当初、こんな書き方をしていました：
render() {
if (!this.state.isReady) {
return (
<AppLoading
startAsync={this._dummyPromise}
onFinish={ () => this.setState( { isReady: true }) }
onError={console.warn}
/>
)
}
＜中略＞
async _dummyPromise() {
let delay = new Promise( (resolve, reject) => {
let wait = setTimeout( () => {
clearTimeout(wait);
resolve("Delay executed");
}, 3000);
});
return delay;
}
参考ソース：https://italonascimento.github.io/applying-a-timeout-to-your-promises/
こちらのほうが簡潔に書けます：
render() {
if (!this.state.isReady) {
return (
<AppLoading
startAsync={this._dummyPromise}
onFinish={ () => this.setState( { isReady: true }) }
onError={console.warn}
/>
)
}
＜中略＞
async _dummyPromise() {
await new Promise(resolve => setTimeout(resolve, 3000));
}
