ios - 圆形 View 上的 UIGestureRecognizer

Question

我有一个UIView，我使用下面的代码来使其圆润。

[myView setBackgroundColor:[UIColor redColor]];
[[myView layer] setCornerRadius:[myView bounds].size.height / 2.0f];
[[myView layer] setMasksToBounds:YES];
[myView setClipsToBounds:YES];

然后添加UIPanGestureRecognizer来移动盒子

UIPanGestureRecognizer *panGesture=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(boxIsMoving:)];
        [myView addGestureRecognizer:panGesture];

但问题是，当用户点击圆形之外但在实际框架中并开始拖动我的 View 时，我的 View 也开始移动。谁能建议我如何忽略回合外的触碰。

Answer 1

您可以使用此委托(delegate)方法。如果触摸超出圆角半径，则返回 NO。

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    CGPoint  touchPoint = [touch locationInView:myView];
    if (CGRectContainsPoint(myview.bounds, touchPoint))
    {
        CGFloat centerX = CGRectGetMidX(myView.bounds);
        CGFloat centerY = CGRectGetMidY(myView.bounds);
        CGFloat radius2 = pow((touchPoint.x -centerX),2)+ pow((touchPoint.y - centerY), 2);
        if (radius2 < pow(CGRectGetWidth(myView.frame)/2, 2))
        {
            return YES;
        }
    }
    return NO;
}