iOS 检测版本更新代码-OC

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- (void)checkAppVersion {
    NSDate *now = [NSDate date];
    NSTimeInterval interval = [now timeIntervalSinceDate:[DataCenter singleton].appVerCheckDate];
    if (interval < 24 * 60 * 60) {
        // 一天内检测一次
        return;
    }
    
    [DataCenter singleton].appVerCheckDate = now;
    
    NSString *urlString = [NSString stringWithFormat:@"http://itunes.apple.com/cn/lookup?id=%@", @"你的 APP 的 apple id"];
    
    [[AFHTTPSessionManager new] GET:urlString parameters:nil success:^(NSURLSessionDataTask *task, id responseObject) {
        
        NSArray *infoArray = [responseObject objectForKey:@"results"];
        if ([infoArray count]) {
            NSDictionary *releaseInfo = [infoArray objectAtIndex:0];
            NSString *onlineVersionString = [releaseInfo objectForKey:@"version"];
            NSString *thisVersionString = [Utility versionRelease];
            
            NSArray *onlineVersionComponents = [onlineVersionString componentsSeparatedByString:@"."];
            NSArray *thisVersionComponents = [thisVersionString componentsSeparatedByString:@"."];
            
            NSUInteger minCount = MIN(onlineVersionComponents.count, thisVersionComponents.count);
            BOOL onlineVerGreaterThanThisVer = NO;
            for (NSUInteger i = 0; i < minCount; i ++) {
                NSUInteger onlineVersionBit = [onlineVersionComponents[i] integerValue];
                NSUInteger thisVersionBit = [thisVersionComponents[i] integerValue];
                if (onlineVersionBit == thisVersionBit) {
                    // 只要是相等就继续找下去，直至找到一个不相等的才能知道谁大谁小
                    continue;
                }else{
                    if (onlineVersionBit > thisVersionBit) {
                        onlineVerGreaterThanThisVer = YES;
                    }else{
                        // onlineVersionBit < thisVersionBit
                        onlineVerGreaterThanThisVer = NO;
                    }
                    break;
                }
            }
            
            if (onlineVerGreaterThanThisVer == NO && onlineVersionComponents.count > thisVersionComponents.count) {
                onlineVerGreaterThanThisVer = YES;
            }
            
            if (onlineVerGreaterThanThisVer) {
                NSLog(@"APP需要更新");
                self.urlApp = [releaseInfo objectForKey:@"trackViewUrl"];
                [HDAlertView showAlertwithTitle:HDLocalized(@"Note") message:HDLocalized(@"NewVersion") tiniColor:[CoreDataUpdateMethod sharedMethod].currentMoodColor delegate:self cancelButtonTitle:@"否" otherButtonTitles:@"是" ,nil].tag = 100102;
            }
        }
        
    } failure:nil];
}