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