UIWebView stringByEvaluatingJavaScriptFromString遇到了麻烦

Question

我在视图控制器中有以下代码."pageDisplay"是一个UIWebView.当我在模拟器中运行应用程序时,HTML页面出现在JS运行之前.ID为"myHeader"的元素(<h1>标记)保持不变.

-(void) loadPageToView:(int)pageNumber{
    NSString *path = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%d",pageNumber]ofType:@"html"];
    NSURL *url = [NSURL fileURLWithPath:path];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [pageDisplay loadRequest:request];
    [self doJavaScript];
}

-(void) doJavaScript{
    [pageDisplay    stringByEvaluatingJavaScriptFromString:@"document.getElementById('myHeader').innerHTML = \"FOO\";"];   
}                                                     

Answer 1

你打电话doJavaScript太早了.您需要等到页面加载完毕.调查Web视图委托方法- (void)webViewDidFinishLoad:(UIWebView *)webView.