[教學] Swift Alert 範例

Swift
// 建立一個提示框

let alertController = UIAlertController(
    title: "提示",
    message: "請輸入價格或數量",
    preferredStyle: .alert)

// 建立[確認]按鈕
let okAction = UIAlertAction(
    title: "確認",
    style: .default,
    handler: {
        (action: UIAlertAction!) -> Void in
        print("按下確認後的動作")
})
alertController.addAction(okAction)

// 顯示提示框
self.present(
    alertController,
    animated: true,
    completion: nil)