初步swift语言学习笔记8(保留了很多OC实现)

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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