领域写入事务迅速冻结屏幕

Question

我正在开发一个应用程序，我必须在本地保存图像，并且为此使用领域，该应用程序一次从图库中获取 10 到 40 张图像，然后开始将图像写入领域本地数据库并冻结写入过程中的屏幕，请如何修改我的代码，以便我的应用程序不会在写入事务期间冻结，我陷入这种情况，任何帮助将不胜感激，谢谢

let imagesAdd = refObject.1
let imageobjectArray = modelObject as! [FacilitiesImagesModel]
do{
    for imageObject in imageobjectArray{
         try realmObj.write {
              imagesAdd?.facilitiesImages.append(imageObject)
             }
     }

     completionHandler(true, "")

 }catch let err{
      realmObj.cancelWrite()
      completionHandler(false, err.localizedDescription)
 }

这是我的完整方法，我删除了不属于我的问题的额外代码

struct RealmCRUD {

private let realmObj = try! Realm()

func create<T>(modelObject: T, modelObjectType: ModelType, refObject: (PropertyModel?, FacilitiesModel?), completionHandler: @escaping ((Bool, String) -> Void)){

    switch modelObjectType {



    case .FacilitiesImagesModel:
        let imagesAdd = refObject.1
        let imageobjectArray = modelObject as! [FacilitiesImagesModel]
        do{
            for imageObject in imageobjectArray{
                try realmObj.write {
                    imagesAdd?.facilitiesImages.append(imageObject)
                    }
            }

            completionHandler(true, "")

        }catch let err{
            realmObj.cancelWrite()
            completionHandler(false, err.localizedDescription)
        }
        break
    }

    default:
    break
}

我正在像这样从其他类调用此方法：

func dismissComplete() {

    var arrayOfFacilitiesImagesModelObj = [FacilitiesImagesModel]()

    for photos in self.selectedAssets{

        if let photo = photos.fullResolutionImage{
            let facilitiesImagesModelObj = FacilitiesImagesModel()
            facilitiesImagesModelObj.facilityPhoto = photo.jpegData(compressionQuality: 0.5)!
            arrayOfFacilitiesImagesModelObj.append(facilitiesImagesModelObj)
        }else{
            print("Unable to select facility photos")
        }

    }

    self.realmCrudObj.create(modelObject: arrayOfFacilitiesImagesModelObj, modelObjectType: .FacilitiesImagesModel, refObject: (nil,self.realmFacilitiesResults), completionHandler: { (success, error)  in

        self.collectionViewReference?.reloadData()

        ProgressHUD.dismiss()

        if !success{
            self.showAlert(title: "Error", description: error)
        }
        })
}

我正在将选定的属性数据传递给此类中的此变量

    var realmFacilitiesResults: FacilitiesModel?

这是我的设施模型

class FacilitiesModel: Object {

@objc dynamic var facilityName = ""

let facilitiesImages = List<FacilitiesImagesModel>()

let parentProperty = LinkingObjects(fromType: PropertyModel.self, property: "facilities")

}

Answer 1

您的部分问题是您正在执行多个领域写入。您应该为所有对象执行一个领域写入。

do {
    let realm = try Realm()
    try realm.write {
        imagesAdd?.facilitiesImages.append(objectsIn: imageobjectArray)
        completionHandler(true, "")
    } catch {
        print("realm write error: \(error)")
        completionHandler(false, "")
    }
}

如果这仍然不能为您加快速度，那么您应该在后台线程中将您的对象添加到领域。但是因为您将在一个新线程中操作，所以您必须获得线程安全的引用。

let imageObjectsRefArray = imageObjectsArray.map { ThreadSafeReference(to: $0) }
let imagesAddRef = ThreadSafeReference(to: imagesAdd)
let queue = DispatchQueue(label: "realm.image.add")
queue.async {
    do {
        let realm = try Realm()
        guard let imagesAdd = realm.resolve(imagesAddRef) else {
            completionHandler(false, "")
            return
        }
        let imageObjectsArray = imageObjectsRefArray.compactMap { realm.resolve($0) }
        try realm.write {
            imagesAdd.facilitiesImages.append(objectsIn: imageObjectsArray)
        }
        completionHandler(true, "")
    } catch {
        print("realm write error: \(error)")
        completionHandler(false, "")
    }
}