如何截断UILabel中字符串中的字符串？ [英] How do I truncate a string within a string in a UILabel?

问题描述

说我有黑暗骑士在下午7:45升起我需要将它装入固定宽度的UILabel（适用于iPhone）。我怎么能把截断作为黑暗骑士Ris ......在晚上7:45，而不是黑暗骑士在7：4升起......？

Say I have The Dark Knight Rises at 7:45pm and I need to fit that into a fixed-width UILabel (for iPhone). How would I make that truncate as "The Dark Knight Ris... at 7:45pm" rather than "The Dark Knight Rises at 7:4..."?

推荐答案

UILabel有这个属性：

UILabel has this property:

@property(nonatomic) NSLineBreakMode lineBreakMode;

您可以通过将其设置为NSLineBreakByTruncatingMiddle来启用该行为。

You enable that behaviour by setting it to NSLineBreakByTruncatingMiddle.

编辑

我不明白你只想截断一个字符串的一部分。然后阅读：

I din't understand that you wanted to truncate only a part of the string.Then read this:

如果要将换行模式仅应用于文本的一部分，请创建一个具有所需样式信息的新属性字符串，并将其与标签相关联。如果您没有使用样式文本，则此属性适用于text属性中的整个文本字符串。

If you want to apply the line break mode to only a portion of the text, create a new attributed string with the desired style information and associate it with the label. If you are not using styled text, this property applies to the entire text string in the text property.

示例

因此甚至还有一个用于设置段落样式的类：NSParagraphStyle，它也有可变版本。

所以让我们说你有一个你想要应用该属性的范围：

So there is even a class for setting the paragraph style: NSParagraphStyle and it has also it's mutable version.
So let's say that you have a range where you want to apply that attribute:

NSRange range=NSMakeRange(i,j);

你必须创建一个NSMutableParagraphStyle对象并将它的lineBreakMode设置为NSLineBreakByTruncatingMiddle.Notice，你也可以设置它很多其他参数。所以我们这样做：

You have to create a NSMutableParagraphStyle object and set it's lineBreakMode to NSLineBreakByTruncatingMiddle.Notice that you may set also a lot of other parameters.So let's do that:

NSMutableParagraphStyle* style= [NSMutableParagraphStyle new];
style.lineBreakMode= NSLineBreakByTruncatingMiddle;

然后为该范围内标签的attributedText添加该属性.intribiveText属性是NSAttributedString，而不是NSMutableAttributedString，因此您必须创建一个NSMutableAttributedString并将其分配给该属性：

Then add that attribute for the attributedText of the label in that range.The attributedText property is a NSAttributedString, and not a NSMutableAttributedString, so you'll have to create a NSMutableAttributedString and assign it to that property:

NSMutableAttributedString* str=[[NSMutableAttributedString alloc]initWithString: self.label.text];
[str addAttribute: NSParagraphStyleAttributeName value: style range: range];
self.label.attributedText= str;

请注意，NSAttributedString还有很多其他属性，请检查这里。

Notice that there are a lot of other properties for a NSAttributedString, check here.

这篇关于如何截断UILabel中字符串中的字符串？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！