将 UIimageView 置于最前面

Question

我有一个 ViewController，其中有一个 UIScrollView。在那上面我有一个 UIView 和 UIView 我必须添加标签和图像。图片应该在我的标签上方。

顺序为Controller>>ScrollView>>UIView >> UILAbel >> UIImageView

但我无法将 UIimageView 添加到视图中。

这是我的代码

 scrollView =[[UIScrollView alloc]init];
[scrollView setFrame:CGRectMake(0, 0, 320, 480)];
 [scrollView setContentSize:CGSizeMake(320,2820)];
[scrollView setBackgroundColor:[UIColor groupTableViewBackgroundColor]];
[scrollView setScrollEnabled:YES];
[scrollView setShowsHorizontalScrollIndicator:YES];
[scrollView setShowsVerticalScrollIndicator:NO];
[self.view addSubview:scrollView];


    UIView *firstView = [[UIView alloc]initWithFrame:CGRectMake(5, 5, 310, 300)];
firstView.backgroundColor = [UIColor whiteColor];
[scrollView addSubview:firstView];


UILabel *label =[[UILabel alloc]initWithFrame:CGRectMake(65, 3, 180, 50)];
label.text = @"ABC";
label.textAlignment =NSTextAlignmentCenter;
label.textColor = [UIColor colorWithRed:74.0/255.0 green:144.0/255.0 blue:226.0/255.0 alpha:1];
label.font=[UIFont fontWithName:@"Helvetica-Bold" size:18];
[firstView addSubview:label];

 imgView = [[UIImageView alloc]initWithFrame:CGRectMake(115, 0, 90, 90)];
imgView.image = [UIImage imageNamed:@"thumbs4.png"];
[self.view bringSubviewToFront:imgView];

[self.view bringSubviewToFront:imgView] 这一行什么都不做

Answer 1

您应该先将图像视图添加到 self.view，然后再对其进行操作。但如果它是最后添加的子视图，则没有必要将其置于最前面。

imgView = [[UIImageView alloc]initWithFrame:CGRectMake(115, 0, 90, 90)];
imgView.image = [UIImage imageNamed:@"thumbs4.png"];
[self.view addSubview:imgView] // added as subview
[self.view bringSubviewToFront:imgView]; // not really needed. imgView is actually in front

Answer 2

UIScrollView *scrollView =[[UIScrollView alloc]init];
[scrollView setFrame:CGRectMake(0, 0, 320, 480)];
[scrollView setContentSize:CGSizeMake(320,2820)];
[scrollView setBackgroundColor:[UIColor groupTableViewBackgroundColor]];
[scrollView setScrollEnabled:YES];
[scrollView setShowsHorizontalScrollIndicator:YES];
[scrollView setShowsVerticalScrollIndicator:NO];
[self.view addSubview:scrollView];

UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(115, 0, 90, 90)];
imgView.image = [UIImage imageNamed:@"dream.jpg"];
[self.view addSubview:imgView];

UIView *firstView = [[UIView alloc]initWithFrame:CGRectMake(5, 5, 310, 300)];
firstView.backgroundColor = [UIColor blueColor];
[scrollView addSubview:firstView];


UILabel *label =[[UILabel alloc]initWithFrame:CGRectMake(65, 3, 180, 50)];
label.text = @"ABC";
label.textAlignment =NSTextAlignmentCenter;
label.textColor = [UIColor colorWithRed:74.0/255.0 green:144.0/255.0 blue:226.0/255.0 alpha:1];
label.font=[UIFont fontWithName:@"Helvetica-Bold" size:18];
[firstView addSubview:label];

我得到了这样的输出

将 UIimageView 置于最前面

Bring UIimageView to front

iphone

objective-c

uiimageview

ios