Swift创建线程

最近在对比Objective-c学习Swift

创建线程执行一个方法就结束线程，这种可以用GCD或者queue实现，没必要浪费资源创建一个新线程。本文中说的创建线程是创建一个不会结束的线程

直接上干货，Objective-c中创建线程参考AFNetworking 2中的方法：

Jietu20170502-152309@2x.jpg

Swift中创建不结束的线程同样需要显示的启动runloop

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        createThreadOne()
        createThreadTwo()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func createThreadOne() {
        let newThread = Thread.init(target: self, selector: #selector(threadOne), object: nil)
        newThread.start()
    }
    
    func threadOne() {
        print("thread one func")
        Timer.scheduledTimer(withTimeInterval: 2, repeats: true, block: { (timer) in
            print("thread one")
        })
        RunLoop.current.add(Port(), forMode: .commonModes)
        RunLoop.current.run()
    }
    
    func createThreadTwo() {
        Thread.detachNewThreadSelector(#selector(threadTwo), toTarget: self, with: nil)
    }
    
    func threadTwo() {
        print("thread two func")
        Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: {
            (timer) in
            print("thread two")
        })
        RunLoop.current.add(Port(), forMode: .commonModes)
        RunLoop.current.run()
    }