從事南昌APP開發(fā)的技術人員都知道，在關閉和打開鍵盤時，iOS系統(tǒng)分別會發(fā)出如下廣播通知：UIKeyboardDidHideNotification和UIKeyboardDid- ShowNotification。使用廣播通知的時候，百恒網(wǎng)絡認為大家需要注意的是要在合適的時機注冊和解除通知，而ViewController中的有關代碼如下：

override func viewWillAppear(animated: Bool) {

super.viewWillAppear(animated)

//注冊鍵盤出現(xiàn)通知

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

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

//注冊鍵盤隱藏通知

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

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

}

override func viewWillDisappear(animated: Bool) {

super.viewWillDisappear(animated)

//解除鍵盤出現(xiàn)通知

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

//解除鍵盤隱藏通知

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

}

func keyboardDidShow(notification: NSNotification) {

NSLog("鍵盤打開")

}

func keyboardDidHide(notification: NSNotification) {

NSLog("鍵盤關閉")

}

-(void) viewWillAppear:(BOOL)animated {

//注冊鍵盤出現(xiàn)通知

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector (keyboardDidShow:)

name: UIKeyboardDidShowNotification object:nil];

//注冊鍵盤隱藏通知

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector (keyboardDidHide:)

name: UIKeyboardDidHideNotification object:nil];

[super viewWillAppear:animated];

}

-(void) viewWillDisappear:(BOOL)animated {

//解除鍵盤出現(xiàn)通知

[[NSNotificationCenter defaultCenter] removeObserver:self

name: UIKeyboardDidShowNotification object:nil];

//解除鍵盤隱藏通知

[[NSNotificationCenter defaultCenter] removeObserver:self

name: UIKeyboardDidHideNotification object:nil];

[super viewWillDisappear:animated];

}

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

NSLog(@"鍵盤打開");

}

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

NSLog(@"鍵盤關閉");

}

南昌APP制作開發(fā)公司-百恒網(wǎng)絡在此還要跟大家說明的是，注冊通知在viewWillAppear:方法中進行，解除通知在viewWillDisappear:方法中進行。keyboardDidShow:消息是在鍵盤打開時發(fā)出的，keyboardDidHide:消息是在鍵盤關閉時發(fā)出的。

看完以上介紹后，大家是否對關于IOS中關閉和打開鍵盤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，可隨時來電和我們聯(lián)系，我們專業(yè)為您講解。此外，本公司專注于APP開發(fā)、南昌做網(wǎng)站、微信開發(fā)等方面的服務，如有需要，百恒隨時為您效勞!