ios - 快速代码返回警报类型字符串不起作用
<p><p>我发现 void 返回警报，但未找到字符串警报返回。
尝试将 Void 转换为字符串 </p>
<pre><code>// return Void Alert
func returnAlert(title: String!, message: String! ,success: (() -> Void)? , cancel: (() -> Void)?) {
dispatch_async(dispatch_get_main_queue(), {
let alertController = UIAlertController(title:title,
message: "",
preferredStyle: UIAlertControllerStyle.Alert)
self.newQtyField = UITextField()
self.newQtyField.keyboardType = .NumberPad
func addTextField(textField: UITextField!){
// add the text field and make the result global
let row = self.array
textField.text = String(row.pbQty!)
self.newQtyField = textField
}
let cancelLocalized = NSLocalizedString("cancel", tableName: "activity", comment:"")
let okLocalized = NSLocalizedString("ok", tableName: "Localizable", comment:"")
let cancelAction: UIAlertAction = UIAlertAction(title: cancelLocalized,
style: .Cancel) {
action -> Void in cancel?()
}
let successAction: UIAlertAction = UIAlertAction(title: okLocalized,
style: .Default) {
action -> Void in success?()
}
alertController.addTextFieldWithConfigurationHandler(addTextField)
alertController.addAction(cancelAction)
alertController.addAction(successAction)
self.presentViewController(alertController, animated: true, completion: nil)
})
}
</code></pre>
<p>//底部调用乐趣 |我认为成功:{ () to success: { textfield , but not working how...需要你的帮助</p>
<pre><code> returnAlert("title", message: "msg", success: { () -> Void in
})
{ () -> Void in
print("user canceled")
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>很难理解您在问题中所说的内容。</p>
<p>你应该把方法定义改成这样:</p>
<pre><code>func returnAlert(title: String!, message: String! ,success: ((text:String) -> Void)? , cancel: (() -> Void)?) {
</code></pre>
<p>并更改 <code>successAction</code> 以返回 UITextField 的值:</p>
<pre><code>let successAction: UIAlertAction = UIAlertAction(title: okLocalized,
style: .Default) { action in
success?(text: self.newQtyField.text!)
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 快速代码返回警报类型字符串不起作用，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/38517119/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/38517119/
</a>
</p>
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