NSURLConnection 사용하기

NSURLConnection, NSURLConnectionDelegate 사용 예제

다음 코드는 야후 Weather API를 사용하여 데이터를 받아오는 것을 구현

Delegate 메소드

1)데이터 수신

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

2)연결 오류

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

3)연결 종료

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

#pragma mark -

#pragma mark Custom Methods

- (void)loadData {

    NSLog(@"loadData");

    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

    NSURL *weatherURL = [[NSURL alloc] initWithString:@"http://weather.yahooapis.com/forecastrss?w=2502265"];

    NSURLConnection *URLConnection = [[NSURLConnection alloc] initWithRequest:[NSURLRequest requestWithURL:weatherURL] delegate:self];

    [URLConnection release];

    [weatherURL release];

}

#pragma mark -

#pragma mark NSURLConnectionDelegate

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    NSLog(@"connection:didReceiveData:");

    if (receiveData == nil) {

        receiveData = [[NSMutableData alloc] init];

    }

    [receiveData appendData:data];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {

    NSLog(@"connection:didFailWithError:");

    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

    [receiveData release];

    receiveData = nil;

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSLog(@"connectionDidFinishLoading:");

    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

    NSString *receiveString = [[[NSString alloc] initWithData:receiveData encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingEUC_KR)] autorelease];

    NSLog(@"%@", receiveString);

    [receiveData release];

    receiveData = nil;

}