如何在Xcode故事板中通过自定义运行时属性设置文本属性及字符间距？

Hey there, let's tackle your two questions about User Defined Runtime Attributes in Xcode Storyboards:

Setting defaultTextAttributes via User Defined Runtime Attributes is straightforward—here's a step-by-step breakdown:

• Open your Storyboard and select the target control (this works for UILabel, UITextField, UIButton's titleLabel, and other text-based components).
• Switch to the Identity Inspector (the third tab in the right-hand panel, looks like a small ID card).
• Scroll down to the User Defined Runtime Attributes section, then click the + button to add a new attribute.
• For the key path, enter defaultTextAttributes, and set the type to Dictionary.
• Expand the dictionary by clicking the triangle next to it, then add sub-attributes for the text styles you want:
  • To set a font: Add a child attribute with key font, type NSFont, and value like System 17.0 or HelveticaNeue-Bold 16.0.
  • To set text color: Add a child attribute with key foregroundColor, type UIColor, and pick a color from the dropdown (or enter a custom one).
  • You can also add other attributes like underlineStyle (type NSNumber, value 1 for single underline) or backgroundColor (type UIColor) to customize further.

Absolutely! You can add character spacing (kern) directly through User Defined Runtime Attributes by nesting it inside the defaultTextAttributes dictionary:

• Follow the steps above to create the defaultTextAttributes dictionary for your control.
• Expand the dictionary and add a new child attribute:
  • Key: kern
  • Type: NSNumber
  • Value: Enter a numerical value (e.g., 2 for 2 points of spacing between characters; use negative numbers like -1 to tighten spacing).
• This setting will apply to all text displayed by the control—whether you set it via Storyboard or update it programmatically later (unless you explicitly override the attributed text).

A quick note for UIButton users: If you're targeting iOS versions before 15, you might need to use the key path titleLabel.defaultTextAttributes instead of just defaultTextAttributes (since UIButton's top-level defaultTextAttributes was added in iOS 15).

内容的提问来源于stack exchange，提问作者Fattie