UIview 如何防止第一次绕anchor point旋转时的跳动

weixin_33712881

于 2012-03-06 15:01:00 发布

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原文链接：http://www.cnblogs.com/pengyingh/articles/2381970.html

本文详细阐述了在iOS应用中通过处理触摸事件，实现视图位置与触摸点位置之间的联动，包括触摸开始与移动时的坐标转换与位置更新机制。

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- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];
    CGPoint locationInView = [touch locationInView:self];
    CGPoint locationInSuperview = [touch locationInView:self.superview];

    self.layer.anchorPoint = CGPointMake(locationInView.x / self.frame.size.width, locationInView.y / self.frame.size.height);
    self.center = locationInSuperview;
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];
    CGPoint locationInSuperview = [touch locationInView:self.superview];

    self.center = locationInSuperview;
}