webview 에서 html 한글이 깨질때

NSString *helpPath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" ];

NSURL *helpURL = [NSURL fileURLWithPath:helpPath];

NSData *data = [NSData dataWithContentsOfURL:helpURL];

// 인코딩만 넣어주면 됩니다. 

[self.webView loadData:data MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:helpURL];