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我是iOS新手我想调用google api方向服务并解析它，我知道如何使用post方法调用web服务，但我不知道如何将参数集成到url中，并从中获取json响应。请帮我。

4

2 回答 2

1

要使用 Post 传递数据，NSURLConnection您可以使用setHTTPBody方法。

您可以使用以下代码：

NSURL *aUrl = [NSURL URLWithString:@"yourURL"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:aUrl
                                         cachePolicy:NSURLRequestUseProtocolCachePolicy
                                     timeoutInterval:60.0];

NSURLConnection *connection= [[NSURLConnection alloc] initWithRequest:request 
                                                             delegate:self];

[request setHTTPMethod:@"POST"];
NSString *postString = @"username=Midhun&password=Midhun";
[request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];

并且可以通过didReceiveData委托方法获取响应数据。您需要将接收到的数据附加到NSMutableData对象以供进一步使用。

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{ 
   [receivedData appendData:data];
}
于 2012-12-22T12:59:16.413 回答
1

请看下面的代码，你会有所了解。

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
dispatch_async(queue, ^{
    NSString *stringOrigin = @"Surandai";
    NSString *stringDestination = @"Coimbatore";
    NSData *dataDirection = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=true", stringOrigin, stringDestination]]];
    NSDictionary *dictionaryDirection = [NSJSONSerialization JSONObjectWithData:dataDirection options:NSJSONReadingAllowFragments error:nil];
    dispatch_sync(dispatch_get_main_queue(), ^{
        NSLog(@"dictionaryDirection - %@", dictionaryDirection);
        //Do UI update here
    });
});
于 2012-12-22T13:09:16.167 回答