iOS 获取当前正在显示的ViewController

//获取当前屏幕显示的ViewController

  • (UIViewController *)getCurrentVC
    {
    UIViewController *result = nil;
    //找到当前显示的View
    UIWindow * window = [[UIApplication sharedApplication] keyWindow];
    if (window.windowLevel != UIWindowLevelNormal)
    {
    NSArray *windows = [[UIApplication sharedApplication] windows];
    for(UIWindow * tmpWin in windows)
    {
    if (tmpWin.windowLevel == UIWindowLevelNormal)
    {
    window = tmpWin;
    break;
    }
    }
    }
    //获取View的ViewController
    UIView *frontView = [[window subviews] objectAtIndex:0];
    id nextResponder = [frontView nextResponder];

    if ([nextResponder isKindOfClass:[UIViewController class]])
    result = nextResponder;
    else
    result = window.rootViewController;

    return result;
    }

我们在非视图类中想要随时展示一个view时,需要将被展示的view加到当前view的子视图,或用当前view presentViewController,或pushViewContrller,这些操作都需要获取当前正在显示的ViewController。

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