IOS 不讓鍵盤擋住UITextField (自適應)

- (BOOL)textFieldShouldReturn:(UITextField *)textField   {              // When the user presses return, take focus away from the text field so that the keyboard is dismissed.         NSTimeInterval animationDuration = 0.30f;           [UIView beginAnimations:@"ResizeForKeyboard" context:nil];           [UIView setAnimationDuration:animationDuration];           CGRect rect = CGRectMake(0.0f, 0.0f, self.frame.size.width, self.frame.size.height);           self.frame = rect;    [UIView commitAnimations];    [textField resignFirstResponder];    return YES;        } #define Move_Height 80- (void)textFieldDidBeginEditing:(UITextField *)textField{            CGRect frame = textField.frame;    int offset = frame.origin.y + Move_Height - (self.frame.size.height - 216.0);//鍵盤高度216    NSTimeInterval animationDuration = 0.30f;                   [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];                   [UIView setAnimationDuration:animationDuration];    float width = self.frame.size.width;                   float height = self.frame.size.height;           if(offset > 0)    {        CGRect rect = CGRectMake(0.0f, -offset,width,height);                       self.frame = rect;           }           [UIView commitAnimations];       }