先獲得寫入的路徑：
self.filepath = [[networkmanager sharedinstance] pathfortemporaryfilewithprefix:@"get"];- (nsstring *)pathfortemporaryfilewithprefix:(nsstring *)prefix
建立寫入流，並開啟流
assert(self.filepath != nil);
assert(self.filestream != nil);
[self.filestream open];
傳送url請求
request = [nsurlrequest requestwithurl:url];
assert(request != nil);
self.connection = [nsurlconnection connectionwithrequest:request delegate:self];
assert(self.connection != nil);
實現**方法，將檔案寫入到臨時目錄
- (void)connection:(nsurlconnection *)theconnection didreceivedata:(nsdata *)data
else
} while (byteswrittensofar != datalength);
}
還有寫**方法也要去實現，例如：
- (void)connectiondidfinishloading:(nsurlconnection *)theconnection
- (void)connection:(nsurlconnection *)theconnection didfailwitherror:(nserror *)error
- (void)connection:(nsurlconnection *)theconnection didreceiveresponse:(nsurlresponse *)response
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