NSURLConnection大文件下载：
-(void)download
{
//1.url
// NSURL *url = [NSURL URLWithString:@"http://imgsrc.baidu.com/forum/w%3D580/sign=54a8cc6f728b4710ce2ffdc4f3cec3b2/d143ad4bd11373f06c0b5bd1a40f4bfbfbed0443.jpg"];
NSURL*url = [NSURLURLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"];
//2.创建请求对象
NSURLRequest*request = [NSURLRequestrequestWithURL:url];
//3.发送请求
[[NSURLConnectionalloc]initWithRequest:requestdelegate:self];
}
#pragma mark NSURLConnectionDataDelegate
-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response
{
NSLog(@"didReceiveResponse");
//1.得到文件的总大小(本次请求的文件数据的总大小)
self.totalSize= response.expectedContentLength;
//2.写数据到沙盒中
self.fullPath= [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES)lastObject]stringByAppendingPathComponent:@"123.mp4"];
NSLog(@"%@",_fullPath);
//3.创建一个空的文件
[[NSFileManagerdefaultManager]createFileAtPath:self.fullPathcontents:nilattributes:nil];
//4.创建文件句柄(指针)
self.handle= [NSFileHandlefileHandleForWritingAtPath:self.fullPath];
}
-(void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
{
//1.移动文件句柄到数据的末尾
[self.handleseekToEndOfFile];
//2.写数据
[self.handlewriteData:data];
//3.获得进度
self.currentSize+= data.length;
//进度=已经下载/文件的总大小
NSLog(@"%f",1.0*self.currentSize/self.totalSize);
self.progressView.progress=1.0*self.currentSize/self.totalSize;
//NSLog(@"%@",self.fullPath);
}
-(void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
{
}
-(void)connectionDidFinishLoading:(NSURLConnection*)connection
{
//1.关闭文件句柄
[self.handlecloseFile];
self.handle=nil;
NSLog(@"connectionDidFinishLoading");
NSLog(@"%@",self.fullPath);
}
