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