Swift - UIAlertController的简单使用

记录一下，方便日后查找

Demo效果如下：

• 普通提示框

  let alertC = UIAlertController.init(title: "温馨提示", message: "现在开始走运了", preferredStyle: .alert)
          
  alertC.addAction(UIAlertAction.init(title: "好的", style: .default, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

• 类似删除操作提示框

  let alertC = UIAlertController.init(title: "温馨提示", message: "确定删除BUG吗？", preferredStyle: .alert)
          
  alertC.addAction(UIAlertAction.init(title: "删除", style: .destructive, handler: { (action) in
      print("删除")
  }))
  
  alertC.addAction(UIAlertAction.init(title: "取消", style: .cancel, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

• 带一个textField提示框

  let alertC = UIAlertController.init(title: "添加数据", message: nil, preferredStyle: .alert)
          
  //添加textField
  alertC.addTextField { (textField) in
      //这里对textField进行设置
      textField.placeholder = "请添加内容"
  //            textField.backgroundColor = .green//设置背景色
  }
  
  alertC.addAction(UIAlertAction.init(title: "确定", style: .default, handler: { (action) in
      //这里获取textField的内容进行操作
      let text = (alertC.textFields?.first)!.text!
      print("输入的内容:\(text)")
  
      //也可以先实例个textField
      let textF1 = (alertC.textFields?.first)! as UITextField
      print("输入的内容：\(textF1.text!)")
  
  }))
  
  present(alertC, animated: true, completion: nil)
  

  获取输入框的内容：(alertC.textFields?.first)!.text!

• 类似登录带两个textField的提示框

  let alertC = UIAlertController.init(title: "登录", message: nil, preferredStyle: .alert)
          
  //添加textField
  alertC.addTextField { (textField) in
      //这里对textField进行设置
      textField.placeholder = "输入帐号"
  }
  
  alertC.addTextField { (textField) in
      //这里对textField进行设置
      textField.placeholder = "输入密码"
      textField.isSecureTextEntry = true//密文显示
  }
  
  alertC.addAction(UIAlertAction.init(title: "登录", style: .default, handler: { (action) in
      //这里获取textField的内容进行操作
      //输入的帐号
      let text1 = (alertC.textFields?.first)!.text!
  
      //输入的密码
      let text2 = (alertC.textFields?.last)!.text!
  
      print("帐号：\(text1)\n密码：\(text2)")
  
  }))
  
  alertC.addAction(UIAlertAction.init(title: "取消", style: .cancel, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

  • 提示框弹出后自动消失

  let alertC = UIAlertController.init(title: "成功", message: nil, preferredStyle: .alert)
          
  present(alertC, animated: true, completion: nil)
  
  //3秒后提示框消失
  DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 3) {
      //提示框消失
      alertC.dismiss(animated: true, completion: nil)
  }
  

• ActionSheet

  let alertC = UIAlertController.init(title: "温馨提示", message: "你准备好了吗？", preferredStyle: .actionSheet)
          
  alertC.addAction(UIAlertAction.init(title: "准备好了", style: .destructive, handler: { (action) in
      print("万事俱备")
  }))
  
  alertC.addAction(UIAlertAction.init(title: "取消", style: .cancel, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

附上Demo