对大文件的断点续传

女爷i 2022-08-10 00:39 44阅读 0赞

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");  
\}