Question

I have this code, which resizes the tableview when I click a textfield inside of a cell so that the keyboard doesn t overlap the bottom row. The problem is, after it resizes, it scrolls to the top of the table instead of the cell that I had clicked the textfield in.

- (void)keyboardDidShow:(NSNotification *)notification
{
    NSDictionary *userInfo = [notification userInfo];
    CGSize size = [[userInfo objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    CGRect frame = CGRectMake(self.vitalsTableView.frame.origin.x, 
                              self.vitalsTableView.frame.origin.y, 
                              self.vitalsTableView.frame.size.width, 
                              self.vitalsTableView.frame.size.height - size.height);
    self.vitalsTableView.frame = frame;

    VitalsTableViewCell *cell = (VitalsTableViewCell*)[self.selectedTextField superview];
    [self.vitalsTableView scrollRectToVisible:cell.frame animated:YES];
}

- (void)keyboardWillHide:(NSNotification *)notification
{
    NSDictionary *userInfo = [notification userInfo];
    CGSize size = [[userInfo objectForKey: UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    self.vitalsTableView.frame = CGRectMake(self.vitalsTableView.frame.origin.x, 
                                      self.vitalsTableView.frame.origin.y, 
                                      self.vitalsTableView.frame.size.width, 
                                      self.vitalsTableView.frame.size.height + size.height);
}

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    self.selectedTextField = textField;
//    [self scrollToRectOfTextField];
    NSIndexPath *path = [self.vitalsTableView indexPathForSelectedRow];
    [self.vitalsTableView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

- (void)scrollToRectOfTextField {
    VitalsTableViewCell *cell = (VitalsTableViewCell*)[self.selectedTextField superview];
    CGRect r = CGRectMake(self.selectedTextField.frame.origin.x, 
                          cell.frame.origin.y+self.selectedTextField.frame.origin.y,
                          self.selectedTextField.frame.size.width,
                          self.selectedTextField.frame.size.height);
    [self.vitalsTableView scrollRectToVisible:r animated:YES];
    NSIndexPath *path = [self.vitalsTableView indexPathForSelectedRow];
    [self.vitalsTableView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

Answer 1

当你改变表象框架时,它要求所有必要的方法加以重新编排,并抄录表概览中排在首位的<代码>contentOffset。每当您改变这个框架时,你们都必须向您所希望的<编码>CGPoint或发送。因此,首先,除了你想要发展点外,然后重新调整框架,然后与新框架相比向点倾斜。



我在你的法典中看到,你正在开车,但这是错开的。

- (void)scrollToRectOfTextField {
    VitalsTableViewCell *cell = (VitalsTableViewCell*)[self.selectedTextField superview];
    CGRect r = CGRectMake(self.selectedTextField.frame.origin.x, 
                          cell.frame.origin.y+self.selectedTextField.frame.origin.y,
                          self.selectedTextField.frame.size.width,
                          self.selectedTextField.frame.size.height);
    [self.vitalsTableView scrollRectToVisible:r animated:YES];
    NSIndexPath *path = [self.vitalsTableView indexPathForSelectedRow];
    [self.vitalsTableView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

首先,我走了最后两条线,一行走进指数道路。第二,如果你审查<代码>r.origin 或许,你可以找到一个点(0,0),因为案文实地框架的起源与其表面观点相对,而不是表格。可以通过使用<代码>convertRect:toView:来说明案文领域与表格观点的相对之处。文件here

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