how to use setstate
class App extends React.Component {
state = { count: 0 }
handleIncrement = () => {
this.setState({ count: this.state.count + 1 })
}
handleDecrement = () => {
this.setState({ count: this.state.count - 1 })
}
render() {
return (
<div>
<div>
{this.state.count}
</div>
<button onClick={this.handleIncrement}>Increment by 1</button>
<button onClick={this.handleDecrement}>Decrement by 1</button>
</div>
)
}
}state react
class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
render() {
return (
<div>
<p>You clicked {this.state.count} times</p>
<button onClick={() => this.setState({ count: this.state.count + 1 })}>
Click me
</button>
</div>
);
}
}setState
@protected
void setState(VoidCallback fn) {
if (_scopeKey.currentState != null) {
_scopeKey.currentState!._routeSetState(fn);
} else {
// The route isn't currently visible, so we don't have to call its setState
// method, but we do still need to call the fn callback, otherwise the state
// in the route won't be updated!
fn();
}
}Copyright © 2021 Codeinu
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