键盘遮挡住输入框的问题

注册键盘弹起与收起通知

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

-(void)keyboardWillShow:(NSNotification *)note{
NSDictionary *info = [note userInfo];
CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
_keyBoardHeight = keyboardSize.height;
CGRect frame = _colorText.frame;
int offset = frame.origin.y + 32 - (self.view.frame.size.height -_keyBoardHeight);
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
//将视图的Y坐标向上移动offset个单位，以使下面腾出地方用于软键盘的显示
if(offset > 0){
self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
}
[UIView commitAnimations];
}

//点击return或者回车键键盘消失

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
[textField resignFirstResponder];
return YES;
}

//输入完成后恢复视图
-(void)textFieldDidEndEditing:(UITextField *)textField{
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
[UIView commitAnimations];
}