Question

在报告成就期间遇到错误时，我将其添加到数组中，然后将数组保存到NSUserDefaults。但是，保存的信息总是为零。你如何妥善保留数据？我尝试在添加时调用retain成就，但这并没有改变任何东西。我写的数据，可以看到文件，但里面的对象是零。

- (void)reportAchievementIdentifier:(NSString*)identifier percentComplete:(float)percent
{
    if (self.isGameCenterEnabled) {
        GKAchievement *achievement = [[[GKAchievement alloc] initWithIdentifier:identifier] autorelease];
        if (achievement)
        {
            achievement.percentComplete = percent;
            [achievement reportAchievementWithCompletionHandler:^(NSError *error)
             {
                 if (error != nil)
                 {
                     if (![outstandingAchievementsToReport containsObject:achievement]){
                         [outstandingAchievementsToReport addObject:achievement];
                         [self saveUnsyncedAchievements];
                     }
                 }
             }];
        }
    }
}

- (void)saveUnsyncedAchievements
{  
    NSString *docsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *savePath = [docsPath stringByAppendingPathComponent:@"Achievements"];

    // Write to disk    
    if (![NSKeyedArchiver archiveRootObject:outstandingAchievementsToReport toFile:savePath]) {      
        NSLog(@" archiver write failed.");
    } else {
        NSLog(@" archiver write succeeded.");
    }
}

- (void)loadUnsyncedAchievements
{
    NSString *docsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *savePath = [docsPath stringByAppendingPathComponent:@"Achievements"];

    // Read from disk
    outstandingAchievementsToReport = [NSKeyedUnarchiver unarchiveObjectWithFile:savePath];

    NSLog(@"outstandingAchievementsToReport count = %d", [outstandingAchievementsToReport count]);
}

- (void) reportOutstandingAchievements {
    NSLog(@"Report all outstanding achievements.");
    for (GKAchievement *achievement in outstandingAchievementsToReport) {
        [self reportAchievementIdentifier:achievement.identifier percentComplete:achievement.percentComplete];
    }
}

Answer 1

尽管数组是在init中分配的，但似乎reportAchievement方法认为它是零。测试nil解决了这个问题。

- (void)reportAchievementIdentifier:(NSString*)identifier percentComplete:(float)percent
{
    if (self.isGameCenterEnabled) {
        GKAchievement *achievement = [[[GKAchievement alloc] initWithIdentifier:identifier] autorelease];
        if (achievement)
        {
            achievement.percentComplete = percent;
            [achievement reportAchievementWithCompletionHandler:^(NSError *error)
             {
                 if (error != nil)
                 {
                     if (nil == outstandingAchievementsToReport) 
                         outstandingAchievementsToReport = [[NSMutableArray alloc] init];

                     if (![outstandingAchievementsToReport containsObject:achievement]){
                         [outstandingAchievementsToReport addObject:achievement];
                     }
                 }
             }];
        }
    }
}

Answer 2

阅读Apple官方纪录片作为课程参考 http://developer.apple.com/library/ios/#documentation/GameKit/Reference/GKAchievement_Ref/Reference/Reference.html

OR

这是来自GitHub列出的TypeOneError非常有用的资源 http://www.typeoneerror.com/articles/post/game-center-achievement-notification

正确保留GKAchievement以便保存

2 个答案: