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I am curious about third part browser on iOS（Chrome or FireFox）
Does all of them use the WkWebview or UIWebVIew to show then web page, but do many extra work like cache etc?
So, if I want to write a browser on iOS, I must use WkWebview to show the web page and wrapping it to do more stuff？
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For those unfamiliar, iOS relies on the WebKit engine, which not only powers Safari but all web content on Apple's operating system. That's because, unlike macOS, iOS apps are required to use WebKit as their browser engine.
As of version 48, Chrome for iOS uses WKWebView, which is the same view used in Safari.
WKWebView - This view allows developers to embed web content in your app. You can think of WKWebView as a stripped-down version of Safari. It is responsible to load a URL request and display the web content. WKWebView has the benefit of the Nitro JavaScript engine and offers more features.
Unlike UIWebView, which does not support server authentication challenges, WKWebView does. In practical terms, this means that when using WKWebView, you can enter site credentials for password-protected websites.
Yes, Apple forbids other web engines explicitly (or only allows the WebKit respectively) in § 2.5.6 of App Store Review Guidelines:
2.5.6 Apps that browse the web must use the appropriate WebKit framework and WebKit Javascript.
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