oc调用rest api

无需其他类库

1: - (IBAction)callapi:(id)sender {

];

   3:     NSURLRequest *request=[NSURLRequest requestWithURL:url];

   4:     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

//json

   6:         NSDictionary *r=[NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];

int cnt=[r count];

,cnt);

,cnt];

  10:  

//string

//NSString *str=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

//NSLog(str);

//[self resultlbl].text=r[0][0];

  15:     }];

  16: }