表达结果在iOS UIAlertView中未使用

Question

我仍然是iOS的新手,我有点卡住创建一个结合常规文本和变量的警报视图.我在initWithTitle行上收到"表达式结果未使用"警告,我不知道如何修复它.

name = @"foo";

//now create the alert
UIAlertView *myAlert = [[UIAlertView alloc]
                        initWithTitle: (@"Hello %@", name)
                        message: @"You're looking mighty fine today"
                        delegate: nil
                        cancelButtonTitle: @"I'm awesome"
                        otherButtonTitles: nil];

//show the alert
[myAlert show];

现在,有了警告,一切都会编译,但我的警报标题只是"foo"而不是"hello foo".

如果我删除括号,我会在下一行收到语法错误.

Answer 1

创建标题如下:

UIAlertView *myAlert = [[UIAlertView alloc]
                    initWithTitle: [NSString stringWithFormat:@"Hello %@",name]
                    message: @"You're looking mighty fine today"
                    delegate: nil
                    cancelButtonTitle: @"I'm awesome"
                    otherButtonTitles: nil];