xcode 关于带来SubviewToFront
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About bringSubviewToFront
提问by SajjadZare
I bring a control to front with the below code:
我使用以下代码将控件置于前面：
[self.view bringSubviewToFront:control];
How can I recognize between two controls; which one is in front and which one is in back
我如何在两个控件之间进行识别；哪个在前面，哪个在后面
采纳答案by Jonathan.
You would check the order of the view in the superview's (of the controls, in your case self.view) subviewsproperty.
您将在超级视图的（控件的，在您的情况下为 self.view）subviews属性中检查视图的顺序。
The view at the index 0 in the superview's subview is the view at the very back, and then the view at index 1 will be on top of it, and the view at index 2 will be on top of the view at index, etc
(basically a view is on top of the views with a lesser index compared to it's own index)
父视图子视图中索引 0 处的视图是最后面的视图，然后索引 1 处的视图将位于其顶部，索引 2 处的视图将位于索引处的视图之上，依此类推
（与它自己的索引相比，基本上一个视图位于索引较小的视图之上）
NSInteger indexOfControl1 = [[self.view subviews] indexOfObject:control1];
NSInteger indexOfControl2 = [[self.view subviews] indexOfObject:control2];
if (indexOfControl1 > indexOfControl2) {
//control1 is on top of control2
}
回答by Vladimir
If those controls have the same parent view their z-order is defined by their index in subviewsarray:
如果这些控件具有相同的父视图，则它们的 z 顺序由它们在subviews数组中的索引定义：
subviews: The order of the subviews in the array reflects their visible order on the screen, with the view at index 0 being the back-most view.
subviews：数组中子视图的顺序反映了它们在屏幕上的可见顺序，索引 0 处的视图是最后面的视图。
So your steps will be:
1. Get controls
2. Get their indexes in parent's subviews array (using indexOfObject:method)
3. Control with bigger index is in front
所以你的步骤将是：
1. 获取控件
2. 在父视图的子视图数组中获取它们的索引（使用indexOfObject:方法）
3. 具有更大索引的控件在前面
