ios - 无法让 UILabels 出现在动态创建的 UIViews 上

Question

尝试做一些相当简单的事情。我正在创建一行放置在水平滚动 UIScrollView 中的矩形。矩形布局完美。但是，每个矩形上都有一个 UILabel。仅显示第一个标签。其他人都不是。此处的红色矩形是基本的 CGRect。黄色是我调试标签是否正确绘制的。如您所见，仅显示第一个标签:

self.dayButtonsArray = [[NSMutableArray alloc] initWithCapacity:21];

CGFloat buttonSpacing = 2.0f;
CGFloat buttonWidth = 50.0f;
CGFloat buttonHeight = self.contentView.frame.size.height;
CGFloat startX = self.contentView.frame.origin.x;
CGFloat thisX = startX;

for (int i=0; i<21; i++) {

    CGRect frame = CGRectMake(thisX, self.contentView.frame.origin.y, buttonWidth, buttonHeight);
    UIView *thisButton = [[UIView alloc] initWithFrame:frame];

    // set up a label for each view
    UILabel *label = [[UILabel alloc] initWithFrame:frame];
    [label setTextColor:[UIColor blackColor]];
    label.font = [UIFont fontWithName:DEFAULT_FONT size:14];
    label.textAlignment = NSTextAlignmentCenter;
    [label setText:[NSString stringWithFormat:@"DAY %d", i+1]];
    [labelsArray addObject:label];

    [thisButton setBackgroundColor:[UIColor redColor]];

    // now add these elements
    [thisButton addSubview:label];
    [thisButton bringSubviewToFront:label];
    [self.contentView addSubview:thisButton];
    [self.contentView bringSubviewToFront:thisButton];
    [self.dayButtonsArray addObject:thisButton];

    CGRect contentSize = self.contentView.frame;
    contentSize.size.width = ((i+1) * buttonWidth) + (i * buttonSpacing);
    self.contentView.frame = contentSize;

    thisX += buttonWidth + buttonSpacing;
}

Answer 1

您对 UIView 和 UILabel 使用相同的 frame。

CGRect frame = CGRectMake(thisX, self.contentView.frame.origin.y, buttonWidth, buttonHeight);
UIView *thisButton = [[UIView alloc] initWithFrame:frame];

// set up a label for each view
UILabel *label = [[UILabel alloc] initWithFrame:frame]; <-- this frame should have an origin.x of 0.0

label 的 x 原点应引用 thisButton 进行调整，因为您要将其添加为其 subview 。