视频转换网站：硕鼠
#import "ViewController.h"
@interface ViewController ()<NSURLSessionDataDelegate,NSURLSessionDelegate,NSURLSessionTaskDelegate>
{
NSMutableData *_datas;
NSURLSession *_session;
NSURLSessionDataTask *_task;
NSString *_path;
NSString *_basePath;
NSFileHandle *_writeHandle;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_basePath = @"/Users/apple/Desktop";
_datas = [NSMutableData data];
_path = @"http://www.3337973.cc/imgall/mjuxu2djfy2diojtfzrw63i/uploads/allimg/140828/3-140RQ34K1.jpg";
_path = @"http://link.hhtjim.com/163/280761.mp3";
// _path = @"http://data.vod.itc.cn/?rb=1&prot=1&key=jbZhEJhlqlUN-Wj_HEI8BjaVqKNFvDrn&prod=flash&pt=1&new=/198/232/8mIXFONKIQNHKlScaM76kB.mp4";
_session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration ephemeralSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
//断点续传，把Request定义为可变，这样才可以把"Range"的值传到服务器
NSMutableURLRequest *mutiRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:_path]];
//断点续传，把bytes设置成读本地的文件大小下载了多少，然后就可以接着下载
[mutiRequest setValue:@"bytes=1048000-" forHTTPHeaderField:@"Range"];
_task = [_session dataTaskWithRequest:mutiRequest];
// [_task resume];
}
//1 请求下载
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler{
NSHTTPURLResponse *resp = (NSHTTPURLResponse*)response;
NSLog(@"%lld",resp.expectedContentLength);
NSLog(@"--->%@",response);
// 断点续传，状态码要加上206
if(resp.statusCode == 200 || resp.statusCode == 206){
completionHandler(NSURLSessionResponseAllow);
}
}
//2 下载任务
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data{
NSLog(@"-->%ld",data.length);
//进度条
_myProgress.progress =(double)_currentLength/_tatalLength;
//文字显示进度
_dLabel.text = [NSString stringWithFormat:@"下载进度%f",(double)_currentLength/_tatalLength];
if(_writeHandle){
[_writeHandle writeData:data];
}
}
//3 判断错误
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didCompleteWithError:(nullable NSError *)error{
if(!error){
NSLog(@"done");
//AtPath: 剪切前的文件地址 ToPath: 剪切后的文件地址
[[NSFileManager defaultManager]moveItemAtPath:[_basePath stringByAppendingPathComponent:[self cacheFileNameWithFile:[self fileNameWithURL:_path]]] toPath:[_basePath stringByAppendingPathComponent:[self fileNameWithURL:_path]] error:nil];
}else{
NSLog(@"error:%@",error);
}
[_writeHandle closeFile];
}
- (IBAction)buttonClicked:(UIButton*)sender {
if([sender.currentTitle isEqualToString:@"开始"]){
NSString *targetFilePath = [_basePath stringByAppendingPathComponent:[self cacheFileNameWithFile:[self fileNameWithURL:_path]]];
if(![[NSFileManager defaultManager]fileExistsAtPath:targetFilePath isDirectory:nil]){
//如果没有目标文件就创建一个
[[NSFileManager defaultManager]createFileAtPath:targetFilePath contents:nil attributes:nil];
}
//打开NSFileHandle通道
_writeHandle = [NSFileHandle fileHandleForWritingAtPath:targetFilePath];
[_writeHandle seekToEndOfFile];
if(_task.state == NSURLSessionTaskStateSuspended){
[_task resume];
}else{
//继续下载
_task = [_session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:_path]]];
[_task resume];
}
NSLog(@"开始");
}
else{//暂停
if(_task.state == NSURLSessionTaskStateRunning){
[_task suspend];
NSLog(@"暂停");
}
}
}
//文件名 分割/号里面内容为数组，取最后一个元素作为名字
- (NSString*)fileNameWithURL:(NSString*)urlString{
if(!urlString){
return nil;
}
NSArray *tempArray = [urlString componentsSeparatedByString:@"/"];
NSString *fileName = tempArray.lastObject;
return fileName;
}
//缓存名 用.=号分割fileName，取第一个元素做缓存名
- (NSString*)cacheFileNameWithFile:(NSString*)fileName{
if(!fileName){
return nil;
}
NSArray *tempArr = [fileName componentsSeparatedByString:@"."];
NSString *tempString = tempArr.firstObject;
return [NSString stringWithFormat:@"%@.cache",tempString];
}
@end
