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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