OC网络下载

- (void)viewDidLoad {

[super viewDidLoad];

NSURL *url = [NSURL URLWithString:@"http://img4q.duitang.com/uploads/item/201501/13/20150113172039_Ea5ry.jpeg"];

//可以自己指定临时文件的路径

//    NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject]stringByAppendingPathComponent:@"tmppic"];

//    NSURLCache *urlCache = [[NSURLCache alloc]initWithMemoryCapacity:4*1024*1024 diskCapacity:20*1024*1024 diskPath:filePath];

NSURLSessionConfiguration *defaultConfig = [NSURLSessionConfiguration defaultSessionConfiguration];

//    defaultConfig.URLCache = urlCache;

NSURLSession *session = [NSURLSession sessionWithConfiguration:defaultConfig delegate:nil delegateQueue:[NSOperationQueue mainQueue]];

NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {

//location 临时文件路径

NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject]stringByAppendingPathComponent:@"image"];

NSLog(@"%@",filePath);

//将FilePath转化为NSURL类型

NSURL *fileUrl = [NSURL fileURLWithPath:filePath];

//将location 文件的内容拷贝到fileurl

[[NSFileManager defaultManager] copyItemAtURL:location toURL:fileUrl error:nil];

}];

[downloadTask resume];

}