项目开发中文本框输入的时候经常会用到键盘弹框遮挡的问题。解决办法就是根据底部键盘弹出的高度动态的改变对应view的位置。这里以多行文本框输入为例，效果图如下。

image

//第一步，注册监听键盘通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardShow:) name:UIKeyboardWillShowNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardHide:) name:UIKeyboardWillHideNotification object:nil];

//第二步，根据通知调整对应view的位置

pragma mark - 键盘的通知

• (void)keyboardShow:(NSNotification *)notify

{

//获取键盘弹框的位置信息

CGRect keyBoardRect = [notify.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

CGFloat deltaY = keyBoardRect.size.height/2;

//添加动画效果，向上偏移键盘高度的二分之一

[UIView animateWithDuration:[notify.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue] animations:^{

    self.bottomView.transform = CGAffineTransformMakeTranslation(0, -deltaY);

}];

}

• (void)keyboardHide:(NSNotification *)note

{

//位置还原

[UIView animateWithDuration:[note.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue] animations:^{

    self.bottomView.transform = CGAffineTransformIdentity;

} completion:^(BOOL finished){

}];

}

//第三步，不用的时候移除掉通知对象

-(void)dealloc{

[[NSNotificationCenter defaultCenter]removeObserver:self];

}