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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