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

  1. 页面弹出键盘需要改变页面高度时

参考链接

（无）

详细内容

  1. Swift 解决方案
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    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
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    - (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];
    }

效果图

（无）

备注