Without seeing the render function is a bit tough. Although can already spot something you should do, every time you use an interval you got to clear it on unmount. So: componentDidMount() { this.loadInterval = setInterval(this.loadSearches, this.props.pollInterval); } componentWillUnmount () { this.loadInterval && clearInterval(this.loadInterval); this.loadInterval = false; } Since those success and error callbacks might … Read more
You should invoke your second function as a callback to setState, as setState happens asynchronously. Something like: this.setState({pencil:!this.state.pencil}, myFunction) However in your case since you want that function called with a parameter you’re going to have to get a bit more creative, and perhaps create your own function that calls the function in the props: … Read more
You know a winning move can only happen after X or O has made their most recent move, so you can only search row/column with optional diag that are contained in that move to limit your search space when trying to determine a winning board. Also since there are a fixed number of moves in … Read more
1.On Child Widget : add parameter Function paramter class ChildWidget extends StatefulWidget { final Function() notifyParent; ChildWidget({Key key, @required this.notifyParent}) : super(key: key); } 2.On Parent Widget : create a Function for the child to callback refresh() { setState(() {}); } 3.On Parent Widget : pass parentFunction to Child Widget new ChildWidget( notifyParent: refresh ); … Read more
Fragments do not have an onRestoreInstanceState method. You can achieve the same result in onActivityCreated, which receives a bundle with the saved instance state (or null). Check the source code here.
Update Starting from recyclerview:1.2.0-alpha02 release StateRestorationPolicy has been introduced. It could be a better approach to the given problem. This topic has been covered on android developers medium article. Also, @rubén-viguera shared more details in the answer below. https://stackoverflow.com/a/61609823/892500 Old answer If you are using LinearLayoutManager, it comes with pre-built save api linearLayoutManagerInstance.onSaveInstanceState() and restore … Read more
I see 4 issues with your code: In your timer method you are always setting your current count to 10 You try to update the state in render method You do not use setState method to actually change the state You are not storing your intervalId in the state Let’s try to fix that: componentDidMount: … Read more
We can use params, new feature of the UI-Router: API Reference / ui.router.state / $stateProvider params A map which optionally configures parameters declared in the url, or defines additional non-url parameters. For each parameter being configured, add a configuration object keyed to the name of the parameter. See the part: “…or defines additional non-url parameters…” … Read more
The solution indicated by @(Ted Hopp) works, but needs a little correction: in the selector, the item states need an “app:” prefix, otherwise the inflater won’t recognise the namespace correctly, and will fail silently; at least this is what happens to me. Allow me to report here the whole solution, with some more details: First, … Read more
Read Functional Programming in a Nutshell. There are lots of advantages to stateless programming, not least of which is dramatically multithreaded and concurrent code. To put it bluntly, mutable state is enemy of multithreaded code. If values are immutable by default, programmers don’t need to worry about one thread mutating the value of shared state … Read more