如何获得 php web method的返回

[clear_zero]

我有个php web method返回（比如 url = ""，yes 或者 no

在xcode7里面怎么写才能取得返回值呢，我写了如下代码。但是没得到东西

NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.test.com/test.php?variable=test1"]
                                          cachePolicy:NSURLRequestUseProtocolCachePolicy
                                      timeoutInterval:60.0];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection) {
    NSMutableData *receivedData = [NSMutableData data];
    NSString *strData = [[NSString alloc]initWithData:receivedData encoding:NSUTF8StringEncoding];
    NSLog(@"This is the response: %@", strData);
}else {
 }

求指点，谢谢

[conan_o_0]

你创建了一个receiveData 但是receiveData没有赋值?