关的函数实现视图位置变化
view.transform = CGAffineTransformTranslate(view.transform,currentPoint.x, currentPoint.y);
//复原
// 每次都是从00点开始
[sender setTranslation:CGPointZero inView:view.superview];
}
5、边缘轻扫手势
//边缘轻扫手势
UIScreenEdgePanGestureRecognizer *edgePanGR = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(edgePanAction:)];
edgePanGR.edges = UIRectEdgeAll;
//边缘轻扫手势回调方法
- (void)edgePanAction:(UIScreenEdgePanGestureRecognizer*)sender{
NSLog(@"我成功的触发了屏幕边缘手势");
}
6、长按手势
// 长按手势
UILongPressGestureRecognizer *longPressPR = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
longPressPR.minimumPressDuration = 1;
//长按手势的回调方法
- (void)longPressAction:(UILongPressGestureRecognizer *)sender{
if (sender.state == UIGestureRecognizerStateEnded) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"看你麻痹" message:@"不服你咬死我" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
[alertView show];
}}
7、轻扫手势
// 轻扫手势
UISwipeGestureRecognizer *swipeGR = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)];
// 轻扫手势的回调方法
- (void)swipeAction:(UISwipeGestureRecognizer *)sender{
if (sender.state == UIGestureRecognizerStateEnded) {
UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:@"槽尼玛" delegate:self cancelButtonTitle:@"纸张" destructiveButtonTitle:@"哈哈哈" otherButtonTitles:@"切毛毛", nil];
[actionSheet showInView:self.window];
}}
给imageView视图添加手势
// 给图片添加手势 一个视图可以添加多种手势，但是一个手势，只能添加到一个视图上
[imageView addGestureRecognizer:tapGR];
[imageView addGestureRecognizer:pinchGR];
[imageView addGestureRecognizer:rotaGR];
[imageView addGestureRecognizer:panGR];
[imageView addGestureRecognizer:edgePanGR];
[imageView addGestureRecognizer:longPressPR];
[imageView addGestureRecognizer:swipeGR];
当一个视图上想要添加多种手势的时候就要用到手势的代理(重点)
pragma mark ----手势的代理方法
// 使得多个手势可以同时响应
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
// 返回值为YES的时候，当执行一个手势的操作的时候，也可以执行其他手势的操作
return YES;
}
