如何以高效，快捷的方式从服务器获取json数据。 [英] How to GET json data from server in an efficient and faster way.?

问题描述

Hey folks, I've the following code to get data from server but it takes too long to load and show in tableView. I need it to be done in faster way.
I have my NSURLRequest in viewDidLoad.

- (void)viewDidLoad {
    
    NSNumber *getID=connectorClass.IdBeingPassed;
    NSString *getname=connectorClass.movieNameBeingPassed;
    
  
    
    NSNumber *getVote=connectorClass.voteBeingPassed;
    NSString *myNumberInString = [getVote stringValue];
    NSString *movieIDinString= [getID stringValue];
       _labelText.text=getname;
    //------castApi----//
    
    
   
    [super viewDidLoad];
    [[self tableView2]setDelegate:self ];
    [[self tableView2]setDataSource:self];
    array=[[NSMutableArray alloc]init];
    
    NSString *castString = [NSString stringWithFormat:@"https://api.themoviedb.org/3/movie/%@/credits?api_key=c4bd81709e87b1208609433c49",movieIDinString];
    NSURL *url=[NSURL URLWithString:castString];

    NSURLRequest *request=[NSURLRequest requestWithURL:url];
    connection=[NSURLConnection connectionWithRequest:request delegate:self];
    if (connection)
    {
        webData=  [[NSMutableData alloc]init];
    }
    
}

我尝试过：

What I have tried:

- (void)viewDidLoad {
    
    NSNumber *getID=connectorClass.IdBeingPassed;
    NSString *getname=connectorClass.movieNameBeingPassed;
    
  
    
    NSNumber *getVote=connectorClass.voteBeingPassed;
    NSString *myNumberInString = [getVote stringValue];
    NSString *movieIDinString= [getID stringValue];
       _labelText.text=getname;
    //------castApi----//
    
    
   
    [super viewDidLoad];
    [[self tableView2]setDelegate:self ];
    [[self tableView2]setDataSource:self];
    array=[[NSMutableArray alloc]init];
    
    NSString *castString = [NSString stringWithFormat:@"https://api.themoviedb.org/3/movie/%@/credits?api_key=c4bd81709e87b1208609433c49",movieIDinString];
    NSURL *url=[NSURL URLWithString:castString];

    NSURLRequest *request=[NSURLRequest requestWithURL:url];
    connection=[NSURLConnection connectionWithRequest:request delegate:self];
    if (connection)
    {
        webData=  [[NSMutableData alloc]init];
    }
    
}

推荐答案

我检查了你的代码。主要问题是您正在主线程中进行服务调用，这会阻止用户界面，因为只要未完成服务调用。用户界面没有出现。执行服务调用的最佳做法是在单独的线程中。您应该尝试多线程编程。对于服务调用/ api调用，他们有很多框架，可以在框架中处理所有内容。最推荐的框架是针对Objective C的AFNetworking和针对Swift的Almofire 。

I checked your code . The main problem is you are doing the service call in the main thread which blocking the User Interface because as long as the service call is not done . UI is not appearing. The best practice of doing the service call is in separate thread . Multi Thread Programming you should try . For service call / api call their are lots of framework which handle everything with in the framework . Most recommended framework is AFNetworking for Objective C and Almofire for Swift .

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