如何在多个UIViews或UIImageViews上使用UIGestureRecognizers进行轻拍、收缩和旋转

Question

我不知道该如何处理:-/

我只需要在图像上添加贴纸。应用程序将包含像笑脸，心(图像)选择特定的贴纸，它将被添加到主图像和用户可以操纵贴纸，如他旋转，缩放等，用户可以选择多个贴纸，可以做旋转缩放等添加的贴纸，

请指导如何实现这一点，我能够执行图像处理与单个贴纸我不知道如何执行多个贴纸选择，用户可以再次返回到任何贴纸上进行操作。

Answer 1

您可以使用此方法添加手势：

- (void) addGestureRecognizers{
    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
    [panRecognizer setMinimumNumberOfTouches:1];
    [panRecognizer setMaximumNumberOfTouches:1];
    [self addGestureRecognizer:panRecognizer];

    UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
    self.multipleTouchEnabled = YES;
    [self addGestureRecognizer:rotateRecognizer];

    UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    [self addGestureRecognizer:pinchRecognizer];

    UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)];
    longPressRecognizer.minimumPressDuration = 2.0;
    [self addGestureRecognizer:longPressRecognizer];
}

并实现这些选择器：

- (void) move:(UIPanGestureRecognizer *)recognizer{
    CGPoint translation = [recognizer translationInView:self.superview];
    recognizer.view.center = CGPointMake(recognizer.view.center.x+translation.x, recognizer.view.center.y+translation.y);
    [recognizer setTranslation:CGPointMake(0, 0) inView:self.superview];
}

- (void) rotate:(UIRotationGestureRecognizer *)recognizer{
    NSLog(@"Rotate");
    recognizer.view.transform = CGAffineTransformRotate(
                                                        recognizer.view.transform,
                                                        recognizer.rotation);
    recognizer.rotation = 0;
}

- (void) pinch:(UIPinchGestureRecognizer *)recognizer{
    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
    recognizer.scale = 1; 
}

- (void) longPressed:(UILongPressGestureRecognizer *)recognizer{
    NSLog(@"Long Pressed");
}

注释：根据需要更改值

Answer 2

我希望当你点击特定的图像时，你会将手势添加到图像视图中，你想在该特定的图像上执行一些操作，然后尝试这样做可能会对你有所帮助

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageTapped:)];

..。

- (void)imageTapped:(UITapGestureRecognizer *)sender
{
    UIView *selectedView = sender.view; 
    //perform action here

    or

  sender.view.frame=newFrame;//you can set your frame
}

添加这个用于同步手势识别。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES:
}