把小图像放在UIImageView的顶部？

Question

我在一个页面中有一个UIImageView，它从Interface构建器获取它的图像，我试图在它的顶部放置小图标（这是一个小地图，我想在其上放置图标）。我知道它可能很简单，但我试着在文档中查找它，但它让我更加困惑。

Answer 1

使用Interface Builder，你不能只将UIImageView拖入现有的UIImageView吗？实际上，最终会将一个UIImageView嵌入另一个UIImageView中。

您还应该能够在代码中轻松设置“小地图”UIImageView的隐藏属性，具体取决于是否需要UIImageView。

希望这会有所帮助。祝你好运。

• 让它知道

Answer 2

你可以通过添加大小UIViewImage视图来编写自己的UIView。

我已经用Pseudocode说明了我的方法。

-(id) initwithFrame:(CGRect) frame
{

  if(self = [super initWithFrame:frame])
  {

   iContainer = [[UIView alloc] initWithFrame:frame];

   [iContainer addSubViews:iLargerUIImageView];
   [iContainer addSubViews:iSmallUIImageView];

   [self.view addSubViews:iContainer];
  }
  return self;
}
-(void) layoutSubviews
{
    CGRect myRect = self.frame;
    iContainer.frame = myRect;
    //Give the location to iLargerUIImageView as per your requirement.
     iLargerUIImageView.frame = CGRectMake(...,...,...,...);
    //Give the location to iSmallUIImageViewas per your requirement.  
    iSmallUIImageView.frame = CGRectMake(...,...,...,...);

}

-(void) dealloc
{
  [iContainer release];
  [iLargerUIImageView release];
  [iSmallUIImageView release];
}

Answer 3

试试这段代码：

UIImageView * backgroundImageView =（UIImageView *）[self viewWithTag：kBckGndImag];

if(!backgroundImageView){
    UIImage *imageName  =   [UIImage imageNamed:kpointsChartBig];

    backgroundImageView =   [[UIImageView alloc] initWithFrame:CGRectMake(15, 15, imageName.size.width, imageName.size.height)]; 

    backgroundImageView.image=imageName;

    [backgroundImageView setTag:kBckGndImag];

    [pointImageView addSubview:backgroundImageView];

    [backgroundImageView release];
}

UIImageView *foregroundImageView = (UIImageView *)[self viewWithTag:kForGndImage];

if(!foregroundImageView){
    foregroundImageView =       [[UIImageView alloc] initWithImage:[UIImage imageNamed:kpointsColoredChartBig]];

    foregroundImageView.contentMode = UIViewContentModeLeft;

    foregroundImageView.clipsToBounds = YES;

    [pointImageView addSubview:foregroundImageView];

    [foregroundImageView release];
}