Ios 你知道为什么一个对象不能在objective-c ARC中释放吗

我试图理解为什么一个对象没有在我的代码中释放，以及如何修复这个问题。我已经为所有类和一个外部库（3.3.0）启用了ARC

I在下面的代码中，属性del2未被解除分配（不调用IndoorsTestDelegate的dealloc方法）。del2属性在registerLocationListener:message中传递给室内实例，并在视图控制器中解除锁定期间从中删除。当视图控制器在导航控制器堆栈中被推回时，调用视图控制器的dealloc方法。也会调用IndoorTestDelegate中的del1 dealloc方法，但不会调用del2 dealloc方法。我的问题是为什么不调用del2 dealloc方法，以及如何解决这个问题。我没有来自外部图书馆的资料

这是视图控制器代码：

#import "IndoorsTestVC.h"
#import "IndoorsTestDelegate.h"
#import <Indoors/Indoors.h>
#import <IndoorsSurface/ISIndoorsSurfaceViewController.h>

@interface IndoorsTestVC ()

@property (strong, nonatomic) IndoorsTestDelegate *del1;
@property (strong, nonatomic) IndoorsTestDelegate *del2;

@end

@implementation IndoorsTestVC

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.del1 = [[IndoorsTestDelegate alloc]
        initWithController:self
                   andName:@"Del1"];
    self.del2 = [[IndoorsTestDelegate alloc]
        initWithController:self
                   andName:@"Del2"];

    __unused Indoors *indoors = [[Indoors alloc]
        initWithLicenseKey:API_KEY
        andServiceDelegate:self.del1];
    [[Indoors instance] enableEvaluationMode:NO];
    [[Indoors instance] setLogLevel:IDSLogLevelWarning];
    [[Indoors instance] registerLocationListener:self.del2];

    ISIndoorsSurfaceViewController *surfaceVC = [[ISIndoorsSurfaceViewController alloc] init];
    surfaceVC.delegate = self.del1;

    // add surfaceVC as a child view controller
    [self addChildViewController:surfaceVC];
    [self addSubview:surfaceVC.view
        withEqualSizeLikeParent:self.view];
    [surfaceVC didMoveToParentViewController:self];

    // load building
    [surfaceVC loadBuildingWithBuildingId:1234];

}

- (void)dealloc {
    [[Indoors instance] removeLocationListener:self.del2];
    NSLog(@"Dealloc test controller %@", _title);
}

---

-instance

（

室内

）的代码是什么？什么是[[室内实例]registerLocationListener:self.del2]；这个类来自外部库，我没有源代码。从文档中可以看出，类方法+实例检索单个对象。室内单例对象使用initWithLicenseKey:和ServiceDelegate:消息初始化。

#import <Foundation/Foundation.h>
#import <Indoors/Indoors.h>
#import <IndoorsSurface/ISIndoorsSurfaceViewController.h>

@interface IndoorsTestDelegate : NSObject <IndoorsServiceDelegate, ISIndoorsSurfaceViewControllerDelegate, IndoorsLocationListener>

@property (weak, nonatomic) UIViewController *controller;
@property (strong, nonatomic) NSString *name;

- (instancetype)initWithController:(UIViewController *) controller
                           andName:(NSString *)name;
@end

#import "IndoorsTestDelegate.h"

@implementation IndoorsTestDelegate

- (instancetype)initWithController:(UIViewController *)controller
    andName:(NSString *)name
{
    self = [super init];
    if (self) {
        _controller = controller;
        _name = name;
    }
    return self;
}

- (void)dealloc {
    // This method is called for del1 property
    // but for del2 not. Why?
    NSLog(@"Dealloc %@", _name);
}

// The protocols methods are empty in testing delegate

#pragma mark IndoorsLocationListener
- (void)zonesEntered:(NSArray *)zones {}
- (void)positionUpdated:(IDSCoordinate *)userPosition {}
- (void)contextUpdated:(IDSContext *)context {}
- (void)changedFloor:(int)floorLevel withName:(NSString *)name {}
- (void)weakSignal {}
- (void)orientationUpdated:(float)orientation {}

#pragma mark ISIndoorsSurfaceViewControllerDelegate
- (void)indoorsSurfaceViewController:(ISIndoorsSurfaceViewController *)indoorsSurfaceViewController isLoadingBuildingWithBuildingId:(NSUInteger)buildingId progress:(NSUInteger)progress {}
- (void)indoorsSurfaceViewController:(ISIndoorsSurfaceViewController *)indoorsSurfaceViewController didFinishLoadingBuilding:(IDSBuilding *)building {}
- (void)indoorsSurfaceViewController:(ISIndoorsSurfaceViewController *)indoorsSurfaceViewController didFailLoadingBuildingWithBuildingId:(NSUInteger)buildingId error:(NSError *)error {}

#pragma mark - IndoorsSurfaceServiceDelegate
- (void)onError:(IndoorsError *)indoorsError {}
- (void)bluetoothStateDidChange:(IDSBluetoothState)bluetoothState {}
- (void)locationAuthorizationStatusDidChange:(IDSLocationAuthorizationStatus)status {}
- (void)connected {}
@end