iOS UIAlertView添加输入框

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"新建文件夹" message:@"" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
    [alert setAlertViewStyle:UIAlertViewStylePlainTextInput];
    UITextField *txtName = [alert textFieldAtIndex:0];
    txtName.placeholder = @"请输入名称";
    [alert show];

#pragma mark - 点击代理
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 1) {
        UITextField *txt = [alertView textFieldAtIndex:0];
        ／／获取txt内容即可
        
    }

    
}