对大文件的断点续传

注：#import "YGFileDownloader.h"是对NSURLConnection的简单封装

#import "YGResumeDownloadViewController.h"

#import "NSString+util.h"
#import "YGFileDownloader.h"

#define URL @"http://dlsw.baidu.com/sw-search-sp/soft/2a/25677/QQ_V4.0.0.1419920162.dmg"

@interface YGResumeDownloadViewController () <YGFileDownloaderDelegate>

@property (weak, nonatomic) IBOutlet UIProgressView *progressView;


@end

@implementation YGResumeDownloadViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
    float progress=[defaults floatForKey:@"self.progressView.progress"];
    if (progress)
    {
        self.progressView.progress=[defaults floatForKey:@"self.progressView.progress"];
    }
}

- (IBAction)download:(id)sender {
    YGFileDownloader *downloader=[YGFileDownloader sharedInstance];
    downloader.delegate=self;
    [downloader start:URL];
}

- (IBAction)pauseDownload:(id)sender {
    [[YGFileDownloader sharedInstance] stop];
}

#pragma mark - <YGFileDownloaderDelegate>
-(void)fileDownloaderFailWithError:(NSError *)error{
    NSLog(@"失败");
}

-(void)fileDownloader:(YGFileDownloader *)downloader downloadSize:(unsigned long long)downloadSize totalSize:(unsigned long long)totalSize{
    self.progressView.progress=1.0*downloadSize/totalSize;
    float p=self.progressView.progress;
    //NSLog(@"进度条:%f",p);
    NSUserDefaults *dafaults=[NSUserDefaults standardUserDefaults];
    [dafaults setFloat:p forKey:@"self.progressView.progress"];
}

-(void)fileDownloaderDidFinishLoad{
    NSLog(@"下载完了");
}