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func performTextRecognition() {
    textDetector = vision.textDetector()
    let uiImage = UIImage(named: "demo_image")
    let visionImage = VisionImage(image: uiImage!)
    let visionMetaData = VisionImageMetadata()
    visionMetaData.orientation = .bottomRight
    visionImage.metadata = visionMetaData

    textDetector!.detect(in: visionImage) { (features, error) in
        guard error == nil, let features = features, !features.isEmpty else {
            print("Error. You should also check the console for error messages.")
            // ...

            return
        }

        // Recognized and extracted text

        print("Detected text has: \(features.count) blocks")
        for block in features {
            print("\"\(block.text)\"")
        }
        // ...

    }
}

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November 11, 2019：ML Kit更新
October 16, 2019：ML Kit更新
September 26, 2019：ML Kit更新
September 09, 2019：ML Kit更新
August 28, 2019：ML Kit更新
August 16, 2019：ML Kit更新
July 26, 2019：ML Kit更新
July 24, 2019：ML Kit更新
July 12, 2019：ML Kit更新
June 17, 2019：ML Kit更新
May 28, 2019：ML Kit更新
May 7, 2019：ML Kit更新
March 27, 2019：ML Kit更新
January 31, 2019：ML Kit更新
January 30, 2019：ML Kit更新
January 18, 2019：unity更新
November 29, 2018：ML Kit更新
October 16, 2018：ML Kit更新
October 3, 2018:增加unity版本
August 13, 2018：ML Kit更新
June 20, 2018：增加ios版本
May 23, 2018：ML Kit更新
May 8, 2018：ML Kit首次发布

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ML Kit Common version 22.0.1
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Vision version 24.0.1
Fixed a bug which allowed the use of FirebaseAutoMLRemoteModel when instantiating AutoML FirebaseVisionImageLabeler without calling FirebaseModelManager.download if the model had already been downloaded and existed locally.
ML Kit Barcode Model version 16.0.2
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Object Detection and Tracking Model version 19.0.3
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Model Interpreter version 22.0.1
Fixed a bug which allowed the use of FirebaseCustomRemoteModel when instantiating FirebaseModelInterpreter without calling FirebaseModelManager.download if the model had already been downloaded and existed locally.
ML Kit Vision AutoML version 18.0.3
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.

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ML Kit Common version 22.0.0
This release contains breaking changes. Review details of the changes below.
Breaking change: Updated FirebaseRemoteModel with the following changes in order to get feature specific handling:

FirebaseRemoteModel and FirebaseLocalModel initializers are disabled. With this release, new subclasses have been added for AutoML, Custom, and Translate SDKs. Use the intializers for those subclasses to create instances of remote and local models.
initialConditions and updatesConditions are moved out of FirebaseRemoteModel; now specify the downloadConditions in the FirebaseModelManager.download API.
Breaking change: Updated FirebaseModelManager with the following changes to simplify developer workflow for using remoteModel and localModel:

Simplified the API by eliminating the requirement of advance model registration. FirebaseRemoteModel and FirebaseLocalModel registration APIs are removed.
deleteDownloadedModel(remoteModel) API is introduced to remove downloaded models not in use to save space.
Updated downloadRemoteModelIfNeeded(remoteModel) to download(remoteModel, downloadConditions). Download conditions can now be specified directly at the time when the download API is invoked.
Developers now have full control and flexibility to customize the model download options to fit their needs, including indicating whether to use a remote model or a local model.
Added isModelDownloaded(remoteModel) API.
ML Kit Vision version 24.0.0
This release contains breaking changes. Review details of the changes below.
Added FirebaseAutoMLRemoteModel and FirebaseAutoMLLocalModel as instantiable subclasses of FirebaseRemoteModel and FirebaseLocalModel classes, respectively.

Breaking change: Updated the initializers for FirebaseVisionOnDeviceAutoMLImageLabelerOptions to be initialized with either a FirebaseAutoMLRemoteModel or a FirebaseAutoMLLocalModel, but not both.

Breaking change: Implicit model downloading is no longer available through the AutoML FirebaseVisionImageLabeler. You must invoke the download(remoteModel, downloadConditions) API from ModelManager to download any FirebaseAutoMLRemoteModel.

Enhanced barcode scanner with better speed and accuracy. The enhancements are available in the firebase-ml-vision-barcode-model v16.0.1 and later.

ML Kit Vision AutoML version 18.0.2
Warning: Due to an issue in ML Kit Vision AutoML v18.0.2, when using a remote model, you must call firebaseModelManager.download(remoteModel) before initialization, regardless of what firebaseModelManager.isModelDownloaded() returns.
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Barcode Model version 16.0.1
Updated the Barcode implementation with the newly added Barcode Model, which comes with significant improvements in both latency and accuracy. Also added API to access the raw bytes for non UTF-8 encoded barcode data. To learn more, refer to the ML Kit documentation.
ML Kit Object Detection and Tracking Model version 19.0.2
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Model Interpreter version 22.0.0
Warning: Due to an issue in ML Kit Model Interpreter v22.0.0, when using a remote model, you must call firebaseModelManager.download(remoteModel) before initialization, regardless of what firebaseModelManager.isModelDownloaded() returns.
This release contains breaking changes. Review details of the changes below.
Added FirebaseCustomRemoteModel and FirebaseCustomLocalModel as instantiable subclasses of FirebaseRemoteModel and FirebaseLocalModel classes, respectively.

Breaking change: Replace FirebaseModelOptions with FirebaseModelInterpreterOptions. Note that FirebaseModelInterpreterOptions can only be initialized with either a FirebaseCustomRemoteModel or a FirebaseCustomLocalModel, but not both.

Breaking change: Implicit model downloading is no longer available through the FirebaseModelInterpreter. You must invoke the download(remoteModel, downloadConditions) API from FirebaseModelManager to download any FirebaseCustomRemoteModel.

ML Kit Natural Language version 22.0.0
This release contains breaking changes. Review details of the changes below.
Breaking change: Updated FirebaseTranslateRemoteModel with the following changes to simplify the developer workflow:

Removed the setFirebaseApp method in Builder. A custom FirebaseApp is now supported through the getInstance method in FirebaseModelManager.
Removed the setDownloadConditions method in Builder. Download conditions are now passed to the download method in FirebaseModelManager.
Breaking change: Removed FirebaseTranslateModelManager. Translate models are now handled through FirebaseModelManager.

ML Kit Language Identification Model version 20.0.7
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Smart Reply Model version 20.0.7
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Translate Model version 20.0.7
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.

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ML Kit Natural Language version 21.0.3
Internal changes to ensure functionality alignment with other SDK releases.
ML Kit Language Identification Model version 20.0.6
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Smart Reply Model version 20.0.6
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.
ML Kit Translate Model version 20.0.6
Versioned only to ensure compatibility with other ML Kit SDKs released simultaneously.

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- Unified and enhanced on-device and cloud text recognition API.
- Enhanced cloud document scanning API.

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Improved custom model downloading logic to handle user cancellation.