逍遙文工作室

實在不曉得怎麼命名這篇技術文章，其實就是想要呼叫Web Service來取得資料，跟我過去平常使用的方式不太一樣，所以就特別來一篇記錄，未來就直接參考囉～

後台工程師特別使用x-www-form-urlencoded來呼叫此API，怎麼不跟之前一樣使用raw呢？下次來拷問他ＸＤ～強迫我一定要學新的實作方法！

就直接來看我怎麼成功寫這個method：

/**
 Theme: x-www-form-urlencoded
 IDE: Xcode 9
 Language: Objective C
 Date: 107/03/11
 Author: HappyMan
 Blog: https://cg2010studio.com/
 */

- (void)searchPeopleWithInfoDict:(NSDictionary *)dict offset:(NSString *)offset success:(void (^)(NSDictionary *dict))successBlock fail:(void (^)(NSError *error))failBlock
{
    NSURLSessionConfiguration* sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];

    /* Create session, and optionally set a NSURLSessionDelegate. */
    NSURLSession* session = [NSURLSession sessionWithConfiguration:sessionConfig delegate:nil delegateQueue:nil];

    NSString *subURLStr = [NSString stringWithFormat:@"api/v1/search/%@", offset];
    NSURL* URL = [NSURL URLWithString: [APIBaseDomain stringByAppendingString:subURLStr]];

    NSString *post =[NSString stringWithFormat:@"agemin=%@&agemax=%@&heightmin=%@&heightmax=%@&weightmin=%@&weightmax=%@", [dict[@"agemin"] description], [dict[@"agemax"] description], [dict[@"heightmin"] description], [dict[@"heightmax"] description], [dict[@"weightmin"] description], [dict[@"weightmax"] description]];
    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
    NSString *postLength = [NSString stringWithFormat:@"%ld",[postData length]];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:URL];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request addValue:[@"" stringByAppendingString:[STUserDefaults sharedInstance].accessToken] forHTTPHeaderField:@"user"];
    [request setHTTPBody:postData];
    NSError *error;
    NSURLResponse *response;
    NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
    NSString *str=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
    NSLog(@"str: %@", str);

    /* Start a new Task */
    [self taskWithSession:session request:request success:^(NSDictionary *dict) {
        successBlock(dict);
    } fail:^(NSError *error) {
        failBlock(error);
    }];
}

最關鍵的地方就是在Header設定Content-Type為x-www-form-urlencoded。傳遞參數要使用ASCII編碼。

後來我發現Postman有工具可以幫我產生code，如此我就不用上網搜尋範例來趕。話說Chrome版本的Postman弱掉了，改用Mac版本的Postman能順利為我產出程式碼：

#import 

NSDictionary *headers = @{ @"user": @"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhY2NvdW50IjoiamltbXlrbyIsImV4cCI6MTUxODE4ODA4NywiaWQiOjF9.6wtHIvrLVZej5fsHRkUa9UUa-viIbXrrPW12uYLRHQMX",
                           @"Cache-Control": @"no-cache",
                           @"Postman-Token": @"339f6c7e-d45a-4f45-8d2f-6586426068aex",
                           @"Content-Type": @"application/x-www-form-urlencoded" };

NSMutableData *postData = [[NSMutableData alloc] initWithData:[@"agemin=20" dataUsingEncoding:NSUTF8StringEncoding]];<span id="mce_SELREST_start" style="overflow:hidden;line-height:0;">&#65279;</span>
[postData appendData:[@"&amp;agemax=100" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&amp;heightmin=100" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&amp;heightmax=180" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&amp;weightmin=32" dataUsingEncoding:NSUTF8StringEncoding]];
[postData appendData:[@"&amp;weightmax=100" dataUsingEncoding:NSUTF8StringEncoding]];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://api.happydate.com/api/v1/search/0"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
                                                }
                                            }];
[dataTask resume];

讓懶人如我者可以省去不少嘗試時間！

參考：[iOS] WebView 解決網頁亂碼問題、POST request using application/x-www-form-urlencoded。