在 UIImageView 上添加 UIPinchgesture 的哪个比例或在 UIImageView 包含的 UIView 上？

Question

专家！！ 请帮助我！！！！ 在我的项目中，我以编程方式创建多个 UIImageview。我想在每个 ImageView.i 上添加捏合手势 我的代码如下......

-(IBAction)addSymbols:(UIButton *)sender{
if (sender.tag ==1) {
CGRect frame =sender.frame;
[self.imgView setFrame:frame];
self.imgView.userInteractionEnabled = YES;
[imgView setImage:[sender imageForState:UIControlStateNormal]];
[self.view addSubview:imgView];
[self addGestureRecognizersToPiece:imgView];}

像这样我添加了 5 个图像视图。现在[self addGestureRecognizersToPiece:imgView]的代码

- (void)addGestureRecognizersToPiece:(UIView *)piece{
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scalePiece:)];
[piece  addGestureRecognizer:pinchGesture];

//In above add gesture on UIImageView directly its not working..
//if replace this line by [self.view addGestureRecognizer:pinchGesture]; it's working..
//but while pinch whole UIview scale

[pinchGesture setDelegate:self]; }

另一个错误是 UIPinchgesture 不能单独在多个 UIImageView 上正确工作。 所以请帮助我..尽快回复我..

- (void) scalePiece:(UIPinchGestureRecognizer*)paramSender{ 

if (paramSender.state == UIGestureRecognizerStateEnded) { 
self.currentScale = paramSender.scale;
} 
else if (paramSender.state == UIGestureRecognizerStateBegan && self.currentScale != 0.0f){ 

paramSender.scale = self.currentScale; }
 if (paramSender.scale != NAN && paramSender.scale != 0.0){ 
[paramSender view].transform= CGAffineTransformMakeScale(paramSender.scale, paramSender.scale); 
} 

正如你告诉我的，我为每个 UIImageView 添加了 userInteractionEnabled = YES。我在我的代码中也提到了

Answer 1

您应该在 UIImageViews 上启用userInteractionEnabled。默认情况下禁用此功能。

如果您需要更多帮助，请告诉我们您的scalePiece:code。

Answer 2

将 imageViews 添加为 ScrollView 的子视图。

然后设置scrollView的scrollView zoomScale。 还要实现scrollView的委托方法，尤其是下面那个。

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

返回要缩放的 imageView 对象。

参考这些 UIScrollView

UIScrollViewDelegate