Question

我的应用会显示加载后第一个屏幕上显示的问题列表。

我目前正在尝试实施它，以便它可以监听AppState并使其变为“活跃”状态。再次，它将再次刷新问题列表，以确保列表是最新的。

我目前正在使用MobX来跟踪我的状态。

一切似乎都运行良好，但流程产生以下错误......

Library type error:
/private/tmp/flow/flowlib_1950abc4/core.js:666
666:       onFulfill?: (value: R) => Promise<U> | U,
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function type. Callable signature not found in
 17:             .then(this.refreshQuestions()) // eslint-disable-line promise/prefer-await-to-then
                       ^^^^^^^^^^^^^^^^^^^^^^^ Promise. See: packages/mobile/src/questionList/QuestionRepository.js:17

packages/mobile/src/questionList/QuestionRepository.js:16
             v----------------------------
 16:         this.loadQuestionsFromCache()
 17:             .then(this.refreshQuestions()) // eslint-disable-line promise/prefer-await-to-then
                 -----------------------------^ call of method `then`
666:       onFulfill?: (value: R) => Promise<U> | U,
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function type. Callable signature not found in. See lib: /private/tmp/flow/flowlib_1950abc4/core.js:666
 17:             .then(this.refreshQuestions()) // eslint-disable-line promise/prefer-await-to-then
                       ^^^^^^^^^^^^^^^^^^^^^^^ Promise

这是我的构造函数和被调用的相关方法......

    constructor() {
        this.loadQuestionsFromCache()
            .then(this.refreshQuestions()) // eslint-disable-line promise/prefer-await-to-then
            .then(this.startListeningForStateChanges()) // eslint-disable-line promise/prefer-await-to-then
            .catch(() => {
                Alert.alert(
                    'Ooops!',
                    'Something went wrong when I tried to load everyones questions :( please try refreshing me',
                    [{text: 'OK'}],
                    {cancelable: false}
                )
            })
    }

    @action('List is refreshing (true/false) updated')
    updateIsListRefreshing(isRefreshing: boolean) {
        this.isListRefreshing = isRefreshing
    }

    @action('Set question list')
    setQuestions(questions: Question) {
        this.questions = questions
    }

    handleAppStateChange = (nextAppState: string) => {
        if (nextAppState === 'active') {
            this.refreshQuestions()
        }
    }

    startListeningForStateChanges() {
        AppState.addEventListener('change', this.handleAppStateChange)
    }

    // eslint-disable-next-line complexity, max-statements
    async refreshQuestions() {
        if (this.isListRefreshing) {
            return
        }

        try {
            this.updateIsListRefreshing(true)

            const response = await fetch(serverURL)

            if (response.status === 200) {
                const questionsText = await response.text()

                this.setQuestions(JSON.parse(questionsText).map(Question.of))
                await AsyncStorage.setItem('questions', questionsText)
            }

            this.updateIsListRefreshing(false)
        } catch (error) {
            this.updateIsListRefreshing(false)
        }
    }

    async loadQuestionsFromCache() {
        const questionsText = await AsyncStorage.getItem('questions')

        if (questionsText) {
            this.setQuestions(JSON.parse(questionsText).map(Question.of))
        }
    }

Answer 1

        @IBAction func filter1(_ sender: Any) {
               myImage.image = simpleBlurFilterExample(myImage: myImage.image)
        }

        func simpleBlurFilterExample(myImage: UIImage) -> UIImage {
                // convert UIImage to CIImage
                let inputCIImage = CIImage(image: myImage)!

                // Create Blur CIFilter, and set the input image
                let blurFilter = CIFilter(name: "CIGaussianBlur")!
                blurFilter.setValue(inputCIImage, forKey: kCIInputImageKey)
                blurFilter.setValue(8, forKey: kCIInputRadiusKey)

                // Get the filtered output image and return it
                let myImage = blurFilter.outputImage!
                return UIImage(ciImage: myImage)
}

在promise中找不到可调用签名（Flow，React Native，JS）

1 个答案: