iOS7实现带文本输入框的UIAlertView及获取TextField文本内容

if (customAlertView==nil) {
    customAlertView = [[UIAlertView alloc] initWithTitle:@"自定义服务器地址" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil nil];
}
[customAlertView setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];  
UITextField *nameField = [customAlertView textFieldAtIndex:0];
nameField.placeholder = @"请输入一个名称";  
UITextField *urlField = [customAlertView textFieldAtIndex:1];
[urlField setSecureTextEntry:NO];
urlField.placeholder = @"请输入一个URL";
urlField.text = @"http://";  
[customAlertView show];  
实现UIAlertViewDelegate
在CODE上查看代码片派生到我的代码片
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{  
    if (buttonIndex == alertView.firstOtherButtonIndex) {
        UITextField *nameField = [alertView textFieldAtIndex:0];
        UITextField *urlField = [alertView textFieldAtIndex:1];
        //TODO
    }
}  

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效果图: