view 在父view 拖动不过边界（UIPanGestureRecognizer）

最新推荐文章于 2024-05-06 12:52:18 发布

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本文详细阐述了如何在iOS应用中实现视图滑动时的响应机制，通过使用UIPanGestureRecognizer来捕捉滑动事件，并根据滑动位置调整视图中心坐标，确保视图始终保持在屏幕内。

- (void)viewDidPan:(UIPanGestureRecognizer*)sender

{

    CGPoint p = [sender translationInView:self.superview];

    if(sender.state == UIGestureRecognizerStateBegan){
        _initialPoint = self.center;
    }
    CGFloat newCenterX = _initialPoint.x + p.x;
    if (newCenterX <0) {
        newCenterX = 0;
    }else if (newCenterX > self.superview.bounds.size.width) {
        newCenterX = self.superview.bounds.size.width;
    }

    CGFloat newCenterY = _initialPoint.y + p.y;
    if (newCenterY < 0) {
        newCenterY = 0;
    }else if (newCenterY > self.superview.bounds.size.height) {
        newCenterY = self.superview.bounds.size.height;
    }

    self.center = CGPointMake(newCenterX, newCenterY);

}