Observe optional

Asked Feb 16 '18 at 23:53

Active Feb 16 '18 at 23:59

Viewed 347 times

I am very new in RxSwift so question maybe a little strange: I need to observe change in UIWebView.request. At first it is nil so need to catch when it get any assign. I tried:


myWebView.rx.observe(URLRequest.self, #keyPath(UIWebView.request)
.subscribe {
print ($0)
}

Nothing. Got at first next(nil). and never call it again.

I tried:


myWebView.rx.observe(URLRequest.self, #keyPath(RUIWebView.request), options: [.new, .initial], retainSelf: true)

Also nothing.

thanks.

edited Feb 16 '18 at 23:59

asked Feb 16 '18 at 23:53

Eugene Don

Is `request` KVO observable? If not then key path observing will likely not work and give you the described behaviour. – Cristik Feb 17 '18 at 06:39
UIWebView is deprecated since iOS 8. Use WKWebView. – Tamás Sengel Feb 17 '18 at 13:26
so if it is not KVO, there is no ability to observe ? – Eugene Don Feb 17 '18 at 14:00
@the4kman WKWebView dont have same ability as UIWebView, for example load external fonts. – Eugene Don Feb 17 '18 at 14:01
@EugeneDon nope, keys that are not KVO compliant are not guaranteed to work. They might, or might not (as it happens with a lot of UIKit properties) – Cristik Feb 17 '18 at 14:06
@EugeneDon [WKWebView can load external fonts.](https://stackoverflow.com/questions/25785179/using-custom-fonts-in-wkwebview) – Tamás Sengel Feb 17 '18 at 14:06
Here'a question that might help you: https://stackoverflow.com/q/40371573/1974224 – Cristik Feb 17 '18 at 19:04
1

https://github.com/RxSwiftCommunity/RxWebKit – Valérian Feb 19 '18 at 08:36

Observe optional

0 Answers0