如何在设备之间共享保存的游戏?

时间:2018-10-24 17:42:36

标签: objective-c icloud game-center objective-c++ gamekit

我在我的iOS游戏中实现了GameKit,包括已保存的游戏功能。

以下是我如何保存和加载游戏的示例:

MobSvcSavedGameData.h

#ifndef MOBSVC_SAVEDGAMEDATA_H
#define MOBSVC_SAVEDGAMEDATA_H

#import <Foundation/Foundation.h>

@interface MobSvcSavedGameData : NSObject <NSCoding>

@property (readwrite, retain) NSString *data;

+(instancetype)sharedGameData;
-(void)reset;

@end


#endif /* MOBSVC_SAVEDGAMEDATA_H */

MobSvcSavedGameData.m

#import "MobSvcSavedGameData.h"
#import <Foundation/Foundation.h>

@interface MobSvcSavedGameData () <NSObject, NSCoding>

@end

@implementation MobSvcSavedGameData

#pragma mark MobSvcSavedGameData implementation

static NSString * const sgDataKey = @"data";

+ (instancetype)sharedGameData {
    static id sharedInstance = nil;

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[self alloc] init];
    });

    return sharedInstance;
}

- (void)reset
{
    self.data = nil;
}

- (void)encodeWithCoder:(NSCoder *)encoder
{
    [encoder encodeObject:self.data forKey: sgDataKey];
}

- (nullable instancetype)initWithCoder:(nonnull NSCoder *)decoder {
    self = [self init];
    if (self) {
        self.data = [decoder decodeObjectForKey:sgDataKey];
    }
    return self;
}

@end

为简单起见,我上面保存的游戏对象只有一个NSString,它将像这样被序列化并上传:

void MobSvc::uploadSavedGameDataAwait(const char *name, const char *data)
{
    GKLocalPlayer *mobSvcAccount = [GKLocalPlayer localPlayer];

    if(mobSvcAccount.isAuthenticated)
    {
        MobSvcSavedGameData *savedGameData = [[MobSvcSavedGameData alloc] init];
        savedGameData.data = [NSString stringWithUTF8String:data];
        [mobSvcAccount saveGameData:[NSKeyedArchiver archivedDataWithRootObject:savedGameData] withName:[[NSString alloc] initWithUTF8String:name] completionHandler:^(GKSavedGame * _Nullable savedGame __unused, NSError * _Nullable error) {
            if(error == nil)
            {
                NSLog(@"Successfully uploaded saved game data");
            }
            else
            {
                NSLog(@"Failed to upload saved game data: %@", error.description);
            }
        }];
    }
}

这是我在下一次播放会话中再次下载最新保存的游戏的方式:

void MobSvc::downloadSavedGameDataAwait(const char *name)
{
    GKLocalPlayer *mobSvcAccount = [GKLocalPlayer localPlayer];

    if(mobSvcAccount.isAuthenticated)
    {
        [mobSvcAccount fetchSavedGamesWithCompletionHandler:^(NSArray<GKSavedGame *> * _Nullable savedGames, NSError * _Nullable error) {
            if(error == nil)
            {
                GKSavedGame *savedGameToLoad = nil;
                for(GKSavedGame *savedGame in savedGames) {
                    const char *sname = savedGame.name.UTF8String;
                    if(std::strcmp(sname, name) == 0)
                    {
                        if (savedGameToLoad == nil || savedGameToLoad.modificationDate < savedGame.modificationDate) {
                            savedGameToLoad = savedGame;
                        }
                    }
                }
                if(savedGameToLoad != nil) {
                    [savedGameToLoad loadDataWithCompletionHandler:^(NSData * _Nullable data, NSError * _Nullable error) {
                        if(error == nil)
                        {
                            MobSvcSavedGameData *savedGameData = [NSKeyedUnarchiver unarchiveObjectWithData:data];
                            NSLog(@"Successfully downloaded saved game data: %@", [savedGameData.data cStringUsingEncoding:NSUTF8StringEncoding]);
                        }
                        else
                        {
                            NSLog(@"Failed to download saved game data: %@", error.description);
                        }
                    }];
                }
            }
            else
            {
                NSLog(@"Failed to prepare saved game data: %@", error.description);
            }
        }];
    }
}

我通过上传随机字符串并在下一个会话中使用相同的name来接收它来进行了测试。有用!但是,一旦我尝试从第二部iPhone下载已保存的游戏,它将无法正常工作。在我登录相同游戏中心帐户的两部手机上,可以通过比较playerId实例中的GKLocalPlayer来确认这一点。

我已经设置了正确的iCloud容器并将游戏链接到它,但是iCloud容器后端中的日志仍然为空。

这是怎么回事?如何在Apple设备上共享保存的游戏?

1 个答案:

答案 0 :(得分:1)

问题中的上述示例工作正常。强制用户登录iCloud并在Game Center登录名上使用相同的Apple ID,因为保存的游戏将存储在iCloud中。

不幸的是,我在没有iCloud的情况下进行了整体测试,因此无法正常工作。