在矩形内查找子视图

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问题描述

我有一个大的UIView和许多小的subviews.我需要找到一个区域内的所有subviews.我目前正在遍历subviews并使用CGRectContainsPoint.可以，但是通常有90％的子视图不在我感兴趣的矩形内.

I have a large UIView with many small subviews. I need to find all subviews within an area. I am currently iterating through subviews and using CGRectContainsPoint. This works, but 90% of the subviews are usually not within my rectangle of interest.

有没有更有效的方法来找到矩形内的所有subviews?

Is there a more efficient way to find all subviews within a rectangle?

谢谢

推荐答案

CGRectContainsRect会更合适.您仍然需要根据对位置的假定情况来遍历矩形中的所有子视图，但是CGRectContainsRect仍然比CGRectContainsPoint更有意义.

CGRectContainsRect would be more appropriate. You'd still need to loop through all subviews that might be in your rect based on what you can assume about their positions, but CGRectContainsRect still makes more sense than CGRectContainsPoint.

CGRect area = CGRectMake(10,10,200,200);
NSMutableArray *viewsWithinArea = [[NSMutableArray alloc] init];
for (UIView *aView in [self.view subviews]) {
   if(CGRectContainsRect(area,aView.frame)) [views addObject:aView];
}

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