原文地址：http://blog.csdn.net/crazy_frog/article/details/8664108
// 添加所有的手势
- (void) addGestureRecognizerToView:(UIView *)view
{
// 旋转手势
UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];
[view addGestureRecognizer:rotationGestureRecognizer]; // 缩放手势
UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];
[view addGestureRecognizer:pinchGestureRecognizer]; // 移动手势
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];
[view addGestureRecognizer:panGestureRecognizer];
} // 处理旋转手势
- (void) rotateView:(UIRotationGestureRecognizer *)rotationGestureRecognizer
{
UIView *view = rotationGestureRecognizer.view;
if (rotationGestureRecognizer.state == UIGestureRecognizerStateBegan || rotationGestureRecognizer.state == UIGestureRecognizerStateChanged) {
view.transform = CGAffineTransformRotate(view.transform, rotationGestureRecognizer.rotation);
[rotationGestureRecognizer setRotation:];
}
} // 处理缩放手势
- (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{
UIView *view = pinchGestureRecognizer.view;
if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) {
view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);
pinchGestureRecognizer.scale = ;
}
} // 处理拖拉手势
- (void) panView:(UIPanGestureRecognizer *)panGestureRecognizer
{
UIView *view = panGestureRecognizer.view;
if (panGestureRecognizer.state == UIGestureRecognizerStateBegan || panGestureRecognizer.state == UIGestureRecognizerStateChanged) {
CGPoint translation = [panGestureRecognizer translationInView:view.superview];
[view setCenter:(CGPoint){view.center.x + translation.x, view.center.y + translation.y}];
[panGestureRecognizer setTranslation:CGPointZero inView:view.superview];
}
}
这样只需要简单调用
[self addGestureRecognizerToView:view]; //如果处理的是图片，别忘了
[imageView setUserInteractionEnabled:YES];
[imageView setMultipleTouchEnabled:YES];
具体使用一下：
在.h文件里边定义变量
@interface YourViewController : UIViewController<UIGestureRecognizerDelegate>
{
CGFloat lastScale;
CGRect oldFrame; //保存图片原来的大小
CGRect largeFrame; //确定图片放大最大的程度
}
然后在viewDidLoad里面加上
- (void)viewDidLoad
{
[super viewDidLoad]; showImgView = [[UIImageView alloc] initWithFrame:<span class="s1">CGRectMake</span>(<span class="s2"></span>, <span class="s2"></span>, , )];
[showImgView setMultipleTouchEnabled:YES];
[showImgView setUserInteractionEnabled:YES];
[showImgView setImage:[UIImage imageNamed:@"1.jpg"]]; oldFrame = showImgView.frame;
largeFrame = CGRectMake( - screenSize.width, - screenSize.height, * oldFrame.size.width, * oldFrame.size.height); [self addGestureRecognizerToView:showImgView];
[self.view addSubview:showImgView];
这样就实现了
但是，这样是不够的。
因为里边的缩放和移动等没有做相应的判断。
因为代码很简洁，所以扩展也非常方便。
我修改了缩放的代码，增加了限制，其他的类似
// 处理缩放手势
- (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer
{
UIView *view = pinchGestureRecognizer.view;
if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) {
view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);
if (showImgView.frame.size.width < oldFrame.size.width) {
showImgView.frame = oldFrame;
//让图片无法缩得比原图小
}
if (showImgView.frame.size.width > * oldFrame.size.width) {
showImgView.frame = largeFrame;
}
pinchGestureRecognizer.scale = ;
}
}
这样就保证了图片的最大和最小比例。