從事南昌APP開(kāi)發(fā)的技術(shù)人員都知道，在關(guān)閉和打開(kāi)鍵盤(pán)時(shí)，iOS系統分別會(huì )發(fā)出如下廣播通知：UIKeyboardDidHideNotification和UIKeyboardDid- ShowNotification。使用廣播通知的時(shí)候，百恒網(wǎng)絡(luò )認為大家需要注意的是要在合適的時(shí)機注冊和解除通知，而ViewController中的有關(guān)代碼如下：

override func viewWillAppear(animated: Bool) {

super.viewWillAppear(animated)

//注冊鍵盤(pán)出現通知

NSNotificationCenter.defaultCenter().addObserver(self, selector:

"keyboardDidShow:", name: UIKeyboardDidShowNotification,object: nil)

//注冊鍵盤(pán)隱藏通知

NSNotificationCenter.defaultCenter().addObserver(self, selector:

"keyboardDidHide:", name: UIKeyboardDidHideNotification,object: nil)

}

override func viewWillDisappear(animated: Bool) {

super.viewWillDisappear(animated)

//解除鍵盤(pán)出現通知

NSNotificationCenter.defaultCenter().removeObserver(self, name:UIKeyboardDidShowNotification, object: nil)

//解除鍵盤(pán)隱藏通知

NSNotificationCenter.defaultCenter().removeObserver(self, name:UIKeyboardDidHideNotification, object: nil)

}

func keyboardDidShow(notification: NSNotification) {

NSLog("鍵盤(pán)打開(kāi)")

}

func keyboardDidHide(notification: NSNotification) {

NSLog("鍵盤(pán)關(guān)閉")

}

-(void) viewWillAppear:(BOOL)animated {

//注冊鍵盤(pán)出現通知

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector (keyboardDidShow:)

name: UIKeyboardDidShowNotification object:nil];

//注冊鍵盤(pán)隱藏通知

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector (keyboardDidHide:)

name: UIKeyboardDidHideNotification object:nil];

[super viewWillAppear:animated];

}

-(void) viewWillDisappear:(BOOL)animated {

//解除鍵盤(pán)出現通知

[[NSNotificationCenter defaultCenter] removeObserver:self

name: UIKeyboardDidShowNotification object:nil];

//解除鍵盤(pán)隱藏通知

[[NSNotificationCenter defaultCenter] removeObserver:self

name: UIKeyboardDidHideNotification object:nil];

[super viewWillDisappear:animated];

}

-(void) keyboardDidShow: (NSNotification *)notif {

NSLog(@"鍵盤(pán)打開(kāi)");

}

-(void) keyboardDidHide: (NSNotification *)notif {

NSLog(@"鍵盤(pán)關(guān)閉");

}

南昌APP制作開(kāi)發(fā)公司-百恒網(wǎng)絡(luò )在此還要跟大家說(shuō)明的是，注冊通知在viewWillAppear:方法中進(jìn)行，解除通知在viewWillDisappear:方法中進(jìn)行。keyboardDidShow:消息是在鍵盤(pán)打開(kāi)時(shí)發(fā)出的，keyboardDidHide:消息是在鍵盤(pán)關(guān)閉時(shí)發(fā)出的。

看完以上介紹后，大家是否對關(guān)于IOS中關(guān)閉和打開(kāi)鍵盤(pán)的通知使用方法有所了解了呢? 如果還有哪些不太明白的地方，可隨時(shí)來(lái)電和我們聯(lián)系，我們專(zhuān)業(yè)為您講解。此外，本公司專(zhuān)注于A(yíng)PP開(kāi)發(fā)、南昌做網(wǎng)站、微信開(kāi)發(fā)等方面的服務(wù)，如有需要，百恒隨時(shí)為您效勞!