Swift - UIAlertController的簡單使用

記錄一下，方便日后查找

Demo效果如下：

UIAlertController

• 普通提示框

  let alertC = UIAlertController.init(title: "溫馨提示", message: "現(xiàn)在開始走運了", preferredStyle: .alert)
          
  alertC.addAction(UIAlertAction.init(title: "好的", style: .default, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

• 類似刪除操作提示框

  let alertC = UIAlertController.init(title: "溫馨提示", message: "確定刪除BUG嗎？", preferredStyle: .alert)
          
  alertC.addAction(UIAlertAction.init(title: "刪除", style: .destructive, handler: { (action) in
      print("刪除")
  }))
  
  alertC.addAction(UIAlertAction.init(title: "取消", style: .cancel, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

• 帶一個textField提示框

  let alertC = UIAlertController.init(title: "添加數(shù)據(jù)", message: nil, preferredStyle: .alert)
          
  //添加textField
  alertC.addTextField { (textField) in
      //這里對textField進行設(shè)置
      textField.placeholder = "請?zhí)砑觾?nèi)容"
  //            textField.backgroundColor = .green//設(shè)置背景色
  }
  
  alertC.addAction(UIAlertAction.init(title: "確定", style: .default, handler: { (action) in
      //這里獲取textField的內(nèi)容進行操作
      let text = (alertC.textFields?.first)!.text!
      print("輸入的內(nèi)容:\(text)")
  
      //也可以先實例個textField
      let textF1 = (alertC.textFields?.first)! as UITextField
      print("輸入的內(nèi)容：\(textF1.text!)")
  
  }))
  
  present(alertC, animated: true, completion: nil)
  

  獲取輸入框的內(nèi)容：(alertC.textFields?.first)!.text!

• 類似登錄帶兩個textField的提示框

  let alertC = UIAlertController.init(title: "登錄", message: nil, preferredStyle: .alert)
          
  //添加textField
  alertC.addTextField { (textField) in
      //這里對textField進行設(shè)置
      textField.placeholder = "輸入帳號"
  }
  
  alertC.addTextField { (textField) in
      //這里對textField進行設(shè)置
      textField.placeholder = "輸入密碼"
      textField.isSecureTextEntry = true//密文顯示
  }
  
  alertC.addAction(UIAlertAction.init(title: "登錄", style: .default, handler: { (action) in
      //這里獲取textField的內(nèi)容進行操作
      //輸入的帳號
      let text1 = (alertC.textFields?.first)!.text!
  
      //輸入的密碼
      let text2 = (alertC.textFields?.last)!.text!
  
      print("帳號：\(text1)\n密碼：\(text2)")
  
  }))
  
  alertC.addAction(UIAlertAction.init(title: "取消", style: .cancel, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

  • 提示框彈出后自動消失

  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: "溫馨提示", message: "你準備好了嗎？", preferredStyle: .actionSheet)
          
  alertC.addAction(UIAlertAction.init(title: "準備好了", style: .destructive, handler: { (action) in
      print("萬事俱備")
  }))
  
  alertC.addAction(UIAlertAction.init(title: "取消", style: .cancel, handler: nil))
  
  present(alertC, animated: true, completion: nil)
  

附上Demo