变更记录

序号	录入时间	录入人	备注
1	2015-03-02	Alfred Jiang	-
2	2015-12-22	Alfred Jiang	-

方案名称

键盘 - 弹出与收起改变页面高度

关键字

键盘 \ Keyboard \ 弹出键盘 \ 收起键盘

需求场景

页面弹出键盘需要改变页面高度时

参考链接

（无）

详细内容

Swift 解决方案 ```swift deinit{ NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil) NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil) }

func setupNotification() { NSNotificationCenter.defaultCenter().addObserver(self,selector:Selector("keyboardDidShow:"),name:UIKeyboardWillShowNotification,object:nil) NSNotificationCenter.defaultCenter().addObserver(self,selector:Selector("keyboardWillHide:"),name:UIKeyboardWillHideNotification,object:nil) }

//Keyboard did show func keyboardDidShow(sender: NSNotification) { if let keyboardSize = (sender.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue()//此处需要注意一定要是UIKeyboardFrameEndUserInfoKey { let duration : NSTimeInterval = NSTimeInterval(sender.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as NSNumber)

    self.tableViewMain.layoutIfNeeded();
    UIView.animateWithDuration(duration, animations: { () -> Void in
        self.tableViewMain.contentInset.bottom = keyboardSize.height
        self.tableViewMain.layoutIfNeeded()
        self.showKeyboard = true
    })
}

}

//keyboard will hide func keyboardWillHide(sender: NSNotification){ if let keyboardSize = (sender.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() { let duration : NSTimeInterval = NSTimeInterval(sender.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as NSNumber)

    self.tableViewMain.layoutIfNeeded();
    UIView.animateWithDuration(duration, animations: { () -> Void in
        self.tableViewMain.contentInset.bottom = 0
        self.tableViewMain.layoutIfNeeded()
        self.showKeyboard = false
    })
}

}

2. Objective-C 解决方案
```objective-c
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}

- (void)setupNotification
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)keyboardWillShow:(NSNotification*)notification {
    _keyboardRect = [[[notification userInfo] objectForKey:_UIKeyboardFrameEndUserInfoKey] CGRectValue];
    _keyboardVisible = YES;

    // Shrink view's inset by the keyboard's height, and scroll to show the text field/view being edited
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:[[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
    [UIView setAnimationDuration:[[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]];

    self.view_center.frame = CGRectMake(0, 0, 320, 250);

    [UIView commitAnimations];
}

- (void)keyboardWillHide:(NSNotification*)notification {
    _keyboardRect = CGRectZero;
    _keyboardVisible = NO;

    // Restore dimensions to prior size
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationCurve:[[[notification userInfo] objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
    [UIView setAnimationDuration:[[[notification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue]];

    self.view_center.frame = CGRectMake(0, 100, 320, 250);

    [UIView commitAnimations];
}