如何在超视图中定位UIView?

时间:2013-03-12 20:34:33

标签: ios uiview uiimageview frame bounds

我添加了一个带有UIImage的UIImageView,我希望它出现在主UIView的中心顶部。

我将使用UIPageControl将该视图向左滑动并从右侧引入新视图。我添加了UIImageView,通常只是将它添加到右下角

-(void)createUIViews{
    UIImage *image1 = [UIImage imageNamed:@"GiftCard.png"];
    firstView = [[UIImageView alloc] initWithImage:image1];
    firstView.backgroundColor = [UIColor grayColor];
    firstView.tag = 1;
    firstView.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin);
}

现在我希望将它定位在顶部中心。所以我想到这样的事情:

CGRect newFrame = self.view.frame;
    newFrame.origin.x += 50;
    self.view.frame = newFrame;

    [self.view addSubview:firstView];

但是当我在前一个底部添加此代码时(从viewDidLoad调用btw),图像仍然显示在右下角。我该如何正确定位?

2 个答案:

答案 0 :(得分:3)

将代码移至viewDidAppear。在viewWillAppear / viewDidAppear之前,不保证设置边界和框架。

答案 1 :(得分:1)

确保正确设置支柱和弹簧,然后执行此操作:

 -(void)viewWillAppear:(BOOL)animated 
  {
    [super viewWillAppear:animated];
    firstView.center = self.center;
  }