If using the new style context, re-declare this in your class to be the
React.ContextType of your static contextType.
Should be used with type annotation or static contextType.
static contextType = MyContext
// For TS pre-3.7:
context!: React.ContextType<typeof MyContext>
// For TS 3.7 and above:
declare context: React.ContextType<typeof MyContext>
Readonly propsStatic Optional contextIf set, this.context will be set at runtime to the current value of the given Context.
type MyContext = number
const Ctx = React.createContext<MyContext>(0)
class Foo extends React.Component {
static contextType = Ctx
context!: React.ContextType<typeof Ctx>
render () {
return <>My context's value: {this.context}</>;
}
}
https://react.dev/reference/react/Component#static-contexttype
Static forceIs 3D Touch / Force Touch available (i.e. will touch events include force)
ios
Optional UNSAFE_Called immediately before mounting occurs, and before Component.render. Avoid introducing any side-effects or subscriptions in this method.
This method will not stop working in React 17.
Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.
Optional UNSAFE_Called when the component may be receiving new props. React may call this even if props have not changed, so be sure to compare new and existing props if you only want to handle changes.
Calling Component.setState generally does not trigger this method.
This method will not stop working in React 17.
Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.
Optional UNSAFE_Called immediately before rendering when new props or state is received. Not called for the initial render.
Note: You cannot call Component.setState here.
This method will not stop working in React 17.
Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.
16.3, use getSnapshotBeforeUpdate instead
Optional componentOptional componentOptional componentCalled immediately after updating occurs. Not called for the initial render.
The snapshot is only present if getSnapshotBeforeUpdate is present and returns non-null.
Optional componentCalled immediately before mounting occurs, and before Component.render. Avoid introducing any side-effects or subscriptions in this method.
Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.
Optional componentCalled when the component may be receiving new props. React may call this even if props have not changed, so be sure to compare new and existing props if you only want to handle changes.
Calling Component.setState generally does not trigger this method.
Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.
Optional componentOptional componentCalled immediately before rendering when new props or state is received. Not called for the initial render.
Note: You cannot call Component.setState here.
Note: the presence of getSnapshotBeforeUpdate or getDerivedStateFromProps prevents this from being invoked.
16.3, use getSnapshotBeforeUpdate instead; will stop working in React 17
Optional getRuns before React applies the result of Component.render render to the document, and returns an object to be given to componentDidUpdate. Useful for saving things such as scroll position before Component.render render causes changes to it.
Note: the presence of this method prevents any of the deprecated lifecycle events from running.
Determines the location on screen, width, and height of the given view and returns the values via an async callback. If successful, the callback will be called with the following arguments:
Note that these measurements are not available until after the rendering
has been completed in native. If you need the measurements as soon as
possible, consider using the onLayout
prop instead.
Determines the location of the given view in the window and returns the values via an async callback. If the React root view is embedded in another native view, this will give you the absolute coordinates. If successful, the callback will be called with the following arguments:
Note that these measurements are not available until after the rendering has been completed in native.
Like measure(), but measures the view relative an ancestor,
specified as relativeToNativeComponentRef. This means that the returned x, y
are relative to the origin x, y of the ancestor view.
Can also be called with a relativeNativeNodeHandle but is deprecated.
Optional onFail: (() => void)This function sends props straight to native. They will not participate in future diff process - this means that if you do not include them in the next render, they will remain active (see Direct Manipulation).
Optional shouldCalled to determine whether the change in props and state should trigger a re-render.
Component always returns true.
PureComponent implements a shallow comparison on props and state and returns true if any
props or states have changed.
If false is returned, Component.render, componentWillUpdate
and componentDidUpdate will not be called.
Deprecated
See
React Docs