ios - iOS7 中的警报 View

Question

我是 iOS 和 Objective C 的新手。我有以下代码可以在 iOS7 中为 iPhone 应用程序创建警报 View :

if ([tracker exceededGoal]){
    [UIAlertView] *alert = [[UIAlertView alloc] initWithTitle:@"Done" message:@"You acheived your goal!" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];
[alert show];
[alert release];

}

我收到以下错误:

Use of Undeclared identifier 'alert'

Expected identifier

我做错了什么？

Answer 1

去掉这里的括号:UIAlertView *alert =