如何在 iOS 中获取两个 json url 的数据

Posted 2023-02-24

【中文标题】如何在 iOS 中获取两个 json url 的数据

【英文标题】：how to get data for Two json urls in iOS

【发布时间】：2014-07-24 07:31:03

【问题描述】：

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。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 url。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。但是不知道怎么处理。

【问题讨论】：

请说明您想问什么？更具体。

@Xeieshan 我有两个 UITextFields，我有 UIpickerview 和两个 json urls.json 数据传递给基于 textFileds 的 uipickerview 所以请给我任何想法

【参考方案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");
    

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!");
    );
);

【讨论】：

我按照你说的尝试过，但是在 connectionDidFinishLoading 中我尝试过这样 if (connection==con1) NSLog(@"DONE WITH URL1"); NSMutableArray *al=[NSJSONSerialization JSONObjectWithData:webData options:0 error:nil]; NSLog(@"第一个数组是 %@",al); else if (connection==con2) NSLog(@"DONE WITH URL2"); NSMutableArray *al2=[NSJSONSerialization JSONObjectWithData:webData2 options:0 error:nil]; NSLog(@"第二个数组是 %@",al2);但它只显示第二个数组第一个数组数据不显示所以请给出任何想法