XCode 9按钮文本放大修复及背景替代控件咨询

Hey there! Let's break down your two problems and fix them step by step.

1. Replacing Blank Buttons for Background Effects #

Using empty UIButtons as backgrounds works, but there are lighter, more straightforward options that cut down on unnecessary button overhead:

• Use a UIView as the background container
  This is my go-to pick. Create a UIView, set its background color, corner radius, and any shadow you need, then nest your interactive buttons on top of it. UIView doesn’t have the extra touch-handling logic that UIButton includes, so you won’t risk triggering unwanted actions by accident. Example code:

  let backgroundView = UIView(frame: CGRect(x: 20, y: 100, width: 300, height: 50))
  backgroundView.backgroundColor = .lightGray
  backgroundView.layer.cornerRadius = 8
  backgroundView.clipsToBounds = true
  
  // Add your functional button on top
  let actionButton = UIButton(type: .system)
  actionButton.setTitle("Tap Me", for: .normal)
  actionButton.frame = backgroundView.bounds
  backgroundView.addSubview(actionButton)
  
  view.addSubview(backgroundView)
  

• Style your interactive buttons directly
  Skip the background button entirely! Apply the background color and corner radius straight to your functional button’s layer. This keeps your view hierarchy cleaner, and you can easily set different backgrounds for each button individually:

  let button1 = UIButton(type: .system)
  button1.setTitle("Button 1", for: .normal)
  button1.backgroundColor = .blue
  button1.layer.cornerRadius = 8
  button1.clipsToBounds = true
  // Set constraints or frame as needed
  
  let button2 = UIButton(type: .system)
  button2.setTitle("Button 2", for: .normal)
  button2.backgroundColor = .green
  button2.layer.cornerRadius = 8
  button2.clipsToBounds = true
  

• Use background images (for gradients/complex visuals)
  If your background isn’t a solid color, generate a UIImage with the desired background and corner radius, then set it as the button’s backgroundImage for all states. You can create this image programmatically for dynamic changes instead of relying on asset files.

2. Fixing Button Text Enlargement (While Keeping Rounded Corners) #

Unexpected text scaling usually boils down to font settings or auto-scaling behavior. Try these fixes:

• Disable automatic font scaling
  Check if your button’s title label has adjustsFontSizeToFitWidth enabled. While this normally shrinks text to fit, misconfigured minimum font sizes or conflicting settings can cause unexpected enlargement. Lock it in explicitly:

  button.titleLabel?.adjustsFontSizeToFitWidth = false
  button.titleLabel?.minimumScaleFactor = 1.0 // Keep text at original size
  

• Use a fixed font size (avoid dynamic fonts)
  If you’re using dynamic fonts (like UIFont.preferredFont(forTextStyle:)), text will scale with the user’s system font size settings. To keep it fixed, use a static font:

  button.titleLabel?.font = UIFont.systemFont(ofSize: 16, weight: .regular)
  

• Double-check Auto Layout constraints
  Make sure your button’s width isn’t being compressed too tightly. If the button is forced into a narrow space, combined with certain content modes, it might trigger text scaling (though this is less common). Ensure your constraints give the button enough room to display text without squeezing it.

• Verify no runtime code overrides the font
  Search your project for any code that modifies the button’s title label font after you’ve set it. Helper functions or state changes can accidentally overwrite your font settings without you noticing.

And a quick reminder: when setting corner radius, always pair layer.cornerRadius with clipsToBounds = true (or layer.masksToBounds = true) to make sure the rounded corners apply to both the background and the text/content inside the button.

内容的提问来源于stack exchange，提问作者MoonMan