保存自定義Objective-c對象的層次結構以實現持久性的最佳方法

Question

我正在編寫一個應用程序，該應用程序允許用戶為可能選擇的到達不同位置的多條路線計時，然后將其保存為可查看數據的存檔。 我遇到的問題是保存數據以供永久使用。 我已經閱讀了NSCoding協議，但是由於對象中存在不兼容的屬性（例如CLCoordinateLocation2D），它似乎無法滿足我的對象需求（我知道我可以分解成更多的組件，例如緯度和經度，但是我認為必須有更好的方法），但還有其他方法。 我來自Java，我需要做的就是實現可序列化的接口，我很高興，但是我對Objective-C還是陌生的，並且不確定解決問題的最佳方法。

這是我需要序列化的對象結構。

@interface BestRouteBrain : NSObject < CLLocationManagerDelegate, NSCoding > {
    NSDictionary *segments;
    BestRouteTimer *timer;
    BestRouteSegment *currentSegment;
    //Manages attributes that communicate with GPS
    CLLocationManager *locationManager;
    Firebase *firebase;
   //NSDictionary *routesByTimeOfDay;
   //NSDictionary *routesByAverage;
}

@property ( strong ) CLLocationManager *locationManager;
@property BestRouteSegment *currentSegment;
@property BestRouteTimer *timer;
@property NSDictionary *segments;
@property Firebase *firebase;

基本上，我需要序列化的就是NSDictionary *segments 。 這是段的樣子

@interface BestRouteSegment :NSObject <NSCoding>{
    // Name of segment
    NSString *segmentName;
    // String reprsenting starting location for segment
    NSString *startingLocation;
    // String representing ending location for segment
    NSString *endingLocation;
    //Key is name of route and value is a route object;
    NSDictionary *routesForSegment;
    CLLocationCoordinate2D startCoord;
    CLLocationCoordinate2D endCoord;
}

@property CLLocationCoordinate2D startCoord;
@property CLLocationCoordinate2D endCoord;
@property NSString *startingLocation;
@property NSString *endingLocation;
@property NSString *segmentName;
@property NSDictionary *routesForSegment;

該對象中的所有屬性也都需要序列化，包括NSDictionary *routesForSegment 。 這是一條路線的樣子，

@interface Route : NSObject {
    // Name of route given by user
    NSString *routeName;
    // The total average time for all trips using this route
    double  avgRouteTime;
    // Array of trips which used this route
    NSArray *allTripsFromRoute;
}

@property NSString *routeName;
@property double avgRouteTime;
@property NSArray *allTripsFromRoute;

所有這些屬性也需要序列化。 最后，這是一次旅行的樣子。

@interface BestRouteTrip : NSObject {
    // Time elapsed for current trip
    double tripTime;
    // String representing time of day - Departure time is
    NSString *timeOfDay;
    NSDate *morningBeforeTrafic;// from 12:00am to 6:30am
    NSDate *morningTrafic; // from 6:30am to 9:30am
    NSDate *morningAfterTrafic; // from 9:30am to 12:00pm
    NSDate *afternoon;    // from 12:00pm to 3:30pm
    NSDate *eveningTrafic; // from 3:30pm to 6:30pm
    NSDate *eveningAfterTrafic; // from 6:30pm to 12:00p
}

@property double tripTime;
@property NSString *timeOfDay;
@property NSDate *morningBeforeTrafic;// from 12:00am to 6:30am
@property NSDate *morningTrafic; // from 6:30am to 9:30am
@property NSDate *morningAfterTrafic; // from 9:30am to 12:00pm
@property NSDate *afternoon;    // from 12:00pm to 3:30pm
@property NSDate *eveningTrafic; // from 3:30pm to 6:30pm
@property NSDate *eveningAfterTrafic; // from 6:30pm to 12:00p

我在這里需要序列化的僅有兩個值是double tripTime和NSString *timeOfDay 。

摘要：大腦具有需要序列化的片段字典。 該段具有要序列化的屬性，包括路由字典（另一個自定義對象）。 Routes具有要序列化的屬性，包括Trips數組。 最后，行程有兩個需要序列化的值。

在此先感謝您的協助。

Answer 1

好的，所以我通過在BestRouteSegment內實現NSCoding協議解決了這個問題，該協議對我的段進行了編碼而沒有錯誤。 這是遵守上述協議的方法。

- (void)encodeWithCoder:(NSCoder *)encoder {
    NSLog(@"Encode in segment was called");
    [ encoder encodeDouble:self.startCoord.latitude
                    forKey:@"startCoord.latitude" ];
    [ encoder encodeDouble:self.startCoord.longitude
                    forKey:@"startCoord.longitude" ];
    [ encoder encodeDouble:self.endCoord.latitude
                    forKey:@"endCoord.latitude" ];
    [ encoder encodeDouble:self.endCoord.longitude 
                    forKey:@"endCoord.longitude" ];
    [ encoder encodeObject:self.segmentName
                    forKey:@"segmentName" ];
    [ encoder encodeObject:self.startingLocation
                    forKey:@"startingLocation" ];
    [ encoder encodeObject:self.endingLocation
                    forKey:@"endingLocation" ];
    [ encoder encodeObject:self.routesForSegment
                    forKey:@"routesForSegment" ];
}

- (id)initWithCoder:(NSCoder *)adecoder {
    NSLog(@"Init with coder was called in segment");
    if ( self = [ super init ] ) {
        self.startCoord =
        CLLocationCoordinate2DMake(
                                   [ adecoder decodeDoubleForKey:@"startCoord.lattitude" ],
                                   [ adecoder decodeDoubleForKey:@"startCoord.longitude" ]
                                   );
        self.endCoord =
        CLLocationCoordinate2DMake(
                                   [ adecoder decodeDoubleForKey:@"endCoord.lattitude" ],
                                   [ adecoder decodeDoubleForKey:@"endCoord.longitude" ]
                                   );
        self.segmentName =
        [ adecoder decodeObjectForKey:@"segmentName" ];
        self.startingLocation =
        [ adecoder decodeObjectForKey:@"startingLocation" ];
        self.endingLocation =
        [ adecoder decodeObjectForKey:@"endingLocation" ];
        self.routesForSegment =
        [ adecoder decodeObjectForKey:@"routesForSegment" ];

    }
    return self;
}