MKMapView 从 main.m 中的 autorealease 泄漏

Posted 2023-03-05

【中文标题】MKMapView 从 main.m 中的 autorealease 泄漏

【英文标题】：MKMapView leaking from autorealease in main.m

【发布时间】：2011-04-09 08:40:30

【问题描述】：

我从这个论坛知道这是一个已向 Apple 报告的已知错误，但我担心每次调用视图时内存泄漏都会不断增加。

相关代码是

-(IBAction)getlocationgo:(id) sender
    //NSAutoreleasePool *pool;
    //pool = [[NSAutoreleasePool alloc] init];
    self.locationManager=[[[CLLocationManager alloc]init]autorelease];
    self.locationManager.delegate = self;
    [locationManager startUpdatingLocation];
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;


    //mapView.showsUserLocation =YES;
    //[pool release];




- (void)locationManager:(CLLocationManager*)aManager didFailWithError:(NSError*)anError

    switch([anError code])
    
        case kCLErrorLocationUnknown: // location is currently unknown, but CL will keep trying
            break;

        case kCLErrorDenied: // CL access has been denied (eg, user declined location use)
            UIAlertView *alert = [[UIAlertView alloc]
                                  initWithTitle:@"Location Error"
                                  message:@"Please enable Location Services in the Settings menu"
                                  delegate:nil
                                  cancelButtonTitle:@"OK"
                                  otherButtonTitles:nil];
             AudioservicesPlayAlertSound(kSystemSoundID_Vibrate);

            [alert show];
            [alert release];
            break;

        case kCLErrorNetwork: // general, network-related error
            UIAlertView *alert = [[UIAlertView alloc]
                               initWithTitle:@"Location Error"
                               message:@"The Little Helper can't find you - please check your network connection or that you are not in airplane mode"
                               delegate:nil
                               cancelButtonTitle:@"OK"
                               otherButtonTitles:nil];
            AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);

            [alert show];
            [alert release];
            break;
    



-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
    NSLog(@"thisruns");
    MKCoordinateSpan span;
    span.latitudeDelta =0.2;
    span.longitudeDelta =0.2;

    MKCoordinateRegion region;
    region.span = span;
    region.center = newLocation.coordinate;


    [mapView setRegion:region animated:YES];
    mapView.showsUserLocation =YES;
    mapView.mapType = MKMapTypeHybrid;

    latitude.text = [NSString stringWithFormat:@"%f",newLocation.coordinate.latitude];
    longitude.text = [NSString stringWithFormat:@"%f",newLocation.coordinate.longitude];
    NSString *newloc=longitude.text;
    NSLog(@"long%f", newloc);

    [locationManager stopUpdatingLocation];

该属性与此相关

@property (nonatomic, retain) CLLocationManager *locationManager;

它被释放了

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

这几天我一直在反复讨论这个问题，任何帮助或提示都会很棒。 谢谢

编辑一个 尝试在应用程序委托中访问 locationManager，一切都运行但没有从 IBaction 更新位置 这是 IBaction 中的代码，日志的结果是 (null)

 LLHelperAppDelegate *appDelegate = (LLHelperAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.locationManager startUpdatingLocation];
    appDelegate.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    NSLog(@"%@", [appDelegate locationManager]);

【参考方案1】：

虽然作为 Apple 问题，您将无法完全消除泄漏，但您绝对可以在每次触发 getlocationgo 时阻止它发生。与其不断创建CLLocationManager，不如在应用程序的委托中使用一个CLLocationManager（或创建一个单例来支持它）。这样，您在应用程序的生命周期中只分配/初始化一个位置管理器，而目前您每次重新加载该视图/调用 getlocationgo 方法时分配/初始化一个位置管理器。

【讨论】：

好点，我从应用代理访问 locationManager 没有任何成功

希望你能看看上面编辑中的代码