擷取iOS應用中當前處於Activity狀態的ViewController

標籤：activity   uiviewcontroller   windows   class   uiview   

// 擷取當前處於activity狀態的view controller- (UIViewController *)activityViewController{    UIViewController* activityViewController = nil;        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;            }        }    }        NSArray *viewsArray = [window subviews];    if([viewsArray count] > 0)    {        UIView *frontView = [viewsArray objectAtIndex:0];                id nextResponder = [frontView nextResponder];                if([nextResponder isKindOfClass:[UIViewController class]])        {            activityViewController = nextResponder;        }        else        {            activityViewController = window.rootViewController;        }    }        return activityViewController;}

擷取iOS應用中當前處於Activity狀態的ViewController