UIAlertController UITextField

最新推荐文章于 2023-05-29 21:08:26 发布

原创最新推荐文章于 2023-05-29 21:08:26 发布 · 751 阅读

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本文展示了如何使用UIAlertController创建一个包含UITextField的提示框，并监听UITextField的文本变化，实现实时输入验证，确保用户名长度在1到10个字符之间。

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-(void)alterUsername
{
    /**
     *  弹出提示框
     */
    //初始化提示框
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"给自己起个特别的昵称吧！" message:nil preferredStyle:UIAlertControllerStyleAlert];
    [alert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        
        textField.text = self.lblUsername.text;
        
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(alertTextFieldDidChange:) name:UITextFieldTextDidChangeNotification object:textField];
        
    }];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action){
        NSLog(@"alterUsername");
    }]];
    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
    [self presentViewController:alert animated:YES completion:nil];
}


- (void)alertTextFieldDidChange:(NSNotification *)notification{
    
    UIAlertController *alertController = (UIAlertController *)self.presentedViewController;
    
    if (alertController) {
        
        UITextField *login = alertController.textFields.firstObject;
        
        UIAlertAction *okAction = alertController.actions.firstObject;
        
        
        for (UIAlertAction *okAction in alertController.actions) {
            NSLog(@"%@",okAction);
        }
        
        okAction.enabled  = login.text.length >= 1  && login.text.length <= 10;
        
    }
    
}