Question

在我的项目中，我在同一个班级使用2个api。并且我想使用NSURLRequest获取数据，在第一个api我获得经度的纬度经度并将这些纬度经度放在第二个网址上以获得这些地方之间的距离，但我与每个地方的距离相同

这是我的代码。

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    currentLocation = newLocation;

    if (currentLocation != nil){

        NSString *str=[NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/place/search/json?location=%f,%f&radius=2000&types=%@&sensor=false&key=API Key",currentLocation.coordinate.latitude,currentLocation.coordinate.longitude,strCatText];
        [self createTheConnection:str];
        //[self createTheConnection1:str1];

        arrAllData=[[NSMutableArray alloc]init];
        int i;
        for (i=0; i<=2; i++)
        {
            NSString *strname=[[[arr valueForKey:@"results"] objectAtIndex:i] valueForKey:@"name"];
            NSString *strvicinity=[[[arr valueForKey:@"results"] objectAtIndex:i] valueForKey:@"vicinity"];
            NSString *strRef=[[[arr valueForKey:@"results"]objectAtIndex:i]valueForKey:@"reference"];
            NSString *strLat=[[[[[arr valueForKey:@"results"] objectAtIndex:i] valueForKey:@"geometry"] valueForKey:@"location"] valueForKey:@"lat"];
            NSString *strLng=[[[[[arr valueForKey:@"results"] objectAtIndex:i] valueForKey:@"geometry"] valueForKey:@"location"] valueForKey:@"lng"];

            int j;
            for (j=0; j<=0; j++)
            {
               NSString *str1=[NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%f,%f&destination=%@,%@&sensor=false&mode=driving",currentLocation.coordinate.latitude,currentLocation.coordinate.longitude,strLat,strLng];
                //NSLog(@"%@",str1);
                [self createTheConnection1:str1];

              //  if (![strLat isEqual:@"0"]) {
               //   strDistance=@"";
                  NSString *strDistance=[[[[[[arr2 valueForKey:@"routes"] objectAtIndex:0] valueForKey:@"legs"] objectAtIndex:0] valueForKey:@"distance"] valueForKey:@"text"];
               // NSLog(@"%@",strDistance);
                //}

                if(strname == nil){
                    strname = [NSString stringWithFormat:@"%@", [NSNull null]];
                }
                if(strvicinity == nil){
                    strvicinity = [NSString stringWithFormat:@"%@", [NSNull null]];
                }
                if(strRef == nil){
                    strRef = [NSString stringWithFormat:@"%@", [NSNull null]];
                }
                if(strDistance == nil){
                    strDistance = [NSString stringWithFormat:@"%@", [NSNull null]];
                }

                if (![strDistance isEqual:@"<null>"]) {
                    arrdata=[[NSMutableArray alloc]initWithObjects:strname,strvicinity,strRef,strDistance, nil];
                    strDistance=nil;

                    [arrAllData addObject:arrdata];
                }       

            }          
           [tblView reloadData];  
        } 
    }



-(void)createTheConnection:(NSString*)strUrl
{    
    NSMutableURLRequest *request=[[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:[strUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]];

    connections=[[NSURLConnection alloc]initWithRequest:request delegate:self];

    if(connections)
    {
        webData=[NSMutableData data];

    }

}

-(void)createTheConnection1:(NSString*)strUrl1
{

    NSMutableURLRequest *request1=[[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:[strUrl1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]];

    connections1=[[NSURLConnection alloc]initWithRequest:request1 delegate:self];

    if(connections1)
    {
        webData1=[NSMutableData data];

    }

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

    //  //NSLog(@"%@",error);

    self.navigationItem.leftBarButtonItem=nil;

}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    if (connection==connections) {
        [webData appendData:data];
    }
    if (connection==connections1) {
        [webData1 appendData:data];
    }


}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    if (connection==connections) {
        [webData setLength:0];
    }
    if (connection==connections1) {
        [webData1 setLength:0];
    }


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

    NSError *err;   
    if (connection==connections) {
        arr=[NSJSONSerialization JSONObjectWithData:webData options:NSJSONReadingMutableContainers error:&err];
    }
    if (connection==connections1) {
        arr2=[NSJSONSerialization JSONObjectWithData:webData1 options:NSJSONReadingMutableContainers error:&err];      
    }  
}


-(void)barBtnItem1{
    MapViewController *mvc =[self.storyboard instantiateViewControllerWithIdentifier:@"mapview"];
    [UIView beginAnimations:@"Start" context:nil];
    [UIView setAnimationDuration:0.80];
    [UIView setAnimationCurve: UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO];
    [self.navigationController pushViewController:mvc animated:YES];
    [UIView commitAnimations];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return arrAllData.count;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"cell"];
    UILabel *lblName=(UILabel*)[cell viewWithTag:100];
    UILabel *lblAddress=(UILabel*)[cell viewWithTag:101];
    UILabel *lblDistance=(UILabel*)[cell viewWithTag:102];
    arrData11=[arrAllData objectAtIndex:indexPath.row];
    NSString *strName=[NSString stringWithFormat:@"%@",arrData11[0]];
    NSString *strAddress=[NSString stringWithFormat:@"%@",arrData11[1]];
    NSString *strDistance1=[NSString stringWithFormat:@"%@",arrData11[3]];
    if ([strName isEqual:@"<null>"]) {
//        lblName.text=@"Loading...";
//        lblAddress.text=@"Loading...";
    }
    else{
        lblName.text=strName;
        lblAddress.text=strAddress;
        lblDistance.text=strDistance1;
    }
        return cell;
}

Answer 1

您正在创建两个连接，当他们接收数据时，他们正在调用代理，但在您的应用程序中，您没有等待从第一个请求获取数据，然后发出第二个请求。我很确定你得到的距离是第二个纬度和长度的距离。

单独请求这些数据并查看您获得的距离。并尝试逐一提出请求。即发出第一个请求..获取数据..然后发出第二个请求。因为他们使用相同的委托来初始化数据。

修改我在移动设备中，所以我无法帮助您编写代码。我试试看..

Method A (take parameter that you need to make a url request) { //Make request with pair of lat and long and necessary datas } (void)connectionDidFinishLoading:(NSURLConnection *)connection{ ........ //After getting the data Call method A with next pair of lat long You can determine next pair by maintaining a global variable. }

让我知道这有助于......：）

使用多个网址时，使用NSURLRequest获取错误的数据

1 个答案: