Getting UILabel to produce an ellipsis rather than shrinking the font

问题

When I dynamically change the text of a UILabel I would prefer to get an ellipsis (dot, dot, dot) rather then have the text be automatically resized. How does one do this?

In other words, if I have UILabel with the word Cat with size font 14 and then I change the word to Hippopotamus the font shrinks to fit all the word. I would rather the word be automatically truncated followed by an ellipsis.

I assume there is a parameter that can be changed within my UILabel object. I'd rather not do this programmatically.

回答1:

Set the following properties:

label.adjustsFontSizeToFitWidth = NO;
label.lineBreakMode = NSLineBreakByTruncatingTail;

You can also set these properties in interface builder.

回答2:

Swift solution:

label.lineBreakMode = .ByTruncatingTail

Swift 3:

label.lineBreakMode = .byTruncatingTail

回答3:

I had an issue producing ellipsis after I styled a UILabel and needed to use UILabel.attributedText instead of UILabel.text. There is a line break mode on the paragraph style that will overwrite the UILabel.lineBreakMode when using attributed text. You'll need to set the lineBreakMode to .byTruncatingTail on the attributed string's paragraph style if you want to achieve ellipsis.

e.g.

    let attributedString = NSMutableAttributedString(string: "example long string", attributes: [...])
    let textRange = NSRange(location: 0, length: textString.length)
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineBreakMode = .byTruncatingTail
    textString.addAttribute(.paragraphStyle, value: paragraphStyle, range: textRange)
    uiLabel.attributedText = attributedString