为什么我的单元测试中的 UIWebView 为空？
我将应用生成的内容放入 UIWebView 中，并尝试测试我是否正确执行此操作。这是我要放入 Web 视图中的 HTML 字符串：
@"<html><head></head><body><p>Come, let me clutch thee. I have thee not, and yet I see thee still. Art thou not, fatal vision, sensible to feeling as to sight?</p></body></html>"
它会这样进入 Web 视图：
[self.webView loadHTMLString: [self HTMLStringForSnippet: model.body] baseURL: nil];
其中 model.body 仅包含
元素，并且 -HTMLStringForSnippet: 将其包装为格式良好的 HTML。在我的测试中，我依靠这个问题的答案来检索 HTML通过 JavaScript 获取正文内容：
- (void)testCorrectHTMLLoadedInWebView {
UIWebView *bodyView = controller.webView;
NSString *bodyHTML = [bodyView stringByEvaluatingJavaScriptFromString: @"document.body.innerHTML"];
STAssertEqualObjects(bodyHTML, model.body, @"Model body should be used for the web view content");
}
虽然我可以通过单步执行代码看到 UIWebView 已正确创建，并在 -loadHTMLString:baseURL: 中传递了正确的 HTML，但测试bodyHTML 为空。那么我该怎么做才能看到我期望的和之前传递到 Web 视图的实际内容呢？
I'm putting app-generated content into a UIWebView, and trying to test that I'm doing it correctly. Here's the HTML string I'm putting into the web view:
@"<html><head></head><body><p>Come, let me clutch thee. I have thee not, and yet I see thee still. Art thou not, fatal vision, sensible to feeling as to sight?</p></body></html>"
And it gets into the web view thus:
[self.webView loadHTMLString: [self HTMLStringForSnippet: model.body] baseURL: nil];
where model.body contains just the <p/> element, and -HTMLStringForSnippet: wraps it into well-formed HTML. In my test, I rely on the answers to this question to retrieve the HTML content of the body via JavaScript:
- (void)testCorrectHTMLLoadedInWebView {
UIWebView *bodyView = controller.webView;
NSString *bodyHTML = [bodyView stringByEvaluatingJavaScriptFromString: @"document.body.innerHTML"];
STAssertEqualObjects(bodyHTML, model.body, @"Model body should be used for the web view content");
}
While I can see by stepping through the code that the UIWebView is created correctly and is passed the correct HTML in -loadHTMLString:baseURL:, in the test bodyHTML is empty. So what do I have to do to see the actual content I expect and previously passed to the web view?
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UIWebView渲染需要很长时间，因此问题可能是您在内容完全加载之前访问内容。挂钩
UIWebViewDelegate的webViewDidFinishLoad:方法以确保内容已准备就绪。更新：
也许 WebViewJavascriptBridge 会带来一些帮助。
It takes a noticeable time for the
UIWebViewto render therefore the problem may be that you access the content before it is fully loaded.Hook on
UIWebViewDelegate'swebViewDidFinishLoad:method to make sure the content is ready.Update:
Maybe WebViewJavascriptBridge will bring some help.