iphone - 收到无法识别的选择器错误

Question

这是我正在尝试做的事情:

我正在尝试将字符串从 UITableView 选择传递到 Web 服务并返回数据集。当我对参数进行硬编码时，代码工作正常。使用下面的代码时，出现此错误:

-[NSCFString stringByReplacingOccurencesOfString:withString:]: unrecognized selector sent to instance 0x6054

-(void) getStateData 
{
    stateWebService = [[NSMutableData data] retain];
    NSMutableURLRequest *request = [[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.**********.com/webservices.asmx/getCGbyState?"]] retain];
    //[request appendString:_Campground.country];
    NSString *country = [_Campground.country stringByReplacingOccurencesOfString:@" " withString:@""];
    [request setHTTPMethod:@"POST"];
    NSString *postString = (@"country=%@",country);
    [request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
    NSURLConnection *myConnection = [NSURLConnection connectionWithRequest:request delegate:self];
    [myConnection start];
}

Answer 1

stringByReplacingOccurencesOfString 中缺少“r”。它应该是 stringByReplacingOccurrencesOfString。