Question

我有一个应用程序，它创建一个包含（其中包括）某些位置数据的类实例。

在app delegate中，我设置了位置服务并开始抓取位置数据;

//Delegate method to receive location infomation from locationManager
- (void)locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
           fromLocation:(CLLocation *)oldLocation
{


    latestLocation = newLocation;//Make latest location the same as NewLocation
    NSLog(@"Location is: %@", latestLocation);

}

我将最新位置声明为属性，以便我可以从另一个类获取CLLocation实例。

我的捕获类，当调用其init方法时调用CLLocation;

//Designated initialiser
-(id) initWithVideoPath:(NSString *) vPath 
              userNotes:(NSString *) uNotes
         retentionState:(NSString *) rState

{

    //Call the super classes designated initializer
    [super init];

    //Get a pointer to the application delegate so we can access the location props
    Rolling_VideoAppDelegate *appDelegate = (Rolling_VideoAppDelegate*)[UIApplication sharedApplication].delegate;



    //If superclass failed to init
    if (!self)
        return nil;



    //Give the variables some initial values
    [self setVideoPath:vPath];
    [self setUserNotes:uNotes];
    [self setRetentionState:rState];
    dateCreated = [[NSDate alloc] init];


    mp = [[MapPoint alloc]initWithCoordinate:[[appDelegate latestLocation]coordinate]];//get the location from the coords from appDelegate

    return self;

    [dateCreated release];

}

然而，当调用mapPoint init时，应用程序崩溃。问题是我没有正确获取CLLocation信息。

任何人都可以帮助我。

提前致谢，

富

Answer 1

我仍然不确定为什么原始解决方案不起作用，所以如果有人有任何见解，请指教。

然而，我已经解决了使用NSUserDefaults

的一项略显不雅的工作

    latestLocation = newLocation;//Make latest location the same as NewLocation

    //Use NSUser Defaults to save the CLLocation instance
    NSUserDefaults *location = [NSUserDefaults standardUserDefaults];
    [location setDouble:latestLocation.coordinate.latitude forKey:@"lat"];
    [location setDouble:latestLocation.coordinate.longitude forKey:@"longd"];

我需要打破lat，只要NSUserDefaults不存储CLLocation对象（NSCoding兼容性），就可以在capture类中重构它们;

    NSUserDefaults *location = [NSUserDefaults standardUserDefaults];//Get a handle to the user defaults
    CLLocationDegrees lat = [location doubleForKey:@"lat"];
    CLLocationDegrees longd = [location doubleForKey:@"longd"];
    CLLocation *currentLocation = [[CLLocation alloc] initWithLatitude:lat longitude:longd];

    mp = [[MapPoint alloc]initWithCoordinate:[currentLocation coordinate]];//get the location from the coords from appDelegate

从appDelegate请求CLLocation属性时应用程序崩溃

1 个答案: