import Foundation
//1.创建其他队列
let queue = NSOperationQueue()
//2.创建NSBlockOperation对象
let operation = NSBlockOperation { () -> Void in
NSLog("%@", NSThread.currentThread())
}
//3.添加多个Block
for i in 0..<5 {
operation.addExecutionBlock { () -> Void in
NSLog("第%ld次 - %@", i, NSThread.currentThread())
}
}
//4.队列添加任务
queue.addOperation(operation)
为什么这段代码运行后什么结果都没有输出,原教程里面明明有输出结果的啊!是不是xCode里面需要设置一些地方才可以实现异步多线程?