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如何在iOS中获取两个json URL的数据

uipickerview uitextfield json ios

user3839375 · 技术社区 · 11 年前

我只知道获取Json的数据。但我需要如何获取两个Json url的数据。我有两个url和两个MutableArrays。有一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 url。我有两个网址 BusinessCategory 和 BusinessLocation 我有两个 MutableArrays arrayfirst 和 arraysecond .我知道 业务类别 数据传递到 第一方阵 。但我不知道怎么处理。

1 回复 | 直到 11 年前

joelrb 11 年前

您必须创建两个NSURL连接并处理委托中的响应。

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");
    }
}

一种更短(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!");
    });
});