UILabel 中的行数

发布于 2024-09-24 23:43:32 字数 346 浏览 0 评论 0原文

我需要获取 UILabel 中的行数，以便我可以将另一个 UILabel 移动到最后一行文本的底部。我已经做到了：

int lines = [cellDetailTextLabel.text sizeWithFont:cellDetailTextLabel.font constrainedToSize:cellDetailTextLabel.frame.size lineBreakMode:UILineBreakModeWordWrap].height /16;

但它并不完美，因为在某些情况下，UILabel 的长度为 3 行，但上面的代码只返回 2，但并非所有 3 行 UILabel 都是这种情况。

原文

I need to get the number of lines in a UILabel, so that I can move another UILabel to be at the bottom of the last line of text.
I have done:

int lines = [cellDetailTextLabel.text sizeWithFont:cellDetailTextLabel.font constrainedToSize:cellDetailTextLabel.frame.size lineBreakMode:UILineBreakModeWordWrap].height /16;

but well it's not perfect because there are some cases when the UILabel is 3 lines long but the above code only returns 2, but this is not the case for all 3 lines of UILabels.

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墨小沫ゞ 2024-10-01 23:43:32

最好将 UILabel 的文本布局视为黑盒（它可以做一些有趣的事情，例如当文本太长时自动调整字体大小）。

相反，请考虑使用 UIView 大小调整方法：

// Ask the label to shrink (or grow) until it fits its text:
[cellDetailTextLabel sizeToFit];
// Get the frame.
CGRect r = cellDetailTextLabel.frame;
// Move its origin to below cellDetailTextLabel
r.origin.y = CGRectGetMaxY(r);
// Set its size to the size of the second label
r.size = cellLabel2.frame.size;
// Finally, move the second label
cellLabel2.frame = r;

我注意到 iPhone 4 上的文本大小调整有一些奇怪的行为（有时标签会出现太高的额外行）；我不确定这个问题是否在 4.1 中得到修复。

It's better to treat UILabel's text layout as a black box (it does fun things like auto-adjusting font size when the text gets too long).

Instead, consider using UIView sizing methods:

// Ask the label to shrink (or grow) until it fits its text:
[cellDetailTextLabel sizeToFit];
// Get the frame.
CGRect r = cellDetailTextLabel.frame;
// Move its origin to below cellDetailTextLabel
r.origin.y = CGRectGetMaxY(r);
// Set its size to the size of the second label
r.size = cellLabel2.frame.size;
// Finally, move the second label
cellLabel2.frame = r;

I've noticed some odd behaviour with text-sizing on iPhone 4 (occasionally labels are an extra line too high or so); I'm not sure if this is fixed in 4.1.

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