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swiftmacosstoryboard

Number of lines in a label and macOS

In iOS we can control the number of lines in Storyboard > Attributes > Number of lines. We can put 0 to make an undetermined number and then the label adapts to the content.

Also programatically: label1.numberOfLines = 0

I do not see an equivalent in macOS. I can option enter manually in Storyboard, if I want to create a new line. But, that does not solve the problem if the text changes dynamically.

How can make multiple lines and let a label adapt to the content in macOS?

Solution

  • You can check the following properties in the Xcode interface builder:

    • Choose 'Wraps' from Layout
    • Choose 'Character Wrap' (or Word Wrap) from Line Break
    • Option 'Uses Single Line Mode' must be unchecked

    Programatically (the key is to use the underlying cell of the NSTextField):

    let textfield: NSTextField = NSTextField(wrappingLabelWithString: "This is a very long text that requires a line break.")
textfield.frame = NSRect(x: 0.0, y: 0.0, width: 128.0, height: 96.0)
(textfield.cell as? NSTextFieldCell)?.isEditable = false
(textfield.cell as? NSTextFieldCell)?.wraps = true
(textfield.cell as? NSTextFieldCell)?.usesSingleLineMode = false
(textfield.cell as? NSTextFieldCell)?.lineBreakMode = NSLineBreakMode.byWordWrapping

self.view.addSubview(textfield)