CKOperationGroup指定订单和连锁经营

Question

由于苹果网站上缺少文档，我问这个问题。是否有任何方法可以链接到CKOperationGroup中的CKOperation以依次执行？特别是，我对两个CKModifyRecordsOperation感兴趣，我需要一个接一个地执行。

非常感谢

Answer 1

而不是使用CKOperation.completionBlock，而不是使用OperationQueue？这是我想出的。它是完全未经测试的，所以让我知道它是否无用。

class CKOperationQueue: NSObject {

    private var completionHandler: (() -> Void)?
    private var isExecuting = false
    private let operations: [CKOperation]
    private let queue: OperationQueue

    init(operations: [CKOperation]) {
        self.operations = operations
        queue = OperationQueue()
        queue.name = "CKOperationQueue"
        queue.maxConcurrentOperationCount = 1
    }

    @discardableResult func execute() -> CKOperationQueue {
        guard !isExecuting else { return self }
        isExecuting = true

        queue.addOperations(operations, waitUntilFinished: false)
        queue.addOperation {
            self.completionHandler?()
        }

        return self
    }

    @discardableResult func onCompletion(_ handler: @escaping () -> Void) -> CKOperationQueue {
        self.completionHandler = handler
        return self
    }

}