Post同步異步

//以下使用post

網址與數據分隔開

#define kNewsListURL @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx"
#define kNewsListParam @"date=20131129&startRecord=1&len=30&udid=1234567890&terminalType=Iphone&cid=213"

//代理方法所需要的協議

@interfacePostViewController ()<NSURLConnectionDelegate,NSURLConnectionDataDelegate>

//聲明一個鏈接屬性  方便在dealloc中使用

@property (nonatomic ,retain)NSURLConnection *connection;

//聲明一個可變data 用於存放數據

@property (nonatomic ,retain)NSMutableData *receiveData;

- (void)dealloc
{
    [_connectioncancel];
    [_connectionrelease];
    [_receiveDatarelease];
    [superdealloc];
}

-----------------------------------------------------------------------

//Post同步

// 1.創建網址對象(沒中文就不必轉編碼)
    NSURL *url = [NSURL URLWithString:kNewsListURL];
   
    // 2.利用網址對象 創建請求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:(NSURLRequestUseProtocolCachePolicy) timeoutInterval:10];
   
    //設置標識
    [request setHTTPMethod:@"Post"];
   
    //把字符串轉化成data使用UTF-8的編碼格式(攜帶的請求體)
    NSData *data = [kNewsListParam dataUsingEncoding:NSUTF8StringEncoding];
   
    //注意區別: post請求可以攜帶一個請求體
    [request setHTTPBody:data];
   
    //創建同步鏈接
    NSData *newData = [NSURLConnection sendSynchronousRequest:request
returningResponse:nil error:nil];
   
    //解析數據
    NSMutableDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:newData options:(NSJSONReadingMutableContainers) error:nil];

    NSLog(@"%@",dataDic);

-----------------------------------------------------------------------

Post異步請求

 //獲取網址對象
    NSURL *url = [NSURL URLWithString:kNewsListURL];
    //利用網址對象創建一個請求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:(NSURLRequestUseProtocolCachePolicy) timeoutInterval:10];
    //創建標識
    //注意:post請求需要添加標識符
    [request setHTTPMethod:@"post"];
   
    //給這個請求添加請求體
    NSData *data = [kNewsListParam dataUsingEncoding:NSUTF8StringEncoding];
    [request setHTTPBody:data];
    //利用請求創建一個鏈接 (異步代理方法)

-----------------------------------------------------------------------

#pragma mark -- block方法
    [NSURLConnection sendAsynchronousRequest:requestqueue:[NSOperationQueue mainQueue]completionHandler:^(NSURLResponse * _Nullable response,NSData *_Nullable data,NSError *_Nullable connectionError) {
       

    }];   

-----------------------------------------------------------------------

   self.connection = [NSURLConnection connectionWithRequest:requestdelegate:self];

    [self.connectionstart];

-----------------------------------------------------------------------

#pragma mark --代理方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    //鏈接成功時創建data
    self.receiveData = [NSMutableData data];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    //拼接data
    [self.receiveData appendData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    //解析數據
    NSMutableDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:self.receiveData options:(NSJSONReadingMutableContainers) error:nil];
    NSLog(@"%@",dataDic);

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
   

}

UI第十六天 16-NSURLRequest