iOS11 [[UIApplication sharedApplication].windows lastObject]
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// iOS11后 [[UIApplication sharedApplication].windows lastObject] 无法获取最外层window,导致一些提示层无法显示;尝试之后发现可通过 [[UIApplication sharedApplication].windows firstObject] 来获取最外层window;// 修改如下: UIWindow *mainWindow = nil; if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 11) { mainWindow = [[UIApplication sharedApplication].windows firstObject]; } else { mainWindow = [[UIApplication sharedApplication].windows lastObject]; }
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