LDDownloader

网络文件下载，使用NSURLSession支持断点续传

使用方法：

[[LDDownloadManager sharedInstance] download:self.url progress:^(NSInteger receivedSize, NSInteger expectedSize, CGFloat progress) {
    dispatch_async(dispatch_get_main_queue(), ^{
        self.progressView.progress = progress;
        NSLog(@"progress==%f",progress);
    });
} state:^(FileDownloadState state) {
    dispatch_async(dispatch_get_main_queue(), ^{
        [self refreshButtonWithDownloadState:state];
    });
} completionHandler:^(NSString * _Nonnull filePath, NSError * _Nonnull error) {
    
}];

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