[iOS]网络编程专题:使用NSConnection下载数据
使用NSConnection下载数据1.创建NSConnection对象，设置委托对象
NSMutableURLRequest *request = ]];
;
2. NSURLConnection delegate委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;
3. 实现委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
// store data
; //通常在这里先清空接受数据的缓存
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
/* appends the new data to the received data */
; //可能多次收到数据，把新的数据添加在现有数据最后
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
// 错误处理
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// disconnect
.networkActivityIndicatorVisible = NO;
NSString *returnString = [ initWithData:self.receivedData encoding:NSUTF8StringEncoding];
NSLog(returnString);
data:self.receivedData];
firstTimeDownloaded = YES;
}
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