iphone - 拖动 UIButton 时 UIView 更改框架

Question

我有问题。我UIImageView有UIButton。

当我UIButton按箭头指示移动时，我需要更改UIImageView按钮的框架。UIImageView当我拖到UIButton顶部时我需要旋转。

我想我需要在 UIButton 中添加手势。UIImageView但是当我拖动时，我如何计算新框架UIButton？

谢谢

Answer 1

@synthesize resizableImageView;
@synthesize resizeButton;
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [resizeButton addTarget:self action:@selector(startDraggableCorner) forControlEvents:UIControlEventTouchDown];
    [resizeButton addTarget:self action:@selector(stopDraggableCorner) forControlEvents:UIControlEventTouchUpInside];
}
-(void)startDraggableCorner
{
    gestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(wasDragged:)];
    [[self view] addGestureRecognizer:gestureRecognizer];
}
-(void)wasDragged:(UIPanGestureRecognizer*)gesture
{
    CGRect imageFrame = [resizableImageView frame];
    imageFrame.size.height = [[gesture valueForKey:@"_lastScreenLocation"] CGPointValue].y - imageFrame.origin.y;
    imageFrame.size.width = [[gesture valueForKey:@"_lastScreenLocation"] CGPointValue].x - imageFrame.origin.x;
    [resizableImageView setFrame: imageFrame];
    CGRect buttonFrame = [resizeButton frame];
    buttonFrame.origin.x = [[gesture valueForKey:@"_lastScreenLocation"] CGPointValue].x;
    buttonFrame.origin.y = [[gesture valueForKey:@"_lastScreenLocation"] CGPointValue].y;
    [resizeButton setFrame:buttonFrame];

}
-(void)stopDraggableCorner
{
    [[self view] removeGestureRecognizer:gestureRecognizer];
}

这（几乎）在您可调整大小的行为中取得了成功。旋转图像，也许你可以检查是否[[gesture valueForKey:@"_lastScreenLocation"] CGPointValue].y低于一定数量，然后调用一个方法来旋转图像