How to Make REST api call in Objective-C.

We can call using this.
NSString *twitterUrl = @"YourUrlString";
NSString *resp = [self makeRestAPICall: twitterUrl];

and method is
-(NSString*) makeRestAPICall : (NSString*) reqURLStr
{
    NSURLRequest *Request = [NSURLRequest requestWithURL:[NSURL URLWithString: reqURLStr]];
    NSURLResponse *resp = nil;
    NSError *error = nil;
    NSData *response = [NSURLConnection sendSynchronousRequest: Request returningResponse: &resp error: &error];
    NSString *responseString = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
    NSLog(@"%@",responseString);
    return responseString;
}

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@interface ViewController : UIViewController<NSURLConnectionDelegate> {     NSMutableData *_responseData; }