swift - 为什么我得到一个 Thread 1 : EXC_BAD_ACCESS (code = EXC_I386_GPFLT)

Question

var soundPoolLabel: UILabel {
  let label = UILabel(frame: CGRect(x: 20, y: 90, width: 540, height: 94))
  label.text = "SoundPool"
  label.textColor = UIColor.black
  label.font = UIFont(name: "Bodoni 72 Oldstyle", size: 80)
  let attributedString = NSMutableAttributedString(string: label.text!)
  attributedString.addAttribute(kCTKernAttributeName as NSAttributedStringKey, value: CGFloat(1.0), range: NSRange(location: 0, length: attributedString.length))
  label.attributedText = attributedString
  return label
}

soundPoolLabel.translatesAutoresizingMaskIntoConstraints = false
let topConstraint = soundPoolLabel.topAnchor.constraint(equalTo: view.topAnchor, constant: 90)
NSLayoutConstraint.activate([topConstraint])

Answer 1

标签不应是计算属性。它应该只初始化一次。做这样的事情来解决问题。

var soundPoolLabel: UILabel = {
  let label = UILabel(frame: CGRect(x: 20, y: 90, width: 540, height: 94))
  label.text = "SoundPool"
  label.textColor = UIColor.black
  label.font = UIFont(name: "Bodoni 72 Oldstyle", size: 80)
  let attributedString = NSMutableAttributedString(string: label.text!)
  attributedString.addAttribute(kCTKernAttributeName as NSAttributedStringKey, value: CGFloat(1.0), range: NSRange(location: 0, length: attributedString.length))
  label.attributedText = attributedString
  return label
}()

这是因为每次您使用soundPoolLabel 时，它都会创建一个新实例，而不是使用同一个实例。系统在 subview 层级中找不到新的实例，抛出EXC_BAD_ACCESS错误