初探swift语言的学习笔记八(保留了许多ＯＣ的实现)
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初探swift语言的学习笔记八(保留了许多ＯＣ的实现)
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作者：fengsh998
原文地址：http://blog.csdn.net/fengsh998/article/details/32715833
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import?Foundation?? ?? @objc???//?需要打開objc標識，否則@optional編譯出錯?? ?? protocol?kvoDemoDelegate?{?? func?willDoSomething()?? @optional??func?didDoSomething()??//可選實現,?? }?? ?? let?ntfname?=?"test_notification"?? ?? class?kvoDemo?:?NSObject?//不寫NSObject默認就是從NSObject來的?? {?? ????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?? ????{?? ?????????? ????}?? }??
測試：
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)?? ????}?? }??
結果： 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}??
盡管swift作為一門新語言，但還保留了許多ＯＣ的機制，使得swift和OC更好的融合在一起。如果沒有ＯＣ基礎的先ＧＯＯＧＬＥ一下。
如：ＫＶＯ，ＤＥＬＥＧＡＴＥ，ＮＯＴＩＦＩＣＡＴＩＯＮ。
詳見ＤＥＭＯ。
[cpp]?view plaincopy
[cpp]?view plaincopy
結果：
[cpp]?view plaincopy
總結
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