iOS 文本提示框封装

weixin_33701564

于 2018-01-23 03:12:48 发布

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CC 4.0 BY-SA版权

文章标签： python

原文链接：https://juejin.im/post/5a65deb1f265da3e3b7aa60a

Github完整版Demo 包括点击任意地方立即移除等

效果

简单几行代码大家自己看吧。

代码

class JSAlertLabel: UILabel {

  let screenWidth = UIScreen.main.bounds.width
  let screenHeight = UIScreen.main.bounds.height

  override init(frame: CGRect) {
      super.init(frame: frame)
      setup()
  }

  required init?(coder aDecoder: NSCoder) {
      fatalError("init(coder:) has not been implemented")
  }
  private func setup() {
      backgroundColor = UIColor.black
      alpha = 0
      layer.cornerRadius = 2.5
      numberOfLines = 1
      textAlignment = .center
  }
  
  /** 出现动画0.2秒 消失动画0.3秒 呈现在屏幕上的时间=delay。最大长度屏幕宽度/2 高度20
 */
  public func show(text: String, onView view: UIView, removeAfter delay: Double) {
      attributedText = NSAttributedString(string: text, attributes: [NSAttributedStringKey.foregroundColor : UIColor.white, NSAttributedStringKey.font: UIFont.systemFont(ofSize: 15)])
    
      view.addSubview(self)
      UIView.animate(withDuration: 0.2, delay: 0, options: [], animations: {
          self.alpha = 0.6
      }) { (_) in
          UIView.animate(withDuration: 0.3, delay: delay, options: [], animations: {
              self.alpha = 0
          }) { (_) in
              self.removeFromSuperview()
          }
      }
    
    
    }
}
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