1//最基本的使用Operation2privatefunc basicOperation() {3//第一步:创建Operation4let op =Operation.init()5//第二步:把要执行的代码放入operation中6op.completionBlock ={78print(#function,#line,Thread.current)9}10//第三步:创建OperationQueue11let opQueue =OperationQueue.init()12//第四步:把Opera...
当不确定当前线程是否在主线程时,可以使用下面代码:/** Submits a block for asynchronous execution on a main queue and returns immediately. */ static inline void dispatch_async_on_main_queue(void (^block)()) { if (NSThread.isMainThread) { block(); } else { dispatch_async(dispatch_get_mai...
The priority of this operation in its operation queue. C# 複製 public virtual Foundation.NSOperationQueuePriority QueuePriority { [Foundation.Export("queuePriority")] get; [Foundation.Export("setQueuePriority:")] set; } Property Value NSOperationQueuePriority Attributes ExportAttribute Applies to ...
在一个Operation Queue中是可以同时执行多个Operation的,Operation Queue会动态的创建多个线程来完成相应Operation。具体的线程数是由Operation Queue来优化配置的,这一般取决与系统CPU的性能,比如CPU的核心数,和CPU的负载。但我们还是可以设置一个最大并发数的,那么 Operation Queue就不会创建超过最大并发数量的线程。 NS...
OperationQueue A queue that regulates the execution of operations. iOS 2.0+iPadOS 2.0+Mac Catalyst 13.1+macOS 10.5+tvOS 9.0+visionOS 1.0+watchOS 2.0+ classOperationQueue:NSObject Overview An operation queue invokes its queuedOperationobjects based on their priority and readiness. After you add an ...
Waiting on an Operation Object -waitUntilFinished Blocks execution of the current thread until the operation object finishes its task. Constants NSOperationQueuePriority These constants let you prioritize the order in which operations execute.
现在,让我们用 NSOperationQueues 重写演示项目。首先,在 ViewController 类中声明此变量: 之后,用下面的代码替代 didClickOnStart 方法。请查看我们是如何在 NSOperationQueue 中执行操作的: 如你所见,此处使用了 addOperationWithBlock 方法用给定的块(或者如 Swift 中所说,闭包)创建新的操作。其实非常简单,不是...
bpoplauschideleted theperformance_operation_queue_prioritybranchFebruary 2, 2019 18:46 Sign up for freeto join this conversation on GitHub. Already have an account?Sign in to comment zhongwuzwzhongwuzw left review comments jerelevinejerelevine left review comments ...
queuePriority - readable and writable completionBlock - readable and writable NSOperation 是线程安全的。 自定义 NSOperation 的子类,新加的或重写的方法,要自己保证是线程安全的。 When you subclassNSOperation, you must make sure that any overridden methods remain safe to call from multiple threads. If...
Gets or sets the priority of the operation in the Dispatcher queue. C# Copy public System.Windows.Threading.DispatcherPriority Priority { get; set; } Property Value DispatcherPriority The priority of the delegate on the queue. Applies to ProductVersions .NET Framework 3.0, 3.5, 4.0, 4.5, ...