ios - 找到UILabel的底部位置，以便可以在下面创建第二个UILabel

Question

我正在创建一篇新文章。为文章标题添加了UILabel。标题文本有时可能是一，两或三行文本。然后，我需要在标题下方创建一个UILabel。

由于标题具有动态高度，我无法定位日期UILabel。

是否有计算方法可以获取UILabel框架的底部位置？

注意:我正在使用siteToFit来确保UILabel的框架适合。

// Text
    UILabel *title = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, self.view.bounds.size.width-20, 50)];
    //title.backgroundColor = [UIColor clearColor];
    title.backgroundColor = [UIColor redColor];
    title.text = self.firstItem.title;
    //title.text = @"This is a test of a short title that is a little longer";
    title.textColor = [UIColor whiteColor];
    title.layer.shadowColor = [UIColor blackColor].CGColor;
    title.layer.shadowOffset = CGSizeMake(0, 0);
    title.layer.shadowRadius = 0.6;
    title.textAlignment = NSTextAlignmentLeft;
    title.layer.shadowOpacity = 1.0;
    title.layer.masksToBounds = NO;
    title.font = [UIFont boldSystemFontOfSize:16.0];
    title.numberOfLines = 0;
    [title sizeToFit];

    [self.firstNewsItemBackgroundView addSubview:title];
    self.cachedParalax = self.firstNewsItemBackgroundView.frame;

    // Fix positioning
    title.center = CGPointMake(title.center.x, self.imageView.frame.size.height - title.frame.size.height);

    // Date
    UILabel *titleDate = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, self.view.bounds.size.width-20, 50)];
    titleDate.backgroundColor = [UIColor clearColor];
    titleDate.text = self.firstItem.publishedDateString;
    titleDate.textColor = [UIColor whiteColor];
    titleDate.layer.shadowColor = [UIColor blackColor].CGColor;
    titleDate.layer.shadowOffset = CGSizeMake(0, 0);
    titleDate.layer.shadowRadius = 0.7;
    titleDate.textAlignment = NSTextAlignmentLeft;
    titleDate.layer.shadowOpacity = 0.95;
    titleDate.layer.masksToBounds = NO;
    titleDate.font = [UIFont italicSystemFontOfSize:12.0];
    titleDate.numberOfLines = 0;
    [title sizeToFit];
    [self.firstNewsItemBackgroundView addSubview:titleDate];

    // Fix positioning
    CGRect frame = titleDate.frame;
    titleDate.frame = CGRectMake(10, title.center.y + (title.frame.size.height/2), frame.size.width, frame.size.height);

Answer 1

好吧，看来您有错字。您正在再次调用[title sizeToFit]，而不是[titleDate sizeToFit]，这可能是问题的一部分。

至于使用10像素空格定位日期标签:

CGRect dateFrame = titleDate.frame;
dateFrame.origin.y = title.frame.origin.y + title.frame.size.height + 10; 
[titleDate setFrame:dateFrame]