我在StackOverflow上寻找解决方案，但没有找到。我的代码是:CGRectrect=_postContentView.bounds;_postContentUIWV=[[UIWebViewalloc]initWithFrame:rect];[_postContentUIWVloadHTMLString:selectedPostCD.contentbaseURL:nil];intfontSize=30;NSString*jsString=[[NSStringalloc]initWithFormat:@"document.getElementsByTagName('span')[0