Objective c 为什么不是'；我的UIImageView对象是否实时绘制？

以下

UIImageView

仅在我退出后才会在我的ViewController窗口上绘制

-（void）playOn:（UIViewController*）currentViewController

方法。为什么呢？我怎样才能在该方法执行时从该方法内部绘制ViewController

画师

-(void)paintGoodCellonViewController:(UIViewController*)playingViewController
{
    int x = 32*(xAxis - 1);
    int y = 384 - (32* yAxis);

    UIImageView* myImageView = [[UIImageView alloc] initWithImage:goodCell];
    myImageView.frame = CGRectMake(x,y, 32, 32);
    [playingViewController.view addSubview:myImageView];
}

游戏

-(void)playOn:(UIViewController*) currentViewController
{    
    [currentPainter paintGoodCellonViewController:currentViewController];

    while(!self.stopButtonPressed)
    {
        // code...
    }
}

MyViewController.m

- (IBAction)enterButtonPressed:(UIButton *)sender
{
    [currentGame performSelectorInBackground:@selector(playOn:) withObject:self];
}

- (IBAction)giveUpButtonPressed:(UIButton *)sender
{
    currentGame.stopButtonPressed = YES;

}

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使用此代码强制

UIView

重画：

[myView setNeedsDisplay];

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你的意思是我调用

[myImageView setNeedsDisplay]紧跟在[playingViewController.view添加子视图：myImageView]之后在上述设置中，或在该设置之前？将视图添加到UI后调用它。另一方面，你可能想要阅读。