首先我們準(zhǔn)備一些準(zhǔn)備工作新建一個(gè)singleView工程,然后如圖所示

heiyu.png

heiyu.png

如圖所示,我們新建一個(gè)名字叫URL的headFile文件,方便以后調(diào)用接口

關(guān)于網(wǎng)絡(luò)數(shù)據(jù)解析iOS9.0之后已經(jīng)棄用NSConnection不過還是能用,不過推薦使用NSSession.
由于代理比較麻煩,所以這里只整理block

NSURLConnection解析

// #pragma mark - post同步請求

 //1.創(chuàng)建url
 NSURL *url = [NSURL URLWithString:POST_URL];
     
 
 //2.創(chuàng)建網(wǎng)絡(luò)請求 [post請求必須初始化為可變請求，因?yàn)樯院笠M(jìn)行一些內(nèi)容的設(shè)置]
 NSMutableURLRequest *mutableRequest = [NSMutableURLRequest requestWithURL:url];
 
 //2.5設(shè)置body
 //創(chuàng)建一個(gè)連接字符串（這個(gè)內(nèi)容在以后的開發(fā)中接口文檔都有標(biāo)注）
 NSString *dataString = POST_BODY;
 
 //對連接字符串進(jìn)行編碼【這一步千萬不能忘記】
 NSData *postData = [dataString `dataUsingEncoding:NSUTF8StringEncoding];
 
 //設(shè)置請求格式為POST請求  [在這個(gè)地方后邊POST必須全大寫]
 [mutableRequest setHTTPMethod:@"POST"];
 
 //設(shè)置請求體（body）
 [mutableRequest setHTTPBody:postData];
 
 
 //3.連接服務(wù)器
 NSData *data = [NSURLConnection sendSynchronousRequest:mutableRequest returningResponse:nil error:nil];
 
 //4.進(jìn)行json數(shù)據(jù)解析
 NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
 
 NSLog(@"dic = %@",dic);

// #pragma mark - get同步請求

 // 1.創(chuàng)建URL
NSURL *url = [NSURL URLWithString:GET_URL];
// 2.創(chuàng)建網(wǎng)絡(luò)請求
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:20];
// 3.連接服務(wù)器
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
// 4.解析數(shù)據(jù)
NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
NSLog(@"dic = %@",resultDic);

// #pragma mark - post異步請求(block)

 //1.創(chuàng)建url
    NSURL *url = [NSURL URLWithString:POST_URL];
// 2.創(chuàng)建網(wǎng)絡(luò)請求
    NSMutableURLRequest *mRequest= [NSMutableURLRequest requestWithURL:url];
    
//2.5創(chuàng)建body
    NSString *string = POST_BODY;
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    [mRequest setHTTPMethod:@"POST"];
    [mRequest setHTTPBody:data];
//3.鏈接服務(wù)器
    [NSURLConnection sendAsynchronousRequest:mRequest queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        if (connectionError == nil) {
            
//4.數(shù)據(jù)解析
    NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            NSLog(@"%@", dict);
        }
    }];

// #pragma mark - get異步請求(block)

//1.創(chuàng)建url
NSURL *url = [NSURL URLWithString:GET_URL];
    
//2.創(chuàng)建請求
NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
//3.鏈接服務(wù)器
    //方法一：Block方法實(shí)現(xiàn)
    //第一個(gè)參數(shù)：請求對象
    //第二個(gè)參數(shù)：線程隊(duì)列
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        //response是攜帶的接口信息
        //data請求下來的數(shù)據(jù)，接下來會(huì)使用到的
        //connectionError錯(cuò)誤信息
        if (connectionError == nil) {
//4.解析
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];        
            NSLog(@"dic = %@",dic);     
            //先開辟子線程解析數(shù)據(jù)
            //然后在主線程里刷新UI
        }
    }];

NSURLSession解析

// #pragma mark - get同步請求

//1.創(chuàng)建url
    NSURL *url = [NSURL URLWithString:GET_URL];
//2.創(chuàng)建session對象
    NSURLSession *session = [NSURLSession sharedSession];
//3.創(chuàng)建task請求任務(wù)
    //NSURLSession是基于任務(wù)去完成相關(guān)的事件的
    //NSURLSessionTask所有的任務(wù)均放在這個(gè)里邊實(shí)現(xiàn)
    NSURLSessionTask *task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
//4.解析相關(guān)的數(shù)據(jù)
        if (error == nil) {
            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            NSLog(@"dic = %@",dic);
        }   
    }]; 
//5.核心步：啟動(dòng)任務(wù)【千萬不能忘記】
//原因：NSURLSessionTask實(shí)例出來的任務(wù)處于掛起狀態(tài)，如果不啟動(dòng)，不會(huì)走block中的實(shí)現(xiàn)內(nèi)容
    [task resume]; 

// #pragma mark - post異步請求

    //1.創(chuàng)建url
    NSURL *url = [NSURL URLWithString:POST_URL];
    
    //2.創(chuàng)建請求
    NSMutableURLRequest *mutableRequest = [NSMutableURLRequest requestWithURL:url];
    
    //2.5核心設(shè)置body
    NSString *bodyString = POST_BODY;
    
    NSData *postData = [bodyString dataUsingEncoding:NSUTF8StringEncoding];
    
    [mutableRequest setHTTPMethod:@"POST"];
    [mutableRequest setHTTPBody:postData];
    
    //3.創(chuàng)建session對象
    NSURLSession *session = [NSURLSession sharedSession];
    
    //4.創(chuàng)建task
    NSURLSessionTask *task = [session dataTaskWithRequest:mutableRequest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        //5.解析
        if (error == nil) {
            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            
            NSLog(@"dic = %@",dic);
        }
        
    }];
    
    //6.啟動(dòng)任務(wù)
    [task resume];