didReceiveMemoryWarning故障

Question

我的didReceiveMemoryWarning中应该有什么？我看不到仍在内存中的任何我可以释放的东西。我为我的managedObjectContext设置了一个属性，这就是为ivars设置的属性。

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIBarButtonItem *calendar = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"calendar.png"]style:UIBarButtonItemStyleBordered target:self action:@selector(viewCal)];
    self.navigationItem.rightBarButtonItem = calendar;
    [calendar release];

    UIBarButtonItem *settings = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"gears.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(viewSettings)];
    self.navigationItem.leftBarButtonItem = settings;
    [settings release];

    [SHK flushOfflineQueue];
    [self clearNullWorkouts];
}


- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Relinquish ownership any cached data, images, etc that aren't in use.
}

Answer 1

在SHK是什么让你成为flushOfflineQueue，clearNullWorkouts是做什么的？这些可能是您在didReceiveMemoryWarning期间需要释放的资源类型。同样，因为didReceiveMemoryWarning触发并不意味着您必须清理任何东西，例如，如果您仍在显示视图，播放正在引用的音频文件，等等。当这个调用时，您需要释放一些东西，如未显示的图像，未正在播放的音频等。在调用didReceiveMemoryWarning之后，未显示的视图控制器将调用viewDidUnload，这就是您将所有IBOutlet/编程视图设置为空并释放更多内存的地方。苹果在Memory Management Programming Guide中讨论了这一点。