網(wǎng)絡(luò)
NSURLConnection

常用類

lNSURL：請求地址
lNSURLRequest：一個NSURLRequest對象就代表一個請求，它包含的信息有
    一個NSURL對象
    請求方法、請求頭、請求體
    請求超時
    … …
lNSMutableURLRequest：NSURLRequest的子類

lNSURLConnection
    負(fù)責(zé)發(fā)送請求，建立客戶端和服務(wù)器的連接
    發(fā)送數(shù)據(jù)給服務(wù)器，并收集來自服務(wù)器的響應(yīng)數(shù)據(jù)

Snip20151017_4.png

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    //1.創(chuàng)建url
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];
    //2.創(chuàng)建請求(默認(rèn)發(fā)的是GET請求)(如果想發(fā)送的是POST請求,需要使用可變請求,并且改變可變請求中的)
    //2.1 NSURLRequest:不可變的請求:無法改變請求中的 請求頭, 請求體;
//    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    //2.2 NSMutableURLRequest:可以修改請求中的請求頭和請求體信息(一般都用這個);
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    //改變請求方法
    request.HTTPMethod = @"POST";
    //改變請求體
    NSString *username = @"520it";
//    防止出現(xiàn)中文無法識別,需要進(jìn)行轉(zhuǎn)碼
    username = [username stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSString *pwd = @"520it";
    NSString *str = [NSString stringWithFormat:@"username=%@&pwd=%@",username, pwd];
    request.HTTPBody = [str dataUsingEncoding:NSUTF8StringEncoding];
    //3.創(chuàng)建 NSURLConnection(有三種方式)
    //異步
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        //回調(diào)block(拿到響應(yīng)的一些數(shù)據(jù))
        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
        
    }];
    
    //同步
//    兩個*代表傳入一個指針,系統(tǒng)拿到后可以修改對應(yīng)地址的值
    NSURLResponse *res = nil;
    NSError *error = [[NSError alloc]init];
    [NSURLConnection sendSynchronousRequest:request returningResponse:&res error:&error];
    
    
    //使用代理
    NSURLConnection *conne = [[NSURLConnection alloc] initWithRequest:request delegate:self];//使用代理

    [NSURLConnection connectionWithRequest:request delegate:self];
    
    NSURLConnection *conne2 = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];
}


#pragma mark - NSURLConnectionDataDelegate

//接收到服務(wù)器的響應(yīng)
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    
}

//接收到服務(wù)器傳來的數(shù)據(jù)
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    
}

//出現(xiàn)問題
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    
}

//結(jié)束加載
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    
}

• Posted by 簡書.lovepeijun