NSURLConnection的使用，nsurlconnection

NSURLConnection的使用，nsurlconnection

一：NSURLConnection（IOS9.0已經棄用）是早期apple提供的http訪問方式。以下列出了常用的幾個情境：GET請求，POST請求，Response中帶有json資料

      對於NSURLConnection有以下注意事項：（1）sendAsynchronourequest: queue: completionHandler:函數中的queue參數表示的是“handler 這個block運行在queue中，如果queue為mainThread，那麼hanlder就運行在主線程；所以在處理UI的時候需要注意這個參數”

（1）Get請求（返迴文本）

  //Request    NSMutableURLRequest *urlRequest = [NSMutableURLRequest new];     [urlRequest setURL:[NSURL URLWithString:@"http://XXX.sinaapp.com/test/test.php?namr&id=43"]];    [urlRequest setTimeoutInterval:10.0f];    [urlRequest setHTTPMethod:@"GET"];    [urlRequest setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];    NSOperationQueue *queue = [[NSOperationQueue alloc]init];    [NSURLConnection sendAsynchronousRequest:urlRequest                                       queue:queue                           completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {    
　　　　//根據回複Headers，確認是是否為NSHTTPURLResponse的對象  　　  if([response isKindOfClass:[NSHTTPURLResponse class]]){    　　      NSHTTPURLResponse *resHttp = (NSHTTPURLResponse *)response;      　　    NSLog(@"status = %ld",resHttp.statusCode);//200 304 401......        　　  NSDictionary *dicHeader = resHttp.allHeaderFields;          　　NSLog(@"headers = %@",dicHeader);　　    }   　　 else{     　　     NSLog(@"not http");    　　}
　　    if(data){   　　       NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];      　　    NSLog(@"%@",html);　　    }     }];

 

 （2）POST請求（返迴文本）

    //Request    NSMutableURLRequest *urlRequest = [NSMutableURLRequest new];    [urlRequest setURL:[NSURL URLWithString:@"http://XXX.sinaapp.com/test/test.php"]];    [urlRequest setTimeoutInterval:10.0f];    [urlRequest setHTTPMethod:@"POST"];    [urlRequest setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];    NSString *strBody = @"p1=abc&p2=12";    [urlRequest setHTTPBody:[strBody dataUsingEncoding:NSUTF8StringEncoding]];    NSOperationQueue *queue = [[NSOperationQueue alloc]init];
    [NSURLConnection     sendAsynchronousRequest:urlRequest     queue:queue     completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {         //確認是http         if([response isKindOfClass:[NSHTTPURLResponse class]]){             NSHTTPURLResponse *resHttp = (NSHTTPURLResponse *)response;                        NSLog(@"status = %ld",resHttp.statusCode);//200 304 401......             NSDictionary *dicHeader = resHttp.allHeaderFields;             NSLog(@"headers = %@",dicHeader);         }         else{             NSLog(@"not http");         }         if(data){             NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];             NSLog(@"%@",html);         }    }];

 

    

（3）Response中有Json資料

    //Request    NSMutableURLRequest *urlRequest = [NSMutableURLRequest new];    [urlRequest setURL:[NSURL URLWithString:@"http://XXX.sinaapp.com/test/test.php"]];    [urlRequest setTimeoutInterval:10.0f];    [urlRequest setHTTPMethod:@"POST"];    [urlRequest setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];    NSString *strBody = @"p1=abc&p2=12";    [urlRequest setHTTPBody:[strBody dataUsingEncoding:NSUTF8StringEncoding]];    NSOperationQueue *queue = [[NSOperationQueue alloc]init];    [NSURLConnection     sendAsynchronousRequest:urlRequest     queue:queue     completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {         NSError *err2 = nil;         id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&err2];         if([jsonObject isKindOfClass:[NSDictionary class]]){             NSLog(@"NSDictionary");             NSDictionary *dic = jsonObject;             NSLog(@"dic = %@",dic);         }         else if([jsonObject isKindOfClass:[NSArray class]]){             NSLog(@"NSDictionary");             NSDictionary *arr = jsonObject;             NSLog(@"arr = %@",arr);         }     }];

　

（4）Request中帶有Json格式資料

    //Request    NSMutableURLRequest *urlRequest = [NSMutableURLRequest new];    [urlRequest setURL:[NSURL URLWithString:@"http://XXXX.sinaapp.com/test/test.php"]];    [urlRequest setTimeoutInterval:10.0f];    [urlRequest setHTTPMethod:@"POST"];    [urlRequest setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];    [urlRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];//這句沒有也沒關係        NSDictionary *dicRequest = @{@"name":@"leo",                                 @"id":@"456"};    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dicRequest options:NSJSONWritingPrettyPrinted error:nil];    [urlRequest setHTTPBody:jsonData];        NSOperationQueue *queue = [[NSOperationQueue alloc]init];        [NSURLConnection     sendAsynchronousRequest:urlRequest     queue:queue     completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {         NSError *err2 = nil;         id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&err2];                  if([jsonObject isKindOfClass:[NSDictionary class]]){             NSLog(@"NSDictionary");             NSDictionary *dic = jsonObject;             NSLog(@"dic = %@",dic);         }         else if([jsonObject isKindOfClass:[NSArray class]]){             NSLog(@"NSDictionary");             NSDictionary *arr = jsonObject;             NSLog(@"arr = %@",arr);         }     }];

　　

 伺服器端的處理與返回（將request的值末尾加上_appending，然後返回）

<?phpheader('Access-Control-Allow-Origin:*');$json_string = $GLOBALS['HTTP_RAW_POST_DATA'];$obj = json_decode($json_string);//echo $obj->name;//echo $obj->id;$arr = array(        "name"=>$obj->name."_appending",        "id"=>$obj->id."_appending");echo json_encode($arr);

　　

(5)從伺服器下載圖片（啟示就是普通的GET請求，只是將response中的data轉為Image而已）

 //Request    NSMutableURLRequest *urlRequest = [NSMutableURLRequest new];    [urlRequest setURL:[NSURL URLWithString:@"https://res.wx.qq.com/mpres/htmledition/images/pic/case-detail/nfhk_l23b6fe.jpg"]];    [urlRequest setTimeoutInterval:10.0f];    [urlRequest setHTTPMethod:@"GET"];    [urlRequest setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];        [NSURLConnection     sendAsynchronousRequest:urlRequest     queue:[NSOperationQueue mainQueue]     completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {         UIImage *img = [UIImage imageWithData:data];         [self.imgView setImage:img];     }];    

 

（6）以上所有動作都可以使用代理來做，遠離上都是一樣的

      NSURLConnectionDataDelegate,

      NSURLConnectionDelegate,

      NSURLConnectionDownloadDelegate