iOS uiwebview goBack 历史控制
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iOS uiwebview goBack history control
提问by Jaume
I am loading a "webpage1" on an uiwebview and saving its first request on an instance variable "webviewHistory". Then, I must reuse that webview to load another page, "webpage2" (saved its first request to "webviewHistory" too), and history should start now from this request. Problem is if I execute goBack (button IBAction) from "webpage2", I can keep going back to "webpage1" history and following. If I check request and compare with initial saved, works! but not with redirections, for example, if I trigger request to www.youtube.com, request is redirectioned to m.youtube.com and first one is not saved as navigation history! how to solve it?
我正在 uiwebview 上加载“webpage1”并将其第一个请求保存在实例变量“webviewHistory”上。然后，我必须重用该 webview 来加载另一个页面“webpage2”（也将其第一个请求保存到“webviewHistory”），并且历史现在应该从这个请求开始。问题是，如果我从“webpage2”执行 goBack（按钮 IBAction），我可以继续返回到“webpage1”历史记录和关注。如果我检查请求并与初始保存的进行比较，则有效！但不是重定向，例如，如果我触发对 www.youtube.com 的请求，请求将重定向到 m.youtube.com 并且第一个不会保存为导航历史记录！如何解决？
if (![webViewSocial.request.URL.absoluteString isEqualToString:self.webviewHistory]){
[webViewSocial goBack];
}
回答by Msencenb
UIWebviews have instance methods that allow you to go backwards and forwards with the history, without you having to track the last request. Is there a particular reason you are saving the last request specifically?
UIWebviews 具有实例方法，允许您根据历史记录前后移动，而无需跟踪最后一个请求。您是否有特殊原因专门保存最后一个请求？
Sample code:
示例代码：
if ([webView canGoBack]) {
[webView goBack];
}
Here is a project that is a simple uiwebview browser if you want to play with it: https://github.com/msencenb/UIWebView-Example
这是一个简单的 uiwebview 浏览器项目，如果您想使用它：https: //github.com/msencenb/UIWebView-Example
回答by CodeOverRide
for swift 3 version of Msencenb answer:
对于 swift 3 版本的 Msencenb 答案：
if webView.canGoBack {
webView.goBack()
}
