键盘出现时如何移动视图

Question

我有多个UITextFields，当键盘出现时我需要向上移动视图。但我只需要 3 个底部字段，并且不想移动顶部其他字段的视图。我使用这个代码，但是当用户点击每个字段时它的移动视图，而不是当用户点击 2 个底部字段时我才需要移动视图

- (void)viewWillAppear:(BOOL)animated {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

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

#pragma mark - keyboard movements
- (void)keyboardWillShow:(NSNotification *)notification
{
    [UIView animateWithDuration:0.3 animations:^{
        CGRect f = self.view.frame;
        f.origin.y = -115.0f;  //set the -35.0f to your required value
        self.view.frame = f;
    }];
}

-(void)keyboardWillHide:(NSNotification *)notification
{
    [UIView animateWithDuration:0.3 animations:^{
        CGRect f = self.view.frame;
        f.origin.y = 0.0f;
        self.view.frame = f;
    }];
}

Answer 1

您可以在 UITextfield 委托方法 textFieldDidBeginEditing 中更改任何 UIViews、UIButton.... 的框架：当您点击文本字段时，此委托将调用

 - (void)textFieldDidBeginEditing:(UITextField *)textField{ 

      //here you will get the selected textfield
      //check whether the textfield is equal to any of three bottom field
       if(textfield==BottomTextfield)
       {
            //here you can change the frame of the UIViews
       }
   }

Answer 2

您需要使用UITextField's 委托方法更改UIView's 框架：

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    int tag = textField.tag;
    int section = tag / 1000;
    tag -= 1000 * section;
    section -= 1;

    CGPoint point = [[textField superview] convertPoint:textField.center toView:self.view];


    CGPoint contentOffset = tableView.contentOffset;

    if (IOS_7) {
        contentOffset.y += (point.y - 230);
        // Adjust this value as you need

    }
    else{
        contentOffset.y += (point.y - 150); // Adjust this value as you need

    }
    currentY = contentOffset.y;
    [tableView setContentOffset:contentOffset animated:YES];

}

- (void)textFieldDidEndEditing:(UITextField *)textField {
   [tableView setContentOffset:CGPointMake(0, 0)];
}

希望这会有所帮助...！！！

Answer 3

您可以检查第一响应者（活动文本字段）。这个 SO 答案显示了如何做到这一点：https://stackoverflow.com/a/1823360/2486394。并且仅移动某些文本字段的视图。