你的位置:首页 > 操作系统

[操作系统]键盘遮挡控件(textfield/textview.......)


采用的是通知的常规方式

  // 解决键盘遮挡问题
//选择didShow是因为需要键盘的高度
//选择willHide是因为视图frame重置需要优先于键盘消失,否则表现得不连贯
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHide:) name:UIKeyboardWillHideNotification object:nil];

触发的方法

-(void)keyboardWasShown:(NSNotification*)notification{  //获取键盘高度  NSValue* value=notification.userInfo[UIKeyboardFrameBeginUserInfoKey];  CGFloat keyBoradHeight=[value CGRectValue].size.height;  NSNumber* animationTime=notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];  double time=[animationTime doubleValue];  //获取被遮挡控件距离controller底部的距离  float a=self.view4.frame.origin.y+self.view4.frame.size.height;  float b = self.view.frame.size.height-a;  if (b<keyBoradHeight)  {    //动画效果    [UIView animateWithDuration:time             animations:^     {       //键盘被挡住了       CGRect viewCGrect=self.view.frame;       //视图应该上移所以是-       viewCGrect.origin.y=viewCGrect.origin.y-(keyBoradHeight-b);       [self.view setFrame:viewCGrect];     } completion:nil];  }}-(void)keyboardWasHide:(NSNotification*)notification{  NSValue* value=notification.userInfo[UIKeyboardFrameBeginUserInfoKey];  CGFloat keyBoradHeight=[value CGRectValue].size.height;  float a=self.view4.frame.origin.y+self.view4.frame.size.height;  float b = self.view.frame.size.height-a;       CGRect viewCGrect=self.view.frame;     viewCGrect.origin.y=viewCGrect.origin.y+(keyBoradHeight-b);     [self.view setFrame:viewCGrect];}

最后移除通知

-(void)viewWillDisappear:(BOOL)animated{  [super viewWillDisappear:animated];  [[NSNotificationCenter defaultCenter] removeObserver:self                          name:UIKeyboardWillHideNotification                         object:nil];  [[NSNotificationCenter defaultCenter] removeObserver:self                          name:UIKeyboardDidShowNotification                         object:nil];}