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初步swift语言学习笔记8(保留了很多OC实现)

时间:2015-09-02 08:13:45      阅读:163      评论:0      收藏:0      [点我收藏+]

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笔者:fengsh998
原文地址:http://blog.csdn.net/fengsh998/article/details/32715833
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虽然swift作为一门新语言,但还保留了很多OC的机制,使得swift和OC更好的融合在一起。假设没有OC基础的先GOOGLE一下。

如:KVO。DELEGATE。NOTIFICATION。

详见DEMO。

import Foundation

@objc   // 须要打开objc标识,否则@optional编译出错

protocol kvoDemoDelegate {
func willDoSomething()
@optional  func didDoSomething()  //可选实现,
}

let ntfname = "test_notification"

class kvoDemo : NSObject //不写NSObject默认就是从NSObject来的
{
    var delegate: kvoDemoDelegate!
    
    var presult : Double = 0.0
    
    var result : Double {
        get{
            return presult;
        }
    
        set{
          self.presult = newValue
        }
    }
    
    init()
    {
        
    }
    
    func doSomething()
    {
        if let yet = self.delegate?
        {
            delegate!.willDoSomething()
        }
        
        for _ in 1..5
        {
            println("i‘m doing now,don‘t touch me,please.")
        }
        
        if let yet = self.delegate?
        {
            delegate!.didDoSomething!()
        }
    }
    
    func notificationPost()
    {
        let ntf = NSNotificationCenter.defaultCenter()
        ntf.postNotificationName(ntfname, object :nil, userInfo:nil)
    }
    
    deinit
    {
        
    }
}
測试:

class ViewController: UIViewController,kvoDemoDelegate {
    
    //KVO
    override func observeValueForKeyPath(keyPath: String?, ofObject: AnyObject?, change: NSDictionary?, context: CMutableVoidPointer)
    {
        if keyPath == "result"
        {
            var newvalue : AnyObject?

= change?

.objectForKey("new"); println("the new value is \(newvalue)") } } //delegate func willDoSomething() { println("i will do it.") } func didDoSomething() { println("i had do it.") } //notification func onRecviceNotification(notification:NSNotification) { println("Recevice notification \(notification)") } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. var kvo = kvoDemo() kvo.addObserver(self, forKeyPath: "result", options: NSKeyValueObservingOptions.New | NSKeyValueObservingOptions.Old, context: nil) kvo.result = 280.0 kvo.removeObserver(self,forKeyPath:"result",context: nil) kvo.delegate = self kvo.doSomething() let ntf = NSNotificationCenter.defaultCenter() ntf.addObserver(self, selector:"onRecviceNotification:", name :ntfname, object : nil) kvo.notificationPost() ntf.removeObserver(self) } }


结果:

the new value is 280
i will do it.
i‘m doing now,don‘t touch me,please.
i‘m doing now,don‘t touch me,please.
i‘m doing now,don‘t touch me,please.
i‘m doing now,don‘t touch me,please.
i had do it.
Recevice notification NSConcreteNotification 0x10be60930 {name = test_notification}



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初步swift语言学习笔记8(保留了很多OC实现)

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原文地址:http://www.cnblogs.com/yxwkf/p/4777566.html

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