Question

我正在尝试创建Any.DO应用的副本。 tableHeaderView是一个“NewTaskCell”视图，其中包含一个UITextField。出于某种原因，在键盘出现后，tableView无法一直滚动到底部。这是我尝试过的：

更改tableView的框架
更改tableView的边界
更改tableView的contentSize
键盘解除后更新页脚视图

它必须与键盘或文本字段有关，因为它只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。之后，如果我点击加号按钮并且不显示键盘，那么它可以滚动到底部罚款。

以下是整个项目的源代码：Any.DO

这就是我的viewDidLoad方法。

- (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];
}

单击+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];
    }];
}

这就是问题所在：

issue

Answer 1

看起来您的UITableView被状态栏偏移了20px。你应该将你的UITableView的高度减少20px并且它将被修复。

Answer 2

无法理解您在代码中尝试做什么。

但是，看看动画，我想，你只需要将tableview.frame的高度降低10-20分。

这种行为通常出现在内容＆amp;框架高度大于可见区域。设置框架高度以匹配可见区域的高度将使您的表格视图滚动。

Answer 3

我通过将此代码添加到showTableView方法中解决了这个问题：

[[self tableView] setContentInset: UIEdgeInsetsMake(REFRESH_HEADER_HEIGHT, 0, 0, 0)];
[[self tableView] setContentInset: UIEdgeInsetsMake(0, 0, 0, 0)];

Answer 4

如果该偏移是问题 - 一个选项来解决它，只需为该ViewController进行全屏应用。

这个问题回答你如何 - Is this the right way to make an iPad app full screen?

Answer 5

对于未来，在 iOS7 上遇到类似问题的人可以做这样的事情

 [[self tableView] setContentInset: UIEdgeInsetsMake(0, 0, self.bottomLayoutGuide.length, 0)];

topLayoutGuide和bottomLayoutGuide是自动布局的一部分，length可供两者使用，它是一个很棒的功能。

Answer 6

有一个类似的问题并通过删除正在设置TableVC的contentInset的viewWillLayoutSubviews中的代码来解决它：

#include "stdafx.h"
#include <iostream>
#include <vector>

using namespace std;


class Element
{
    public:
        int Center;

        Element(int center)
        {
            Center = center;
        }
};

int main(int)
{
    cout << "Start...\n";
    vector<Element> Elements;

    // add test objects
    Elements.push_back(Element(20));
    Elements.push_back(Element(-370));
    Elements.push_back(Element(128));
    Elements.push_back(Element(77));
    Elements.push_back(Element(-489));
    //cout << "value of a: " << Elements.size() << endl;

    for (vector<Element>::size_type i = 0; i != Elements.size(); i++) {
        cout << "value of a: " << Elements[i].Center << endl;
    }

    return 0;
}

我不明白的是，为什么设置插图，特别是如上图所示不设置底部插件时，会有什么不同？因此，通过不设置它们，可能将插件设置为默认的UIEdgeInsetsZero，它以某种方式解决了这个问题。 Methinks这可能是一个iOS错误。我注意到我只能用32位设备解决这个问题。

Answer 7

您可能正在将tableView框架设置为整个屏幕，其中还包括状态栏。将tableView的高度降低到20像素

[[self tableView] setFrame:CGRectOffset(self.tableView.frame, 0, -20)];

或将框架设置为self.view.frame

键盘解除后，UITableView无法滚动到底部

7 个答案: