iphone - UIViewController中的"[CALayer release]: message sent to deallocated instance"

Question

我在 UIViewController 中有一个 MapView。当我尝试在 viewDidUnload 之后加载 View 时，它崩溃并显示以下消息:

-[CALayer release]:消息发送到已释放的实例 0x29aea0

我认为我在 viewDidUnload 中做了所有我应该做的必要的事情:

- (void)viewDidUnload {

    [super viewDidUnload];

    locationManager.delegate = nil;
    [locationManager release];
    locationManager = nil;

    mapView.delegate = nil;
    [mapView release];
    mapView = nil;
}

我的 MapView 位于 xib 文件中配置的 UIView 中。我的 VC 从未被释放。

我已经在谷歌上搜索了一段时间，但找不到答案。

编辑

 - (void)viewDidLoad {

    [super viewDidLoad];

    locationManager = [[CLLocationManager alloc] init];
    [locationManager setDelegate:self];
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    [locationManager startUpdatingLocation];

    [label setFont:[UIFont fontWithName:@"Sansation" size:28]];
    [label setShadowOffset:CGSizeMake(0, 1)];
    [label setShadowColor:[UIColor grayColor]];
    self.navigationItem.titleView = labelView;
    [label release];
    [labelView release];

    UIBarButtonItem *checkInButton = [[UIBarButtonItem alloc] initWithTitle:@"Checka In" style:UIBarButtonItemStylePlain target:self action:@selector(checkIn)];
    [[self navigationItem] setRightBarButtonItem:checkInButton];
    [checkInButton release];

    UIBarButtonItem *clueListButton = [[UIBarButtonItem alloc] initWithTitle:@"Ledtrådar" style:UIBarButtonItemStylePlain target:self action:@selector(cluesDown)];
    [[self navigationItem] setLeftBarButtonItem:clueListButton];
    [clueListButton release];

    UINavigationBar *bar = [self.navigationController navigationBar]; 
    [bar setTintColor:[UIColor colorWithRed:0.06 green:0.58 blue:0.88 alpha:1]]; 
}

“labelView”和“label”是IBOutlet。

Answer 1

由于您在 viewDidLoad 方法中既没有分配也没有保留 label 和 labelView，所以您不能在这里释放它们(您过度释放了它们) .