iOS - 小文件下载篇(下载完写入文件)

来源：互联网发布：如何成为一个网络作家编辑：程序博客网时间：2024/05/21 23:34

需要先签 NSURLConnectionDataDelegate协议

- (void)viewDidLoad {

[superviewDidLoad];

NSString *urlString =@"http://120.25.226.186:32812/resources/videos/minion_15.mp4";

NSURL *url = [NSURLURLWithString:urlString];

// 下载操作

[NSURLConnectionconnectionWithRequest:[NSURLRequestrequestWithURL:url]delegate:self];

}

#pragma mark - <NSURLConnectionDataDelegate>

// 下载开始

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSHTTPURLResponse *)response {

// 需要下载文件的总长度

self.contentLength = [response.allHeaderFields[@"Content-Length"]integerValue];

// 文件数据

self.fileData = [NSMutableDatadata];

}

// 下载进行中

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

[self.fileDataappendData:data];

CGFloat progress =1.0 *self.fileData.length /self.contentLength;

NSLog(@"已下载：%.2f%%", (progress) *100);

self.progressView.progress = progress;

}

// 下载完成

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

NSLog(@"下载完毕");

//将文件写入沙盒中

// 缓存文件夹

NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES)lastObject];

// 文件路径

NSString *file = [cachesstringByAppendingPathComponent:@"minion_15.mp4"];

// 写入数据

[self.fileDatawriteToFile:fileatomically:YES];

self.fileData =nil;

}

一个小例子, 可以没事的时候理解一下～

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