我是ios领域的新人，现在我正在尝试实现基于MKMapView的iPhone应用程序。从 Google Map Web Web 服务中获取 JSON 输出格式的数据。
- (void)update {
self.responseData=[NSMutableData data];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://maps.googleapis.com/maps/api/directions/json?origin=Ernakulam&destination=Kanyakumari&mode=driving&sensor=false"]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
[self.responseData setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[self.responseData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
[connection release];
self.responseData =nil;
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSLog(@"connection established");
[connection release];
NSString *responseString=[[NSString alloc]initWithData:self.responseData encoding:NSUTF8StringEncoding];
self.responseData=nil;
NSLog(@" OUTPUT JSON DATA^^^^^^^^^^^^^^^^%@",responseString);
}
我得到了 JSON 格式的输出。现在我想绘制这两个位置之间的路线。我如何从 JSON 输出数据中分离出所有纬度和经度点。
最佳答案
查看此代码。我正在使用 JSONkit 进行解析
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
NSLog(@"connection established");
[connection release];
NSString *responseString=[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
NSMutableDictionary *data1 = [responseData objectFromJSONData];
NSMutableArray *ad = [data1 objectForKey:@"routes"];
NSMutableArray *data2 = [[ad objectAtIndex:0] objectForKey:@"legs"];
NSMutableArray *data3 = [[data2 objectAtIndex:0] objectForKey:@"steps"];
// NSLog(@"Data3 %@", data3);
for(int i = 0; i<data3.count;i++){
NSLog(@"Start %@", [[data3 objectAtIndex:i] objectForKey:@"start_location"]);
NSLog(@"End %@", [[data3 objectAtIndex:i] objectForKey:@"end_location"]);
}
}
关于ios - 如何从 JSON 输出数据中解码路线点？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10100110/