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            }    }