objective-c - 帮助解决编译器警告 : Initialization from distinct Objective-C type when types match

Question

这是我收到编译器警告的函数，我似乎无法弄清楚是什么导致了它。如有任何帮助，我们将不胜感激。

 -(void)displaySelector{
    //warning on the following line:
    InstanceSelectorViewController *controller = [[InstanceSelectorViewController alloc] initWithCreator:self];
    [self.navController pushViewController:controller animated:YES];
    [controller release];
}

initWithCreator: 方法的接口(interface)和实现

-(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)creator;


-(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)crt{
    if (self = [self initWithNibName:@"InstanceSelectorViewController" bundle:nil]) {
        creator = crt;
    }
    return self;
}

Answer 1

我猜这不是您的项目中唯一具有 initWithCreator: 方法的类。一般来说，为 init 方法提供静态类型是一个坏主意。 alloc 返回 id，因此编译器不知道您向其发送 init 方法的对象的类型。如果有多个选择，它通常会猜测错误，并且您会收到所看到的警告。