多线程Operation一些基础 Swift

#Swift, Operation

Operation是一个抽象类.
所以一般都是使用它的子类来实现多线程。

比如 BlockOperation的使用

let blockOperation = BlockOperation()
blockOperation.queuePriority = .veryHigh
blockOperation.addExecutionBlock {
    print("block 1",Thread.current)
}
blockOperation.addExecutionBlock {
    print("block 2",Thread.current)
}

blockOperation.start()

再来看一下 OperationQueue 的使用

let queue = OperationQueue()
queue.maxConcurrentOperationCount = 1
queue.addOperation {
    print("block 2",Thread.current)
}
//队列取消
queue.cancelAllOperations()

//队列暂停
queue.isSuspended = true

//队列恢复
queue.isSuspended = false

BlockOperation可以添加到OperationQueue配合使用，
其实只需要

let queue = OperationQueue()
queue.addOperation(blockOperation)

addOperation这个方法自动触发
blockOperation.start()
这段代码

#Swift, Operation