ios - 如何在 ScrollView 中将图像置于最前面

Question

我在 ScrollView 中显示图像但我想知道如何在滚动时将每张图像放在中间的前面。它也位于彼此的背面，如下图所示。



我的代码:

-(void)scrollView2{

    _scrlView.backgroundColor = [UIColor blackColor];
    _scrlView.pagingEnabled = NO;
    _scrlView.bounces = false;
    _scrlView.delegate = self;
    _scrlView.showsHorizontalScrollIndicator = YES;
    _scrlView.layer.cornerRadius = 2;
    _scrlView.contentSize = CGSizeMake(_scrlView.frame.size.width, _scrlView.frame.size.height);

    _scrlView.contentSize = CGSizeMake(_scrlView.frame.size.width * 2, _scrlView.frame.size.height);

    CGRect screenRect = [[UIScreen mainScreen] bounds];
    CGFloat screenWidth = screenRect.size.width;
    CGFloat screenHeight = screenRect.size.height;

    int segment = screenWidth / 5;

    int screenX2 = screenHeight/2 - segment/2;

    __block float x = (screenWidth-segment)/2;

    NSArray *arrImages=[NSArray arrayWithObjects:@"Smiley-1.png",@"Smiley-2.png",@"Smiley-3.png",@"Smiley-4.png",@"Smiley-5.png", nil];

    for(int i=0;i<arrImages.count;i++)
    {
        UIImageView *imgVw=[[UIImageView alloc]init];
        [imgVw setFrame:CGRectMake(x, screenX2, segment, segment)];
        [imgVw setImage:[UIImage imageNamed:[NSString stringWithFormat:@"%@",[arrImages objectAtIndex:i]]]];
        [imgVw setBackgroundColor:[UIColor redColor]];
        [imgVw setContentMode:UIViewContentModeScaleToFill];
        [_scrlView addSubview:imgVw];

        x=x+segment;
    }

    [self.view addSubview:_scrlView];
}

float oldY;

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

  int scrollX = scrollView.contentOffset.x;
  int position = scrollX/segment;

  NSLog(@"X: %f , position: %d", scrollView.contentOffset.x , position);

  [_scrlView setContentOffset: CGPointMake(_scrlView.contentOffset.x, oldY)];
}

Answer 1

您可以使用将 subview 置于前面。例如
[scrollView bringSubviewToFront:_img1];