iphone - 键盘关闭后 UITableView 无法滚动到底部

Question

我正在尝试创建 Any.DO 应用程序的副本。 tableHeaderView 是一个“NewTaskCell” View ，其中包含一个带有 UITextField 的 View 。出于某种原因，tableView 无法在键盘出现后一直滚动到底部。这是我尝试过的:

1. 改变tableView的框架
2. 更改 tableView 的边界
3. 改变tableView的contentSize
4. 在键盘关闭后更新页脚 View

它必须与键盘或文本字段有关，因为它只有在键盘出现时才会发生。

在下面的动画中，您可以看到如果我单击加号按钮并显示键盘，则 tableView 无法滚动到底部。在那之后，如果我单击加号按钮并且不显示键盘，那么它可以滚动到底部。

这里是整个项目的源代码:Any.DO

这是我的 viewDidLoad 方法中的内容。

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[self tableView] setAllowsSelection: YES];
    [[self tableView] setShowsVerticalScrollIndicator: NO];

    // Make sure there aren't any empty cells showing at the bottom
    // Caused initial error [[self tableView] setTableFooterView: [UIView new]];

    // Fixes error at first, until the keyboard shows up
    UIView *footer = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 45)];
footer.backgroundColor = [UIColor clearColor];
self.tableView.tableFooterView = footer;

    // Make the separators look right
    [[self tableView] setSeparatorStyle: UITableViewCellSeparatorStyleSingleLine];
    [[self tableView] setSeparatorColor: [UIColor colorWithWhite: 0.95 alpha: 1]];

    UINib *nibTwo = [UINib nibWithNibName: @"TaskCell" bundle: nil];
    [[self tableView] registerNib: nibTwo forCellReuseIdentifier: @"TaskCell"];

    // Create the new task cell to go above the tableView
    // --------------------------------------------------
    NewTaskCell *myNewTaskCell = [[NewTaskCell alloc] init];

    // Need to access it later to show the keyboard
    [self setTheNewTaskCell: myNewTaskCell];

    [[theNewTaskCell view] setFrame: CGRectMake(0, 0, 320, 44)];
    [[[theNewTaskCell reminderButton] layer] setOpacity: 0];
    [[[theNewTaskCell locationButton] layer] setOpacity: 0];
    [[[theNewTaskCell addTaskButton] layer] setOpacity: 0];

    // Assign a method for each button
    [[theNewTaskCell reminderButton] addTarget:self action:@selector(addReminder)     forControlEvents: UIControlEventTouchUpInside];
    [[theNewTaskCell locationButton] addTarget:self action:@selector(addLocationReminder) forControlEvents: UIControlEventTouchUpInside];
    [[theNewTaskCell addTaskButton] addTarget:self action:@selector(addTaskToList) forControlEvents: UIControlEventTouchUpInside];

    // Separator view
    UIView *separatorView = [[UIView alloc] initWithFrame: CGRectMake(0, 43, 320, 1)];
    [separatorView setBackgroundColor: [UIColor colorWithWhite: 0.5 alpha: 0.2]];
    [[theNewTaskCell view] addSubview: separatorView];

    [[self tableView] setTableHeaderView: [theNewTaskCell view]];
    [[self tableView] setContentInset: UIEdgeInsetsMake(-44, 0, 0, 0)];
    // ---------------------------------------------------
    // For Reordering
    [[self tableView] setEditing: YES];

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget: self action: @selector(longPress:)];
    [longPress setMinimumPressDuration: 0.3];
    [longPress setDelaysTouchesBegan: YES];

    [self setLongPressGesture: longPress];
    [[self tableView] addGestureRecognizer: longPress];
}

点击 + 按钮时的代码

-(void)makeNewTask
{
    // Create the fromPosition and toPosition of the label animation
    CGRect fromPosition;
    CGRect toPosition = CGRectMake(todayDayLabel.frame.origin.x +     todayDayLabel.superview.frame.origin.x, todayDayLabel.frame.origin.y + todayDayLabel.superview.frame.origin.y, todayDayLabel.frame.size.width, todayDayLabel.frame.size.height);

    if ([self dayType] == TaskDayTypeToday)
        fromPosition = toPosition;
    else if ([self dayType] == TaskDayTypeTomorrow)
        fromPosition = CGRectMake(tomorrowDayLabel.frame.origin.x + tomorrowDayLabel.superview.frame.origin.x, tomorrowDayLabel.frame.origin.y + tomorrowDayLabel.superview.frame.origin.y, tomorrowDayLabel.frame.size.width, tomorrowDayLabel.frame.size.height);
    else if ([self dayType] == TaskDayTypeUpcoming)
        fromPosition = CGRectMake(upcomingDayLabel.frame.origin.x + upcomingDayLabel.superview.frame.origin.x, upcomingDayLabel.frame.origin.y + upcomingDayLabel.superview.frame.origin.y, upcomingDayLabel.frame.size.width, upcomingDayLabel.frame.size.height);
    else
        fromPosition = CGRectMake(somedayDayLabel.frame.origin.x + somedayDayLabel.superview.frame.origin.x, somedayDayLabel.frame.origin.y + somedayDayLabel.superview.frame.origin.y, somedayDayLabel.frame.size.width, somedayDayLabel.frame.size.height);
    // -------------------------------------------------------------

    isLoading = YES;

    [[self tableView] reloadData];

    // Make sure the scroller doesn't show up on the side
    [[self tableView] setShowsVerticalScrollIndicator: NO];

    // Create the label and animate it -------------------------
    UILabel *lbl = [[[[[NSBundle mainBundle] loadNibNamed: @"DayCell" owner: self options:nil] objectAtIndex: 0] subviews] objectAtIndex: 0];

    if ([self dayType] == TaskDayTypeToday)
        [lbl setText: @"TODAY"];
    if ([self dayType] == TaskDayTypeTomorrow)
        [lbl setText: @"TOMORROW"];
    if ([self dayType] == TaskDayTypeUpcoming)
        [lbl setText: @"UPCOMING"];
    if ([self dayType] == TaskDayTypeSomeday)
        [lbl setText: @"SOMEDAY"];

    [self setTheDayLabel: lbl];
    [theDayLabel setFrame: fromPosition];

    [theDayLabel setTranslatesAutoresizingMaskIntoConstraints: YES];
    [[self tableView] addSubview: theDayLabel];

    // animate it moving to the right position
    if (!animateContentInset) {
        [[self tableView] setContentInset: UIEdgeInsetsMake(0, 0, 0, 0)];
        [[self tableView] setScrollEnabled: NO];
    }
    else {
        [UIView animateWithDuration: 0.4 delay: 0 options: UIViewAnimationOptionCurveEaseOut animations: ^{
            [[self tableView] setContentInset: UIEdgeInsetsMake(0, 0, 0, 0)];
            [theDayLabel setFrame: toPosition];
        } completion: ^(BOOL done){
            [[self tableView] setScrollEnabled: NO];
        }];
    }
    // ----------------------------------------------------------
    // Create the UIButton to get back to the tableView
    UIButton *backToTableView = [UIButton buttonWithType: UIButtonTypeCustom];
    [backToTableView setFrame: CGRectMake(1, 45, 320, 480)];
    [backToTableView addTarget: self action: @selector(showTableView) forControlEvents: UIControlEventTouchUpInside];

    [[self tableView] addSubview: backToTableView];

    // Show the keyboard
    [[theNewTaskCell theNewTaskTextField] setDelegate: self];
    //[[theNewTaskCell theNewTaskTextField] becomeFirstResponder];
}

backToTableView 按钮的代码

-(void)showTableView
{
    [theDayLabel setHidden: YES];

    [[self tableView] setScrollEnabled: YES];

    [UIView animateWithDuration: 0.4 animations:^{
        // self.tableView.contentInset = UIEdgeInsetsZero;
        [[self tableView] setContentInset: UIEdgeInsetsMake(-REFRESH_HEADER_HEIGHT, 0, 0, 0)];

        // Get the newTaskCell view, then get the textfield from that view
        [[theNewTaskCell theNewTaskTextField] setText: @""];
        [[theNewTaskCell addTaskButton] setAlpha: 0];
        [[theNewTaskCell reminderButton] setAlpha: 0];
        [[theNewTaskCell locationButton] setAlpha: 0];

        [[theNewTaskCell theNewTaskTextField] resignFirstResponder];

        // Remove the button to go back to the tableView
        for (UIView *v in [[self tableView] subviews]) {
            if (v.frame.origin.x == 1)
                [v removeFromSuperview];
        }

        isLoading = NO;

        [[self tableView] reloadData];
    }];
}

问题是这样的:

Answer 1

看起来您的 UITableView 被状态栏偏移了 20px。您应该将 UITableView 的高度降低 20 像素，它会得到修复。