WKWebView 加载本地 CSS 样式

// 从 Bundle 中加载 css
- (void)loadFromBundle {
    NSMutableString *html = [NSMutableString string];
    [html appendString:@""];
    [html appendFormat:@""];
    [html appendString:@"
测试文案
"];
    
    NSURL *myUrl = [NSURL fileURLWithPath:[NSBundle mainBundle].bundlePath];
    [_webView loadHTMLString:html baseURL:myUrl];
}

// 从本地文件中加载 css
- (void)loadFromLocal {
    NSMutableString *html = [NSMutableString string];
    [html appendString:@""];
    [html appendFormat:@""];
    [html appendString:@"
测试文案
"];
    
    NSString *cssPath = [NSString stringWithFormat:@"%@",NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)];
    NSURL *myUrl = [NSURL fileURLWithPath:cssPath];
    [_webView loadHTMLString:html baseURL:myUrl];
}