地理围栏 iOS 崩溃 EXC_BAD_ACCESS

Posted 2023-03-05

【中文标题】地理围栏 iOS 崩溃 EXC_BAD_ACCESS

【英文标题】：Geofence iOS Crash EXC_BAD_ACCESS

【发布时间】：2013-02-21 05:20:41

【问题描述】：

我正在尝试在我的应用中实施地理围栏。我正在编写Kevin McMahon 的精彩教程。

我的问题是每次尝试创建地理围栏时都会收到“EXC_BAD_ACCESS (code=1, address= ...)。

这是我的代码：

NSMutableArray *placeID = [[NSMutableArray alloc] init];
    NSMutableArray *lats = [[NSMutableArray alloc] init];
    NSMutableArray *longs = [[NSMutableArray alloc] init];

    for (int i = 0; i < [responseObject count]; i++) 
        [placeID addObject:[[responseObject objectAtIndex:i]objectForKey:@"id"]];
        [longs addObject:[[responseObject objectAtIndex:i]objectForKey:@"long"]];
        [lats addObject:[[responseObject objectAtIndex:i]objectForKey:@"lat"]];
    

    NSMutableDictionary *latDict = [[NSMutableDictionary alloc] initWithObjects:lats forKeys:placeID];
    NSMutableDictionary *longDict = [[NSMutableDictionary alloc] initWithObjects:longs forKeys:placeID];

    NSMutableArray *geofences = [[NSMutableArray array] init];

    for(int k = 0; k < [responseObject count]; k++) 
        CLRegion *geofence = [self mapDictionaryToRegionWithLat:latDict withLong:longDict usingID:[placeID objectAtIndex:k]];
        [geofences addObject:geofence];
    

    [self initializeRegionMonitoring:geofences];

创建 CLRegion

    - (CLRegion*)mapDictionaryToRegionWithLat:(NSDictionary *)latDict withLong:(NSDictionary *)longDict usingID: (NSString *)placeStringID 

        NSString *title = [NSString stringWithFormat:@"title %@", placeStringID];

        CLLocationDegrees latitude = [[latDict objectForKey:placeStringID] doubleValue];
        CLLocationDegrees longitude = [[longDict objectForKey:placeStringID] doubleValue];

        CLLocationCoordinate2D centerCoordinate = CLLocationCoordinate2DMake(latitude, longitude);

        CLLocationDistance regionRadius = 10.0;

        return [[CLRegion alloc] initCircularRegionWithCenter:centerCoordinate
                                                       radius:regionRadius
                                                   identifier:title];
    

初始化区域监视器

    - (void) initializeRegionMonitoring:(NSArray*)geofences 
        if (locationManager == nil) 
            //[NSException raise:@"Location Manager Not Initialized" format:@"You must initialize location manager first."];
        

        if(![CLLocationManager regionMonitoringAvailable]) 
            //[self showAlertWithMessage:@"This app requires region monitoring features which are unavailable on this device."];
            return;
        

        for(CLRegion *geofence in geofences)  //ERROR HAPPENS HERE AFTER 7 ITERATION
            [locationManager startMonitoringForRegion:geofence];
            NSLog(@"geofence made here:\n\n%@\n\n",geofences);
        
    

错误似乎发生在“for(CLRegion *geofence in geofences)”的第 7 次迭代之后（b/c 有 7 个地理围栏），因为我在“locationManager: manage didStartMonitoringForRegion: region”中的 NSLog 没有出现。

【问题讨论】：

...错误出现在哪一行？

哇！抱歉，现在修复了

so [locationManager startMonitoringForRegion:geofence];

见下文。这是我愚蠢的错误。糟糕的内存管理，与核心位置无关

【参考方案1】：

这个问题与地理围栏、位置或核心位置完全无关。我只是忘记释放我发起的这些可变数组：

NSMutableDictionary *latDict = [[NSMutableDictionary alloc] initWithObjects:lats forKeys:placeID];
NSMutableDictionary *longDict = [[NSMutableDictionary alloc] initWithObjects:longs forKeys:placeID];

刚刚在方法结束时发布了这些字典，一切正常！

【讨论】：

嗯？内存泄漏不会导致段错误。过度释放它确实如此。你的意思是不是偶然的相反？