iOS 关于键盘监听

step—1:键盘的监听

1.一般在viewWillAppear:方法中添加监听事件

- (void)viewWillAppear:(BOOL)animated{

[superviewWillAppear:animated]；

 //增加监听，当键盘出现或改变时收出消息

    [[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];

 //增加监听，当键退出时收出消息

    [[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotificationobject:nil];

}

//当键盘弹出时调用

- (void)keyboardWillShow:(NSNotification*)notification{

 //获取键盘的高度

 NSDictionary*userInfo = [notification userInfo];

 NSValue*value = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

 CGRectkeyboardRect = [value CGRectValue];

 CGFloatheight = keyboardRect.size.height;

 //第一种 self.view 平移的属性

 //self.view.transform=CGAffineTransformMakeTranslation(0,-height);

 //第二种 self.view frame的属性

 CGRectframe = self.view.frame;

    frame.origin.y= -height;

 self.view.frame= frame;

 NSLog(@"键盘打开...%@",NSStringFromCGRect(self.view.frame));

}

//当退出退出时调用

- (void)keyboardWillHide:(NSNotification*)notification{

 //获取键盘的高度

 NSDictionary*userInfo = [notification userInfo];

 NSValue*value = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

 CGRectkeyboardRect = [value CGRectValue];

 CGFloatheight = keyboardRect.size.height;

 //第一种 self.view 平移的属性

 //self.view.transform=CGAffineTransformIdentity;

 //self.view.transform=CGAffineTransformMakeTranslation(0,0);

 //第二种 self.view frame的属性

 CGRectframe = self.view.frame;

     frame.origin.y= 0;

 self.view.frame= frame;

 NSLog(@"键盘关闭...%@",NSStringFromCGRect(self.view.frame));

}

2.一般在viewWillDisappear:或dealloc 方法中移除

- (void)viewWillDisappear:(BOOL)animated{

    [superviewWillDisappear:animated];

 //解除键盘出现通知

    [[NSNotificationCenterdefaultCenter] removeObserver:selfname:UIKeyboardDidShowNotificationobject:nil];

 //解除键盘隐藏通知

    [[NSNotificationCenterdefaultCenter] removeObserver:selfname:UIKeyboardDidHideNotificationobject:nil];

}

- (void)dealloc{

 //解除键盘出现通知

    [[NSNotificationCenterdefaultCenter] removeObserver:selfname:UIKeyboardDidShowNotificationobject:nil];

 //解除键盘隐藏通知

    [[NSNotificationCenterdefaultCenter] removeObserver:selfname:UIKeyboardDidHideNotificationobject:nil];

}

Step—2:键盘的的种类

1>UIKeyboardTypeDefault：

2>UIKeyboardTypeASCIICapable：

3>UIKeyboardTypeNumbersAndPunctuation：

4>UIKeyboardTypeURL：

5>UIKeyboardTypeNumberPad：

6>UIKeyboardTypePhonePad：

7>UIKeyboardTypeNamePhonePad：

8>UIKeyboardTypeEmailAddress：

9>UIKeyboardTypeDecimalPad：

10>UIKeyboardTypeTwitter：

11>UIKeyboardTypeWebSearch：

12>UIKeyboardTypeAlphabet：