如何跨设备分享已保存的游戏？

Question

我在我的iOS游戏中实现了GameKit,包括保存的游戏功能.

这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序列化和上传,如下所示:

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);
            }
        }];
    }
}

这就是我在下一个游戏会话中再次下载最近保存的游戏的方式:

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字符串来测试它name.有用!但是,一旦我尝试从我的第二个iPhone下载保存的游戏,它就不起作用.这两款手机我登录到同一游戏中心帐户,我可以通过对比确认这一点playerId的GKLocalPlayer实例.

我已经设置了正确的iCloud容器并将我的游戏链接到它,但iCloud容器后端的日志仍为空.

到底是怎么回事？如何在Apple设备上共享已保存的游戏？

Answer 1

问题中的上述示例效果很好。用户必须登录 iCloud 并在游戏中心登录时使用相同的 Apple ID，因为保存的游戏将存储在 iCloud 中。

不幸的是，我在没有 iCloud 的情况下测试了整个系统，所以它无法工作。