Ios 我的精简版INTULocationManager不起作用

我有一个使用IntLocationManager的iPhone混合应用程序，运行良好，但该软件远远超出了我的需要。就我所能看到的而言，我已经简略地讲了一些基本的内容，但是当我试图调用位置请求时保存的块的回调时，我显然犯了一些错误。请有人帮我找出可能相当明显的错误

我的.h文件是

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

typedef void(^SBLocationRequestBlock)(CLLocation *currentLocation);

@interface SBLocationManager : NSObject

// Returns the singleton instance of this class.

+ (instancetype)sharedInstance;

// Creates a subscription for location updates

- (void)subscribeToLocationUpdatesWithBlock:(SBLocationRequestBlock)block;

// Set the minimum distance between two successive location returns

- (void)setDistanceFilter:(double)distance;

@end

然而，当我运行这个（在模拟器中）时，我得到

线路自块中的EXC_坏访问（mostRecentLocation）

i、 e.位置管理器已设置并返回位置，但我调用请求块的代码失败。我在调试器中注意到，self.block在subscribeToLocationUpdatesWithBlock中时正确地指向我的视图控制器代码，但当代码调用主队列上的块时，它指向其他地方。这是因为self在这段代码中不再相同了

---

我为糟糕的术语道歉，我是一名javascript程序员，试图用XCode做一些可能超出我能力范围的事情。任何人能提供的任何帮助都会很好。

我会使用

copy

，而不是

assign

作为块属性

assign

通常用于

int

之类的简单操作

要缩小是块还是位置，请在调用块之前为

mostRecentLocation

添加

NSLog

如果不是这样，请查看我关于调试

EXC\u BAD\u ACCESS

的博客帖子：

#import "SBLocationManager.h"
#import "SBLocationManager+Internal.h"

@interface SBLocationManager () <CLLocationManagerDelegate>

// The instance of CLLocationManager encapsulated by this class.
@property (nonatomic, strong) CLLocationManager *locationManager;
// Whether or not the CLLocationManager is currently sending location updates.
@property (nonatomic, assign) BOOL isUpdatingLocation ;
//Whether an error occurred during the last location update.
@property (nonatomic, assign) BOOL updateFailed;
// the code to be called when a location is available
@property (nonatomic, assign) SBLocationRequestBlock block;
@end


@implementation SBLocationManager

static id _sharedInstance;

// Create instance of this class.

- (instancetype)init
    {
    //self = [super init];
    if (self) {
        _locationManager = [[CLLocationManager alloc] init];
        _locationManager.delegate = self;
        _locationManager.pausesLocationUpdatesAutomatically = NO; // to keep it going in background mode

#ifdef __IPHONE_8_4
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_8_4
        /* iOS 9 requires setting allowsBackgroundLocationUpdates to YES in order to receive background location updates.
         We only set it to YES if the location background mode is enabled for this app, as the documentation suggests it is a
         fatal programmer error otherwise. */
        NSArray *backgroundModes = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UIBackgroundModes"];
        if ([backgroundModes containsObject:@"location"]) {
            if ([_locationManager respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) {
                [_locationManager setAllowsBackgroundLocationUpdates:YES];
            }
        }
#endif /* __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_8_4 */
#endif /* __IPHONE_8_4 */

    }
    self.isUpdatingLocation = NO ;
    return self;
}

+ (instancetype)sharedInstance
    {
    static dispatch_once_t _onceToken;
    dispatch_once(&_onceToken, ^{
        _sharedInstance = [[self alloc] init];
    });
    return _sharedInstance;
    }

- (void)subscribeToLocationUpdatesWithBlock:(SBLocationRequestBlock)block
    {
    self.block = block;
    [self requestAuthorizationIfNeeded];
    [self.locationManager startUpdatingLocation];
    self.isUpdatingLocation = YES;
    }

- (void)setDistanceFilter:(double)distance
    {
    self.locationManager.distanceFilter = distance ;
    self.locationManager.desiredAccuracy = distance ;
    }


#pragma mark Internal methods


//Requests permission to use location services on devices with iOS 8+.

- (void)requestAuthorizationIfNeeded
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_7_1
    // As of iOS 8, apps must explicitly request location services permissions
    // SBLocationManager supports both levels, "Always" and "When In Use".
    // SBLocationManager determines which level of permissions to request based
    // which description key is present in your app's Info.plist
    // If you provide values for both description keys, the more permissive "Always
    // level is requested.
    if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1 && [CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {
        BOOL hasAlwaysKey = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"] != nil;
        BOOL hasWhenInUseKey = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationWhenInUseUsageDescription"] != nil;
        if (hasAlwaysKey) {
            [self.locationManager requestAlwaysAuthorization];
        } else if (hasWhenInUseKey) {
            [self.locationManager requestWhenInUseAuthorization];
        } else {
            // At least one of the keys NSLocationAlwaysUsageDescription
            // NSLocationWhenInUseUsageDescription MUST be present in the Info.plis
            // file to use location services on iOS 8+.
            NSAssert(hasAlwaysKey || hasWhenInUseKey, @"To use location services in iOS 8+, your Info.plist must provide a value for either NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription.");
        }
    }
#endif /* __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_7_1 */
}


#pragma mark CLLocationManagerDelegate methods

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
    {
    self.updateFailed = NO;

    CLLocation *mostRecentLocation = [locations lastObject];

    dispatch_async(dispatch_get_main_queue(), ^{
            if (self.block) {
                self.block(mostRecentLocation);
            }
        });
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
        {
    self.updateFailed = YES;
        }

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
        {
        }

@end

- (void)requestLocationUpdates:(double)distanceValue
{
    SBLocationManager *locMgr = [SBLocationManager sharedInstance];
    [locMgr subscribeToLocationUpdatesWithBlock:^(CLLocation *currentLocation) {

    NSLog (@"New Location:\n%@", currentLocation);
    NSString *javascriptString = [NSString stringWithFormat:@"UpdateOwnLocation('%.6f','%.6f','%.6f');", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude, currentLocation.horizontalAccuracy];

    [webView stringByEvaluatingJavaScriptFromString:javascriptString];

    }];
    [locMgr setDistanceFilter:distanceValue];
}

- (void) changeLocationUpdates:(double)distanceValue
{
    SBLocationManager *locMgr = [SBLocationManager sharedInstance];
    [locMgr setDistanceFilter:distanceValue];
}