从事南昌APP开发的技术人员都知道，在关闭和打开键盘时，iOS系统分别会发出如下广播通知：UIKeyboardDidHideNotification和UIKeyboardDid- ShowNotification。使用广播通知的时候，百恒网络认为大家需要注意的是要在合适的时机注册和解除通知，而ViewController中的有关代码如下：
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
//注册键盘出现通知
NSNotificationCenter.defaultCenter().addObserver(self, selector:
"keyboardDidShow:", name: UIKeyboardDidShowNotification,object: nil)
//注册键盘隐藏通知
NSNotificationCenter.defaultCenter().addObserver(self, selector:
"keyboardDidHide:", name: UIKeyboardDidHideNotification,object: nil)
}
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
//解除键盘出现通知
NSNotificationCenter.defaultCenter().removeObserver(self, name:UIKeyboardDidShowNotification, object: nil)
//解除键盘隐藏通知
NSNotificationCenter.defaultCenter().removeObserver(self, name:UIKeyboardDidHideNotification, object: nil)
}
func keyboardDidShow(notification: NSNotification) {
NSLog("键盘打开")
}
func keyboardDidHide(notification: NSNotification) {
NSLog("键盘关闭")
}
-(void) viewWillAppear:(BOOL)animated {
//注册键盘出现通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector (keyboardDidShow:)
name: UIKeyboardDidShowNotification object:nil];
//注册键盘隐藏通知
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector (keyboardDidHide:)
name: UIKeyboardDidHideNotification object:nil];
[super viewWillAppear:animated];
}
-(void) viewWillDisappear:(BOOL)animated {
//解除键盘出现通知
[[NSNotificationCenter defaultCenter] removeObserver:self
name: UIKeyboardDidShowNotification object:nil];
//解除键盘隐藏通知
[[NSNotificationCenter defaultCenter] removeObserver:self
name: UIKeyboardDidHideNotification object:nil];
[super viewWillDisappear:animated];
}
-(void) keyboardDidShow: (NSNotification *)notif {
NSLog(@"键盘打开");
}
-(void) keyboardDidHide: (NSNotification *)notif {
NSLog(@"键盘关闭");
}
南昌APP制作开发公司-百恒网络在此还要跟大家说明的是，注册通知在viewWillAppear:方法中进行，解除通知在viewWillDisappear:方法中进行。keyboardDidShow:消息是在键盘打开时发出的，keyboardDidHide:消息是在键盘关闭时发出的。
看完以上介绍后，大家是否对关于IOS中关闭和打开键盘的通知使用方法有所了解了呢? 如果还有哪些不太明白的地方，可随时来电和我们联系，我们专业为您讲解。此外，本公司专注于APP开发、南昌做网站、微信开发等方面的服务，如有需要，百恒随时为您效劳!
