防止重复在view上添加view

柴犬安详.jpg

方法一

    NSArray *rtary = [UIApplication sharedApplication].keyWindow.subviews;
    for (int i = 0; i < rtary.count; i++)
    {
        UIView *isSHowView = rtary[i];
        if (isSHowView.tag == 560)
        {
            return;
        }
    }
    UIView *rView = [[UIView alloc] init];
    rView.tag = 560;

work.gif