Ios 为了节约而适当地保留资源

在报告成绩期间遇到错误时，我会将其添加到数组中，然后将数组保存到NSUserDefaults。但是，保存的信息始终为零。如何正确地保留数据？我尝试在添加时调用“保留成就”，但这并没有改变任何事情。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];
    }
}

---

尽管数组是在init中分配的，但ReportAcreaction方法似乎认为它是nil。测试nil修复了该问题

- (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];
                     }
                 }
             }];
        }
    }
}

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阅读这部苹果官方纪录片作为课堂参考

下面是来自GitHub的非常有用的源代码-列出了TypeOneError

       OR