iOS网络请求 NSURLConnection

URLConnection的几种用法

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/*
触发
*/
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
  [self async];
}
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/**

 Get请求-同步

 */
- (void) sync{
  NSURL* url = [NSURL URLWithString:@"https://tianqiapi.com/api?version=v1&appid=53827541&appsecret=sIY6i0fQ"];

  NSURLRequest *request = [[NSURLRequest alloc]initWithURL: url];

  NSHTTPURLResponse * response = **nil**;

  NSData *data = [NSURLConnection sendSynchronousRequest:request

                     returningResponse: &response

                           error: **nil**];

  NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);

  NSLog(@"%zd",response.statusCode);

}
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/**

 Get请求-同步

 */

- (void)async{

  NSURL* url = [NSURL URLWithString:@"https://tianqiapi.com/api?version=v1&appid=53827541&appsecret=sIY6i0fQ"];

  NSURLRequest *request = [[NSURLRequest alloc]initWithURL: url];

  [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * *connectionError) {
    NSString *result = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    result = [self stringByReplaceUnicode:result];
    NSLog(@"%@",result);
    NSHTTPURLResponse* res = (NSHTTPURLResponse*)response;
    NSLog(@"%zd",res.statusCode);     

  }];

}
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/*
Get请求-代理
*/
//实现协议 <NSURLConnectionDataDelegate>

- (void)delegate{

  NSURL* url = [NSURL URLWithString:@"https://tianqiapi.com/api?version=v1&appid=53827541&appsecret=sIY6i0fQ"];

  NSURLRequest *request = [[NSURLRequest alloc]initWithURL: url];

  [NSURLConnection connectionWithRequest:request delegate:self];

}
/*
协议对应的方法
*/
#pragma mark -NSURLConnectionDataDelegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    NSLog(@"%s",__func__);
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    NSLog(@"%s",__func__);
    [self.resultData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"%s",__func__);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{
    NSLog(@"%s",__func__);
    NSLog(@"%@",[[NSString alloc]initWithData:_resultData encoding:NSUTF8StringEncoding]);
    
}