iOS中 断点下载详解 韩俊强的博客
布局如下:
基本拖拉属性:
#import "ViewController.h" #import "AFNetworking.h" @interface ViewController () @property (weak, nonatomic) IBOutlet UILabel *progressLabel; @property (weak, nonatomic) IBOutlet UIProgressView *progressView; @property (nonatomic, strong) AFHTTPRequestOperation *operation; @end @implementation ViewController
调用:
- (void)viewDidLoad { [super viewDidLoad]; NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject; NSString *txtPath = [cachePath stringByAppendingPathComponent:@"mvTemp/mv.txt"]; NSFileManager *fileManager = [NSFileManager defaultManager]; if ([fileManager fileExistsAtPath:txtPath]) { self.progressView.progress = [[NSString stringWithContentsOfFile:txtPath encoding:NSUTF8StringEncoding error:nil] floatValue]; self.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", _progressView.progress * 100]; } else { self.progressView.progress = 0; self.progressLabel.text = @"0%"; } NSLog(@"%@", NSHomeDirectory()); }
点击事件:
- (IBAction)startOrCancelDownLoad:(UIButton *)sender { if ([sender.currentTitle isEqualToString:@"开始下载"]) { [sender setTitle:@"暂停下载" forState:UIControlStateNormal]; NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject; NSString *filePath = [cachePath stringByAppendingPathComponent:@"mv"]; NSString *tempPath = [cachePath stringByAppendingPathComponent:@"mvTemp"]; NSFileManager *fileManager = [NSFileManager defaultManager]; if (![fileManager fileExistsAtPath:filePath]) { [fileManager createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil]; } if (![fileManager fileExistsAtPath:tempPath]) { [fileManager createDirectoryAtPath:tempPath withIntermediateDirectories:YES attributes:nil error:nil]; } NSString *mp4TempPath = [tempPath stringByAppendingPathComponent:@"mv.temp"]; NSString *txtTempPath = [tempPath stringByAppendingPathComponent:@"mv.txt"]; NSString *mp4Path = [filePath stringByAppendingPathComponent:@"mv.mp4"]; NSURL *url = [NSURL URLWithString:@"http://video.szzhangchu.com/1442395443772_5176326090.mp4"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; unsigned long long downLoadBytes = 0; if ([fileManager fileExistsAtPath:mp4TempPath]) { downLoadBytes = [self fileSizeAtPath:mp4TempPath]; NSString *range = [NSString stringWithFormat:@"bytes=%llu-", downLoadBytes]; NSMutableURLRequest *mutableRequest = [request mutableCopy]; [mutableRequest setValue:range forHTTPHeaderField:@"Range"]; request = mutableRequest; } if (![fileManager fileExistsAtPath:mp4Path]) { self.operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [self.operation setOutputStream:[NSOutputStream outputStreamToFileAtPath:mp4TempPath append:YES]]; __weak typeof(self) weakSelf = self; [_operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) { weakSelf.progressView.progress = (float)(totalBytesRead + downLoadBytes) / (float)(totalBytesExpectedToRead + downLoadBytes); weakSelf.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", weakSelf.progressView.progress * 100]; NSString *progress = [NSString stringWithFormat:@"%.3f", weakSelf.progressView.progress]; [progress writeToFile:txtTempPath atomically:YES encoding:NSUTF8StringEncoding error:nil]; }]; [_operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { [fileManager moveItemAtPath:mp4TempPath toPath:mp4Path error:nil]; [fileManager removeItemAtPath:txtTempPath error:nil]; } failure:^(AFHTTPRequestOperation *operation, NSError *error) { }]; [_operation start]; } } else { [sender setTitle:@"开始下载" forState:UIControlStateNormal]; [self.operation cancel]; _operation = nil; } }
- (unsigned long long)fileSizeAtPath:(NSString *)path { unsigned long long fileSize = 0; NSFileManager *fileManager = [NSFileManager defaultManager]; if ([fileManager fileExistsAtPath:path]) { NSError *error = nil; NSDictionary *dict = [fileManager attributesOfItemAtPath:path error:&error]; if (dict && !error) { fileSize = [dict fileSize]; } } return fileSize; }
最终效果如下:
用到的第三方数据请求:AFNetworking,大家应该都有,这里不做介绍
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