Question

我想传递第一个视图中的视图，就像在这里一样

        if (self.bookDetailViewController == nil)
            {
        iPhoneStreamingPlayerViewController *aBookDetail = [[iPhoneStreamingPlayerViewController alloc] initWithNibName:@"iPhoneStreamingPlayerView" bundle:nil];
        self.bookDetailViewController = aBookDetail;
        NSLog(@"View initilaized");
        [aBookDetail release];


    }


    //call a method from another class like over here 
     [booksNavController1 nowPlayingView:bookDetailViewController];


     //in 2nd view controller 

    -(void)nowPlayingView:(iPhoneStreamingPlayerViewController *)NPView
   {

    nowPlayingSong = NPView;


    }


    -(void)getSng:(NSString *)sng
     {
     name = sng;

     }


    //ibacton for toolbar button 


    -(IBAction)nowPlaying
    { 


    Music_appAppDelegate *delegate = [[UIApplication sharedApplication]delegate];
        [delegate.booksNavController pushViewController:nowPlayingSong animated:YES];
    }

这是什么是nsloged“应用程序试图在目标上推送一个nil视图控制器。终止以响应SpringBoard的终止。“

Answer 1

不要发布aBookDetail。即注释掉这一行：

    [aBookDetail release];

试一试，看看它是否有效。

Answer 2

您必须对程序进行不同的构建。你得到null的原因是你的类在打印输出之前执行。

Parser *parserClass = [Parser new];
parserClass.array = [[NSArray alloc]initWithObjects:@"One",@"Two", nil];
NSLog(@"%@", parserClass.array);

很抱歉，你必须以不同的方式构建你的课程。

或者你可以使用(AppDelegate *)[[UIApplication sharedApplication]delegate];来允许在类和AppDelegate之间共享，然后相应地进行子类化。

如何将一个对象从类传递给另一个？ - 从一个班级到另一个班级的观点？

2 个答案: