iOS 字典转JSONData，作为HTTPBody，发送POS

//模型转字典

NSDictionary*modelDict = [selfgetPropertyDict:_registerModel];

//字典转json数据

NSData*jsonData = [NSJSONSerializationdataWithJSONObject:modelDictoptions:0error:nil];

NSLog(@"jsonData : %@", [[NSStringalloc]initWithData:jsonDataencoding:NSUTF8StringEncoding]);

NSString*regiseterStr = [[GetUrlStringsharedManager]urlWithRegister];

NSURL*registerURL = [NSURLURLWithString:regiseterStr];

NSMutableURLRequest*request = [NSMutableURLRequestrequestWithURL:registerURL];

[requestsetHTTPMethod:@"POST"];

[requestsetHTTPBody:jsonData];

NSURLSession*session = [NSURLSessionsharedSession];

NSURLSessionDataTask*task = [sessiondataTaskWithRequest:requestcompletionHandler:^(NSData*_Nullabledata,NSURLResponse*_Nullableresponse,NSError*_Nullableerror) {

if(!error) {

NSDictionary*resultDict = [NSJSONSerializationJSONObjectWithData:dataoptions:0error:nil];

NSString*info = resultDict[@"info"];

[selfdisplayAlertControllerWithMessage:info];

}

}];

[taskresume];

其中jsonData输出：{"county":"东城区","password":"jimg","userName":"jimg","city":"北京","mobile":"23456458","memberType":"1","regCode":"234577","province":"北京"}；

info: A JSONObject text must begin with '{' at character 1 of %7B%22county%22%3A%22%E4%B8%9C%E5%9F%8E%E5%8C%BA%22%2C%22password%22%3A%22jimg%22%2C%22userName%22%3A%22jimg%22%2C%22city%22%3A%22%E5%8C%97%E4%BA%AC%22%2C%22mobile%22%3A%2223456458%22%2C%22memberType%22%3A%221%22%2C%22regCode%22%3A%22234577%22%2C%22province%22%3A%22%E5%8C%97%E4%BA%AC%22%7D=

怎么回事？？？