以編程方式取消警報Swift

我需要一個UIAlert的幫助。我收到一個錯誤"UIAlertController can only have one action with a style of UIAlertActionStyleCancel"。我知道這是因爲我在該功能之外啓動了此警報，但不確定如何解決該警報。如何在if條件下訪問警報？以編程方式取消警報Swift

let alertView = UIAlertController(title: "Blah", message: "", preferredStyle: UIAlertControllerStyle.Alert) 
@IBAction func blahButtonPressed(sender: AnyObject) {   

     alertView.addAction(UIAlertAction(title: "Do Something", style: .Default, handler: { (action: UIAlertAction!) in 
      // I have code here 
     })) 

     alertView.addAction(UIAlertAction(title: "Do Something 2", style: .Default, handler: { (action: UIAlertAction!) in 
      // I have code here 
     })) 

     alertView.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action: UIAlertAction!) in 
      // I have code here 
     })) 

     presentViewController(alertView, animated: true, completion: nil) 

}

代碼後來我通過藍牙獲取值，需要解除警報，如果值低於80

if blah < 80 { 
alertView.dismissViewControllerAnimated(true, completion: nil) 
}

來源

2016-06-09 Andrew Garcia

blahButtonPressed被執行了多次？錯誤消息聽起來像你添加「取消」多次。 –

不，只是一個按鈕。我只按一次，而不是在其他地方打電話。 – KotaBear233

這是我如何固定它，如果有人來翻過這一點。

var newAlert: AnyObject? 


@IBAction func blahButtonPressed(sender: AnyObject) {   
    let alertView = UIAlertController(title: "Blah", message: "", preferredStyle: UIAlertControllerStyle.Alert) 
    alertView.addAction(UIAlertAction(title: "Do Something", style: .Default, handler: { (action: UIAlertAction!) in 
     // I have code here 
    })) 

    alertView.addAction(UIAlertAction(title: "Do Something 2", style: .Default, handler: { (action: UIAlertAction!) in 
     // I have code here 
    })) 

    alertView.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action: UIAlertAction!) in 
     // I have code here 
    })) 

    newAlert = alertView 

     presentViewController(alertView, animated: true, completion: nil) 
}

//當我需要關閉。如果等於低於80

if blah < 80 { 
    if let newAlertView = newAlert as? UIAlertController { 
     newAlertView.dismissViewControllerAnimated(true, completion: nil) 
    } 
}

來源

2016-06-09 20:43:28 KotaBear233

我不是100％，但是當你只按一下按鈕時它是否工作？如果是這樣，那麼可能是因爲您在@IBAction內將操作添加到alertView。相反，您可能想要嘗試在@IBAction之外移動UIAlertAction的其他內容，並僅在其內部顯示警報視圖。像這樣：

let alertView = UIAlertController(title: "Blah", message: "", preferredStyle: UIAlertControllerStyle.Alert) 
alertView.addAction(UIAlertAction(title: "Do Something", style: .Default, handler: { (action: UIAlertAction!) in 
     // I have code here 
    })) 

alertView.addAction(UIAlertAction(title: "Do Something 2", style: .Default, handler: { (action: UIAlertAction!) in 
     // I have code here 
    })) 

alertView.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action: UIAlertAction!) in 
     // I have code here 
    })) 

@IBAction func blahButtonPressed(sender: AnyObject) { 
    presentViewController(alertView, animated: true, completion: nil) 
}

這樣，UIAlertAction的沒有得到添加了‘blahButton’被按下，每一次（這將導致多個UIAlertAction與‘UIAlertActionStyleCancel’的風格）

來源

2016-06-09 20:43:52 Ike10

以編程方式取消警報Swift

回答

相關問題