ios开发之--找window，获取屏幕最上层的窗口

1、delegate

UIWindow *window = [[[UIApplication sharedApplication] delegate] window];

2、windows

获取当前最顶层的窗口

UIWindow *window = [[[UIApplication sharedApplication] windows] lastObject];

在实际需求中，讲某一UIView控件添加到最上层，可以考虑获取当前顶层的窗口来添加UIView控件，代码如下：

UIView *aView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 300)];
aView.backgroundColor = [UIColor redColor];
// 当前顶层窗口
UIWindow *window = [[UIApplication sharedApplication].windows lastObject];
// 添加到窗口
[window addSubview:aView];

仅做记录！