iOS好使的各种文件文档、音乐、视频下载查看器有进度条

一、使用说明

采用第三方下载插件MCDownloadManager，

csdn地址   http://download.csdn.net/download/wangxiaoertedaye/10166107
github地址  https://github.com/zxgiOS/MCDownloadManager
两种实现方式

1）分步式，点击下载然后点击打开，可以使用按钮点击下载、查看，

2）一体式，点击直接下载打开，点击之后将URL传入插件调用

     MCDownloadReceipt *receipt = [[MCDownloadManager defaultInstance] downloadReceiptForURL:self.url];

    根据receipt.state判断是否下载或者直接打开，如果返回已下载就直接调用下述打开方法，未下载则调用下载方法下载完成后打开

二、效果图



三、使用方法

1.设置下载URL，设置进度条

    MCDownloadReceipt *receipt = [[MCDownloadManager defaultInstance] downloadReceiptForURL:url];

    self.progressView.progress = receipt.progress.fractionCompleted;

2.点击开始下载，download中监听下载进度更新进度条

    - (void)downloadBtnAction:(UIButton *)sender{

    

    MCDownloadReceipt *receipt = [[MCDownloadManager defaultInstance] downloadReceiptForURL:self.url];

    

    if (receipt.state == MCDownloadStateDownloading) {//当前正在下载中

        [sender setTitle:@"下载" forState:UIControlStateNormal];

        [[MCDownloadManager defaultInstance] suspendWithDownloadReceipt:receipt];

    }else if (receipt.state == MCDownloadStateCompleted) {//已下载

        

        if ([self.delegate respondsToSelector:@selector(cell:didClickedBtn:)]) {

            [self.delegate cell:self didClickedBtn:sender];

        }

    }else {//未下载

        [sender setTitle:@"停止" forState:UIControlStateNormal];

        [self download];

    }

}

- (void)download {

    [[MCDownloadManager defaultInstance] downloadFileWithURL:self.url

                                                    progress:^(NSProgress * _Nonnull downloadProgress, MCDownloadReceipt *receipt) {

                                                        NSLog(@"%@,%@",receipt.url,self.url);

                                                        if ([receipt.url isEqualToString:self.url]) {

                                                            self.progressView.progress = downloadProgress.fractionCompleted ;

                                                            self.sizeLabel.text = [NSString stringWithFormat:@"%0.2fm/%0.2fm", downloadProgress.completedUnitCount/1024.0/1024, downloadProgress.totalUnitCount/1024.0/1024];

                                                        }

                                                        

                                                    }

                                                 destination:nil

                                                     success:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, NSURL * _Nonnull filePath) {

                                                         [self.downloadBtn setTitle:@"查看" forState:UIControlStateNormal];

                                                     }

                                                     failure:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, NSError * _Nonnull error) {

                                                         [self.downloadBtn setTitle:@"下载" forState:UIControlStateNormal];

                                                     }];

    

}

3.下载完成查看  传入需要查看文件的URL 插件自动关联已经下载好的(相当于缓存机制，避免重复下载)如果需要下载之后直接打开则在上述download方法下载完成中调用打开方法

- (void)openDocBycell:(DownLoadTableViewCell *)cell{

    

    MCDownloadReceipt *receipt = [[MCDownloadManager defaultInstance] downloadReceiptForURL:cell.url];

    //UIViewController *vc = [UIApplication sharedApplication].keyWindow.rootViewController;

    self.doc = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:receipt.filePath]];

    

    self.doc.name = @"文档预览";

    self.doc.accessibilityNavigationStyle = 2;

    self.doc.delegate = self;

    [self.doc presentPreviewAnimated:YES];

    //[documentVC openFileWithURL:[NSURL fileURLWithPath:receipt.filePath]];

}