iphone - 如何检查 UIImageView 是否出现在 iphone 中的 View 位置

Question

我在特定位置有一个 imageview，我知道这个位置，但我想检查那个位置是否有一个 imageview。

请帮我解决

Answer 1

这是检查两个矩形是否重叠的辅助方法:

-(BOOL) rect:(CGRect)rect overlap:(CGRect)anotherRect
{
    BOOL xOverlap = ((rect.origin.x >= anotherRect.origin.x) && (rect.origin.x <= anotherRect.origin.x + anotherRect.size.width)) ||
                    ((anotherRect.origin.x >= rect.origin.x) && (anotherRect.origin.x <= rect.origin.x + rect.size.width));

    BOOL yOverlap = ((rect.origin.y >= anotherRect.origin.y) && (rect.origin.y <= anotherRect.origin.y + anotherRect.size.height)) ||
                    ((anotherRect.origin.y >= rect.origin.y) && (anotherRect.origin.y <= rect.origin.y + rect.size.height));

    return xOverlap && yOverlap;
}

用法:
您可以遍历 View 的所有 subview 并检查 View 的框架是否与另一个 View 的框架重叠。假设你有一个属性 myView 那么:

for(UIView *v in self.view.subviews)
    {
        if(v == self.myView) //skip the same view
            continue;

        if([self rect:self.myView.frame overlap:v.frame])
        {
            //Do something...
        }
    }