多线程下载任务

'''

NSString *keyName = [NSString stringWithFormat:@"/Documents/wordClass_%@_%ld.json",[PlayerInfoModel shared].uid,self.studyInfoModel.courseId];
NSDictionary *dic = [AppUntils readLocalFileWithName:keyName];

self.model = [WordsMainModel modelWithDictionary:dic];
self.isDone = 0;

NSString *filePath_fist = [NSString stringWithFormat:@"/Documents/wordInfo_%ld_%@",self.studyInfoModel.courseId,[self.model.wordsArr firstObject]];
NSDictionary *fistDic = [AppUntils readLocalFileWithName:filePath_fist];
//创建一个NSBlockOperation对象，传入一个block
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
queue.maxConcurrentOperationCount = 1000;

if (fistDic != nil) {
    self.progressView.hidden = NO;
    DLog(@"---------- 开始下载 -----------");
    for (int i = 0; i < self.model.wordsArr.count; i ++) {
        NSString *urlString = [NSString stringWithFormat:@"%@word/file?courseId=%ld&word=%@&fileType=0",ApiString,(long)self.studyInfoModel.courseId,[AppUntils hexStringFromString:[self.model.wordsArr objectAtIndex:i]]];
        
        NSString *filePath = [NSString stringWithFormat:@"/Documents/wordInfo_%ld_%@",self.studyInfoModel.courseId,[self.model.wordsArr objectAtIndex:i]];

        NSString *urlString_2 = [NSString stringWithFormat:@"%@word/file?courseId=%ld&word=%@&fileType=2",ApiString,(long)self.studyInfoModel.courseId,[AppUntils hexStringFromString:[self.model.wordsArr objectAtIndex:i]]];
        
        NSString *filePath_2 = [NSString stringWithFormat:@"/Documents/word_audio_uk_%ld_%@",self.studyInfoModel.courseId,[self.model.wordsArr objectAtIndex:i]];

        NSString *urlString_3 = [NSString stringWithFormat:@"%@word/file?courseId=%ld&word=%@&fileType=3",ApiString,(long)self.studyInfoModel.courseId,[AppUntils hexStringFromString:[self.model.wordsArr objectAtIndex:i]]];
        
        NSString *filePath_3 = [NSString stringWithFormat:@"/Documents/word_audio_en_%ld_%@",self.studyInfoModel.courseId,[self.model.wordsArr objectAtIndex:i]];
        DLog(@"第%d个任务加入队列",i);
        [queue addOperationWithBlock:^{
            [XHNetworking GET:urlString parameters:@{} success:^(id responseObject) {
                NSString *receiveStr = [[NSString alloc]initWithData:responseObject encoding:NSUTF8StringEncoding];
                self.isDone ++;
                NSData * datas = [receiveStr dataUsingEncoding:NSUTF8StringEncoding];
                NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:datas options:NSJSONReadingMutableLeaves error:nil];
                [AppUntils writJson:jsonDict WithKeyName:filePath];
            } failure:^(NSError *error) {
                DLog(@">>>>>>>>wordInfo下载失败");
                self.isDone ++;
            }];
        }];
        [queue addOperationWithBlock:^{
            [XHNetworking GET:urlString_2 parameters:@{} success:^(id responseObject) {
                [AppUntils writData:responseObject WithKeyName:filePath_2];
                self.isDone ++;
            } failure:^(NSError *error) {
                self.isDone ++;
                DLog(@">>>>>>>>音频1下载失败");
            }];
        }];
        [queue addOperationWithBlock:^{
            [XHNetworking GET:urlString_3 parameters:@{} success:^(id responseObject) {
                [AppUntils writData:responseObject WithKeyName:filePath_3];
                self.isDone ++;
            } failure:^(NSError *error) {
                self.isDone ++;
                DLog(@">>>>>>>>音频2下载失败");
            }];
        }];
    }
}

'''