ios添加覆蓋在狀態欄的view

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, mScreenW, 20)];
view.backgroundColor = [UIColor redColor];

static UIWindow *newWindow;
if (newWindow == nil) {
    newWindow = [[UIWindow alloc] initWithFrame:view.bounds];
}
newWindow.windowLevel = UIWindowLevelStatusBar + 100;
[newWindow addSubview:view];
[newWindow makeKeyAndVisible];