Question

我知道只获取Json的数据。但我需要如何获取两个json url的数据。我有两个Urls和两个MutableArrays。每次我只能处理一个这样的URL： -

NSURL * url=[NSURL URLWithString:@" url"];
NSURLRequest *req=[NSURLRequest requestWithURL:url];
connection=[NSURLConnection connectionWithRequest:req delegate:self];
if(connection)
{
   NSLog(@"Connected");
   webData=[[NSMutableData alloc]init];
   NSLog(@"Connected2");
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{

    return arrayfirst.count;

}

- (NSString *)pickerView:(UIPickerView *)pickerView
             titleForRow:(NSInteger)row
            forComponent:(NSInteger)component
{
    return arrayfirst[row];
}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row
      inComponent:(NSInteger)component
{

    one.text = arrayfirst[row];
}

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

            NSMutableArray *al=[NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];

            NSLog(@"the array is %@",al);

            for(NSArray *arr in al)
            {
                [arrayfirst addObject:[arr objectAtIndex:1]];
            }
  }

请告诉我如何处理两个Json网址。我有两个网址BusinessCategory和BusinessLocation我有两个MutableArrays arrayfirst和arraysecond。我知道BusinessCategory数据传递给arrayfirst。但我不知道如何处理。

Answer 1

您必须创建两个NSURL连接并在委托中处理响应。

So, in your header file you can have:

NSURLConnection *conn1;
NSURLConnection *conn2;
NSMutableArray *arrayFirst;
NSMutableArray *arraySecond;

In the implementation file:

//Connection 1
NSURL *url1=[NSURL URLWithString:@"yourjsonurl1"];
NSURLRequest *request1 = [NSURLRequest requestWithURL:url1];
conn1=[[NSURLConnection alloc] initWithRequest:request1 delegate:self];

//Connection 2
NSURL *url2=[NSURL URLWithString:@"yourjsonurl2"];
NSURLRequest *request2 = [NSURLRequest requestWithURL:url2];
conn2=[[NSURLConnection alloc] initWithRequest:request2 delegate:self];

//In your delegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    if (connection==conn1) {
        arrayFirst = [[NSMutableData alloc]init];
    }
    else if (connection==conn2){
        arraySecond = [[NSMutableData alloc]init];
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    if (connection==conn1) {
        [arrayFirst appendData:data];
    }
    else if (connection==conn2){
        [arraySecond appendData:data];
    }
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    if (connection==conn1) {
       NSLog(@"SOMETHING WENT WRONG WITH URL1");
    }
    else if (connection==conn2){
        NSLog(@"SOMETHING WENT WRONG WITH URL2");
    }
}

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

    if (connection==conn1) {
       NSLog(@"DONE WITH URL1");
    }
    else if (connection==conn2){
        NSLog(@"DONE WITH URL2");
    }
}

更短（也许更好）的方法是在异步操作中运行它：

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    NSData *result = [NSData dataWithContentsOfURL:"yourURL"];
    id jsonResult;
    if ([result length] != 0) { jsonResult = [NSJSONSerialization JSONObjectWithData:result options:0 error:nil];}
    dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"done!");
    });
});

如何在iOS中获取两个json url的数据

1 个答案: