防止关闭UIAlertView [英] prevent UIAlertView from dismissing

问题描述

作为一种验证形式，是否有任何方法可以防止在按下确定"按钮时关闭警报视图?

As a form of validation, is there any way to prevent an alert view from dismissing when pressing an "OK" button?

方案:我在Alertview中有2个文本字段，用于输入用户名/密码.如果两者都为空并且用户按下确定"，则我不希望该警报被取消.

Scenario: I have 2 text fields in the alertview for username/password. If both are empty and the user presses "OK", I do not want the alert to be dismissed.

推荐答案

iOS 5为UIAlertView引入了一个新属性来精确地解决此问题.

iOS 5 introduces a new property to UIAlertView to handle exactly this problem.

alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;

有关UIAlertView的Apple文档.

添加新的UIAlertViewDelegate方法来处理按钮的启用/禁用.

Add the new UIAlertViewDelegate method to handle the enabling/disabling of the button.

- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView

Apple文档在UIAlertViewDelegate上.

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