UIImageview 被添加到另一个子视图 UIScrollview 后不显示

Question

我只在代码中创建视图控制器，没有 .xib 或情节提要。 我在视图中添加了许多其他子视图，它们是在 (void)loadView 方法中添加的，它们的框架在 (id)init 方法中初始化，如下所示

-(id)init{ 

   bottomClinkRect = CGRectMake(playersBoardRect.origin.x + (playersBoardWidth * 0.320),
                                playersBoardRect.origin.y + playersBoardHeight - playerBottomImageRect.size.height -  (playersBoardHeight * 0.038),
                                playersBoardWidth * 0.680,
                                playersBoardHeight * 0.038);
}
- (void)loadView {

   bottomClink = [[UIScrollView alloc]initWithFrame:bottomClinkRect];
   [bottomClink setScrollEnabled:YES];
   bottomClink.contentSize = CGSizeMake(bottomClink.frame.size.height,bottomClink.frame.size.height);
   [contentView addSubview:bottomClink];
}

我创建了空的滚动视图，然后根据屏幕上的用户操作，我尝试使用以下方法每次将一个 imageView 添加到滚动视图：

-(void)reloadCollections:(NSNotification *)notification
{
    UIImage *latestPieceCaptured = [gameController capturedBlackPiecesImages].lastObject;

    [whitePlayerCaptures addObject:latestPieceCaptured];

    NSInteger newNumberOfViews = whitePlayerCaptures.count;

    CGFloat xOrigin = (newNumberOfViews - 1) * bottomClink.frame.size.height;

    CGRect imageRect = CGRectMake(bottomClink.frame.origin.x + xOrigin,
                                  bottomClink.frame.origin.y,
                                  bottomClink.frame.size.height, //the width is taken from the height
                                  bottomClink.frame.size.height); // the height

    UIImageView *image = [[UIImageView alloc] initWithFrame:imageRect];
    image.backgroundColor = [UIColor blackColor];
    image.image = latestPieceCaptured;
    image.contentMode = UIViewContentModeScaleAspectFit;

    //set the scroll view content size
    bottomClink.contentSize = CGSizeMake(bottomClink.frame.size.height * newNumberOfViews,
                                         bottomClink.frame.size.height);

    [bottomClink  addSubview:image];
}

我的问题是 scrollview 被添加到主 view 但 imageview(s) 没有出现。

我已经对其进行了调试，scrollview 添加了子视图，它们具有帧大小等所有内容，但未显示在屏幕上。我尝试了很多变化，但到目前为止没有任何效果。

提前感谢您提供任何链接或建议。

Answer 1

这对我有用：

- (void)addImagesToScrollView {

    [self.scrollViewOutlet setAlwaysBounceVertical:NO];

    _scrollViewOutlet.delegate = self;

    for (int i = 0; i < thumbnailPreview.count; i++) {
        CGFloat xOrigin = i * self.scrollViewOutlet.frame.size.width;
        UIImageView *image = [[UIImageView alloc] initWithFrame:
                              CGRectMake(xOrigin, 0,
                                         self.scrollViewOutlet.frame.size.width,
                                         self.scrollViewOutlet.frame.size.height)];
        image.image = [UIImage imageNamed: [thumbnailPreview objectAtIndex:i]];

            image.contentMode = UIViewContentModeScaleAspectFill;


       image.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;


        image.clipsToBounds = YES;

        [self.scrollViewOutlet addSubview:image];
    }
    //set the scroll view content size
    self.scrollViewOutlet.contentSize = CGSizeMake(self.scrollViewOutlet.frame.size.width *
                                                   thumbnailPreview.count,
                                                   self.scrollViewOutlet.frame.size.height);

}

然后调用它

- (void)viewDidAppear:(BOOL)animated