xcode 专注于 UITextField
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focus on UITextField
提问by Gavin
I am doing a login page, whereby if the user press the login button without filling up the username/password, an alertview will pop up. How do I focus on the textfield and bring up the keyboard accordingly after the user dismiss the alertview?
我正在做一个登录页面，如果用户在没有填写用户名/密码的情况下按下登录按钮，则会弹出一个警报视图。在用户关闭警报视图后，如何专注于文本字段并相应地调出键盘？
What is the method to call to set focus on a particular UITextField? Thanks!
调用以将焦点设置在特定 UITextField 上的方法是什么？谢谢！
回答by Mark Granoff
Make sure your UIAlertView's delegate is your view controller (self), and in the implementation of the UIAlertView delegate method alertView:clickedButtonAtIndex:, call [usernameTextField becomeFirstResponder]. Easy! (Make sure your view controller class adopts the UIAlertViewDelegateprotocol.)
确保您的 UIAlertView 的委托是您的视图控制器（自己），并且在 UIAlertView 委托方法的实现中alertView:clickedButtonAtIndex:，调用[usernameTextField becomeFirstResponder]. 简单！（确保您的视图控制器类采用该UIAlertViewDelegate协议。）
回答by taskinoor
[myTextField becomeFirstResponder];
回答by Konstantin Chugalinskiy
You should use a code [mytextField becomeFirstResponder];in your – alertView:clickedButtonAtIndex:delegate method.
您应该[mytextField becomeFirstResponder];在– alertView:clickedButtonAtIndex:委托方法中使用代码。
