iOS 获取当前window

 1 //获取当前window
 2 + (UIWindow *)mainWindow
 3 {
 4     UIApplication *app = [UIApplication sharedApplication];
 5     if ([app.delegate respondsToSelector:@selector(window)])
 6     {
 7         return [app.delegate window];
 8     }
 9     else
10     {
11         return [app keyWindow];
12     }
13 }
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原文地址：https://www.cnblogs.com/kfgcs/p/6387400.html