Whde

ResumeFromBreakPoint断点下载

BreakPoint

Objective-C实现断点续传,Demo简单易懂,没有太多复杂模块和逻辑,完整体现断点续传的原理
https://github.com/whde/ResumeFromBreakPoint 为对应的Swift断点续传

示例

WhdeBreakPoint

简单的网络请求队列管理类,简单的管理,不做太多复杂处理

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/*创建请求,添加请求到数组中
WhdeSession请求失败,取消请求等需要从数组中移除*/
+ (WhdeSession *)asynDownloadWithUrl:(NSString *)urlStr progressBlock:(ProgressBlock)progress successBlock:(SuccessBlock) success failureBlock:(FailureBlock)failure;
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/*取消请求,移除数组中对应的请求*/
+ (void)cancel:(NSString *)urlStr;
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/*暂停,即为取消请求*/
+ (void)pause:(NSString *)urlStr;

WhdeFileManager

断点续传专用的文件管理

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/*根据NSURL获取存储的路径,文件不一定存在
文件名为Url base64转换*/
+ (NSString *)filePath:(NSURL *)url;
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/*获取对应文件的大小*/
+ (long long)fileSize:(NSURL *)url;
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/*根据url删除对应的文件*/
+ (BOOL)deleteFile:(NSURL *)url;

WhdeSession

网络收发

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/*创建请求,开始下载,设置已经下载的位置*/
+ (instancetype)asynDownloadWithUrl:(NSString *)urlStr progressBlock:(ProgressBlock)progress successBlock:(SuccessBlock) success failureBlock:(FailureBlock)failure callCancelBlock:(CallCancel)callCancel;
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/*取消下载*/
- (void)cancel;
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/*暂停下载即为取消下载*/
- (void)pause;
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/*出现错误,取消请求,通知失败*/
- (void)URLSession:(NSURLSession *)session didBecomeInvalidWithError:(NSError *)error;
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/*下载完成*/
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error;
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/*接收到数据,将数据存储*/
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
    NSHTTPURLResponse *response = (NSHTTPURLResponse *)dataTask.response;
    if (response.statusCode == 200) {
        /*无断点续传时候,一直走200*/
        if (self.progressBlock) {
            self.progressBlock(((float)dataTask.countOfBytesReceived+self.startFileSize)/((float)(dataTask.countOfBytesExpectedToReceive+self.startFileSize)), (dataTask.countOfBytesReceived+self.startFileSize), (dataTask.countOfBytesExpectedToReceive+self.startFileSize), self.bytesPerSec);
        }
        [self save:data];
    } else if (response.statusCode == 206) {
        /*断点续传后,一直走206*/
        if (self.progressBlock) {
            self.progressBlock(((float)(dataTask.countOfBytesReceived+self.startFileSize)/(float)(dataTask.countOfBytesExpectedToReceive+self.startFileSize)), (dataTask.countOfBytesReceived+self.startFileSize), (dataTask.countOfBytesExpectedToReceive+self.startFileSize), self.bytesPerSec);
        }
        [self save:data];
    }
}
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/*存储数据,将offset标到文件末尾,在末尾写入数据,最后关闭文件*/
- (void)save:(NSData *)data

使用

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urlStr = @"https://central.github.com/deployments/desktop/desktop/latest/darwin";
urlStr1 = @"http://mac.yxdownload.com/bmc/VMwareFusionpro1012.dmg";

/*开始下载
继续下载*/
- (IBAction)start:(id)sender {
    __weak __typeof(self)weakSelf = self;
    [WhdeBreakPoint asynDownloadWithUrl:urlStr progressBlock:^(float progress, long long receiveByte, long long allByte, long long rate) {
        weakSelf.progressView.progress = progress;
        weakSelf.progressLabel.text = [NSString stringWithFormat:@"%d%%  %@/%@ %@ ", (int)(progress*100), [WhdeNetworkService format:receiveByte], [WhdeNetworkService format:allByte], [WhdeNetworkService format:rate]];
    } successBlock:^(NSString *filePath) {
        NSLog(@"%@", filePath);
    } failureBlock:^(NSString *filePath, NSError *error) {
        NSLog(@"%@\n%@", filePath, error);
    }];
    [WhdeBreakPoint asynDownloadWithUrl:urlStr1 progressBlock:^(float progress, long long receiveByte, long long allByte, long long rate) {
        weakSelf.progressView1.progress = progress;
        weakSelf.progressLabel1.text = [NSString stringWithFormat:@"%d%%  %@/%@ %@ ", (int)(progress*100), [WhdeNetworkService format:receiveByte], [WhdeNetworkService format:allByte], [WhdeNetworkService format:rate]];
    } successBlock:^(NSString *filePath) {
        NSLog(@"%@", filePath);
    } failureBlock:^(NSString *filePath, NSError *error) {
        NSLog(@"%@\n%@", filePath, error);
    }];
}

- (IBAction)pause:(id)sender {
    [WhdeBreakPoint pause:urlStr];
    [WhdeBreakPoint pause:urlStr1];
}

- (IBAction)delete:(id)sender {
    [WhdeFileManager deleteFile:[NSURL URLWithString:urlStr]];
    [WhdeFileManager deleteFile:[NSURL URLWithString:urlStr1]];
    self.progressView.progress = 0;
    self.progressView1.progress = 0;
    self.progressLabel.text = @"0%";
    self.progressLabel1.text = @"0%";
}