多个 UIImageView 上的手势识别器

Question

我在同一个ViewController中有10个UIImageView，每一个都需要用一个手势识别器来控制；这是我的简单代码：

- (void)viewDidLoad {

   UIImageView *image1 = // image init
   UIImageView *image2 = // image init
   ...

    UIRotationGestureRecognizer *rotationGesture1 = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotatePiece:)];
    UIRotationGestureRecognizer *rotationGesture2 = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotatePiece:)];
    ...
    ...
    UIRotationGestureRecognizer *rotationGesture10 = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotatePiece:)];

    [image1 addGestureRecognizer:rotationGesture1];
    [image2 addGestureRecognizer:rotationGesture2];
    ...
    ...
    [image10 addGestureRecognizer:rotationGesture10];
}

- (void)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer {
    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
        [gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);
        [gestureRecognizer setRotation:0];
    }
}

好的，好的，每个图像都会旋转，但是我还需要为每个 UIImageView 的 UIPanGestureRecognizer 和 UIPinchGestureRecognizer、obv 编写类似的代码：这是正确的方法，还是有更简单的方法来避免像这样的“冗余”代码?谢谢！

Answer 1

这是一个可能的解决方案。制作一个这样的方法：

- (void)addRotationGestureForImage:(UIImageView *)image
{
    UIRotationGestureRecognizer *gesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotatePiece:)];
    gesture.delegate = self;
    [image addGestureRecognizer:gesture];
}

然后在您的 viewDidLoad 方法中创建一个图像视图数组并循环调用此方法，如下所示：

NSArray *imageViewArray = [NSArray arrayWithObjects:image1,image2,image3,nil];
for(UIImageView *img in imageViewArray) {
    [self addRotationGestureForImage:img];
}