当用户在表格视图中滑动单元格时,如何创建一个“更多”按钮(就像ios 7中的邮件应用程序)

我一直在这里和Cocoa Touch论坛上寻找这些信息,但我似乎找不到答案,我希望比我更聪明的人能给我一个解决方案。

我希望当用户滑动一个表格视图单元格时,显示多个编辑按钮(默认是删除按钮)。 在iOS 7的邮件应用程序中,你可以滑动删除,但会出现一个“更多”按钮。


当前回答

我希望你不能等到苹果公司给你你想要的东西,对吗?这是我的选择。

创建自定义单元格。有两个uiview吗

1. upper
2. lower

在下视图中,添加任何你需要的按钮。公正对待其行为 像任何其他ibaction。你可以决定动画时间,风格和任何东西。

现在添加一个uiswipegesture到上视图,并显示你的下视图在滑动手势。我以前这样做过,就我而言,这是最简单的选择。

希望能有所帮助。

其他回答

如何实施

看起来iOS 8打开了这个API。在Beta 2中有这样的功能提示。

为了让某些东西工作,在你的UITableView的委托上实现以下两个方法以获得所需的效果(参见示例的要点)。

- tableView:editActionsForRowAtIndexPath:
- tableView:commitEditingStyle:forRowAtIndexPath:

已知的问题

文档说tableView:commitEditingStyle:forRowAtIndexPath是:

使用uitableviewwroaction的编辑操作不会被调用——操作的处理程序将被调用。

然而,没有它,滑动就不能工作。即使方法存根是空白的,它现在仍然需要它。这显然是beta 2中的一个bug。

来源

https://twitter.com/marksands/status/481642991745265664 https://gist.github.com/marksands/76558707f583dbb8f870

原答案:https://stackoverflow.com/a/24540538/870028

更新:

示例代码与此工作(在Swift中):http://dropbox.com/s/0fvxosft2mq2v5m/DeleteRowExampleSwift.zip

示例代码在MasterViewController.swift中包含了这个易于遵循的方法,通过这个方法你可以得到OP截图中显示的行为:

override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [AnyObject]? {

    var moreRowAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "More", handler:{action, indexpath in
        println("MORE•ACTION");
    });
    moreRowAction.backgroundColor = UIColor(red: 0.298, green: 0.851, blue: 0.3922, alpha: 1.0);

    var deleteRowAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Delete", handler:{action, indexpath in
        println("DELETE•ACTION");
    });

    return [deleteRowAction, moreRowAction];
}

你需要子类化UITableViewCell和子类化方法willTransitionToState:(UITableViewCellStateMask)状态,该状态在用户滑动单元格时被调用。状态标志会让你知道是否显示删除按钮,并在那里显示/隐藏更多按钮。

不幸的是,这个方法既没有给你Delete按钮的宽度,也没有给你动画时间。所以你需要观察并将More按钮的帧和动画时间硬编码到你的代码中(我个人认为苹果需要在这方面做些什么)。

这里有一个简单的解决办法。它能够在UITableViewCell中显示和隐藏自定义UIView。 显示逻辑包含在从UITableViewCell, BaseTableViewCell扩展的类中。

BaseTableViewCell.h

#import <UIKit/UIKit.h>

@interface BaseTableViewCell : UITableViewCell

@property(nonatomic,strong)UIView* customView;

-(void)showCustomView;

-(void)hideCustomView;

@end

BaseTableViewCell。米

#import "BaseTableViewCell.h"

@interface BaseTableViewCell()
{
    BOOL _isCustomViewVisible;
}

@end

@implementation BaseTableViewCell

- (void)awakeFromNib {
    // Initialization code
}

-(void)prepareForReuse
{
    self.customView = nil;
    _isCustomViewVisible = NO;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

-(void)showCustomView
{
    if(nil != self.customView)
    {
        if(!_isCustomViewVisible)
        {
            _isCustomViewVisible = YES;

            if(!self.customView.superview)
            {
                CGRect frame = self.customView.frame;
                frame.origin.x = self.contentView.frame.size.width;
                self.customView.frame = frame;
                [self.customView willMoveToSuperview:self.contentView];
                [self.contentView addSubview:self.customView];
                [self.customView didMoveToSuperview];
            }

            __weak BaseTableViewCell* blockSelf = self;
            [UIView animateWithDuration:.5 animations:^(){

                for(UIView* view in blockSelf.contentView.subviews)
                {
                    CGRect frame = view.frame;
                    frame.origin.x = frame.origin.x - blockSelf.customView.frame.size.width;
                    view.frame = frame;
                }
            }];
        }
    }
}

-(void)hideCustomView
{
    if(nil != self.customView)
    {
        if(_isCustomViewVisible)
        {
            __weak BaseTableViewCell* blockSelf = self;
            _isCustomViewVisible = NO;
            [UIView animateWithDuration:.5 animations:^(){
                for(UIView* view in blockSelf.contentView.subviews)
                {
                    CGRect frame = view.frame;
                    frame.origin.x = frame.origin.x + blockSelf.customView.frame.size.width;
                    view.frame = frame;
                }
            }];
        }
    }
}

@end

要获得此功能,只需从BaseTableViewCell扩展您的表视图单元格。

接下来, 在UIViewController中,它实现了UITableViewDelegate,创建了两个手势识别器来处理左右滑动。

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self.tableView registerNib:[UINib nibWithNibName:CUSTOM_CELL_NIB_NAME bundle:nil] forCellReuseIdentifier:CUSTOM_CELL_ID];

    UISwipeGestureRecognizer* leftSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleLeftSwipe:)];
    leftSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.tableView addGestureRecognizer:leftSwipeRecognizer];

    UISwipeGestureRecognizer* rightSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSwipe:)];
    rightSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
    [self.tableView addGestureRecognizer:rightSwipeRecognizer];
}

然后添加两个滑动处理程序

- (void)handleLeftSwipe:(UISwipeGestureRecognizer*)recognizer
{
    CGPoint point = [recognizer locationInView:self.tableView];
    NSIndexPath* index = [self.tableView indexPathForRowAtPoint:point];

    UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:index];

    if([cell respondsToSelector:@selector(showCustomView)])
    {
        [cell performSelector:@selector(showCustomView)];
    }
}

- (void)handleRightSwipe:(UISwipeGestureRecognizer*)recognizer
{
    CGPoint point = [recognizer locationInView:self.tableView];
    NSIndexPath* index = [self.tableView indexPathForRowAtPoint:point];

    UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:index];

    if([cell respondsToSelector:@selector(hideCustomView)])
    {
        [cell performSelector:@selector(hideCustomView)];
    }
}

现在,在UITableViewDelegate的cellForRowAtIndexPath中,你可以创建自定义UIView并将它附加到dequeuedcell中。

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    CustomCellTableViewCell* cell = (CustomCellTableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"CustomCellTableViewCell" forIndexPath:indexPath];

    NSArray* nibViews = [[NSBundle mainBundle] loadNibNamed:@"CellCustomView"
                                                      owner:nil
                                                    options:nil];

    CellCustomView* customView = (CellCustomView*)[ nibViews objectAtIndex: 0];

    cell.customView = customView;

    return cell;
}

当然,这种加载自定义UIView的方式只适用于这个例子。按照您的意愿管理它。

在iOS 11中,这在UITableViewDelegate中是公开的。下面是一些示例代码:

斯威夫特

func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {

    let action = UIContextualAction(style: .normal, title: nil) { (_, _, _) in
        print("Swipe action tapped")
    }

    action.image = UIImage(systemName: "plus.slash.minus")
    action.backgroundColor = .green

    return UISwipeActionsConfiguration(actions: [action])
}

Objective - C

- (UISwipeActionsConfiguration *)tableView:(UITableView *)tableView trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath {
    UIContextualAction *delete = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleDestructive
                                                                         title:@"DELETE"
                                                                       handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
                                                                           NSLog(@"index path of delete: %@", indexPath);
                                                                           completionHandler(YES);
                                                                       }];

    UIContextualAction *rename = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal
                                                                         title:@"RENAME"
                                                                       handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
                                                                           NSLog(@"index path of rename: %@", indexPath);
                                                                           completionHandler(YES);
                                                                       }];

    UISwipeActionsConfiguration *swipeActionConfig = [UISwipeActionsConfiguration configurationWithActions:@[rename, delete]];
    swipeActionConfig.performsFirstActionWithFullSwipe = NO;

    return swipeActionConfig;
}

也可用:

- (UISwipeActionsConfiguration *)tableView:(UITableView *)tableView leadingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath;

文档:https://developer.apple.com/documentation/uikit/uitableviewdelegate/2902367-tableview?language=objc

这里有一种有点脆弱的方法,它不涉及私有api或构造自己的系统。你在对冲赌注,苹果不会打破这一点,希望他们会发布一个API,你可以用它来替换这几行代码。

KVO self.contentView.superview.layer.sublayer. Do this in init. This is the UIScrollView's layer. You can't KVO 'subviews'. When subviews changes, find the delete confirmation view within scrollview.subviews. This is done in the observe callback. Double the size of that view and add a UIButton to the left of its only subview. This is also done in the observe callback. The only subview of the delete confirmation view is the delete button. (optional) The UIButton event should look up self.superview until it finds a UITableView and then call a datasource or delegate method you create, such as tableView:commitCustomEditingStyle:forRowAtIndexPath:. You may find the indexPath of the cell by using [tableView indexPathForCell:self].

这还要求您实现标准表视图编辑委托回调。

static char kObserveContext = 0;

@implementation KZTableViewCell {
    UIScrollView *_contentScrollView;
    UIView *_confirmationView;
    UIButton *_editButton;
    UIButton *_deleteButton;
}

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        _contentScrollView = (id)self.contentView.superview;

        [_contentScrollView.layer addObserver:self
             forKeyPath:@"sublayers"
                options:0
                context:&kObserveContext];

        _editButton = [UIButton new];
        _editButton.backgroundColor = [UIColor lightGrayColor];
        [_editButton setTitle:@"Edit" forState:UIControlStateNormal];
        [_editButton addTarget:self
                        action:@selector(_editTap)
              forControlEvents:UIControlEventTouchUpInside];

    }
    return self;
}

-(void)dealloc {
    [_contentScrollView.layer removeObserver:self forKeyPath:@"sublayers" context:&kObserveContext];
}

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if(context != &kObserveContext) {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
        return;
    }
    if(object == _contentScrollView.layer) {
        for(UIView * view in _contentScrollView.subviews) {
            if([NSStringFromClass(view.class) hasSuffix:@"ConfirmationView"]) {
                _confirmationView = view;
                _deleteButton = [view.subviews objectAtIndex:0];
                CGRect frame = _confirmationView.frame;
                CGRect frame2 = frame;
                frame.origin.x -= frame.size.width;
                frame.size.width *= 2;
                _confirmationView.frame = frame;

                frame2.origin = CGPointZero;
                _editButton.frame = frame2;
                frame2.origin.x += frame2.size.width;
                _deleteButton.frame = frame2;
                [_confirmationView addSubview:_editButton];
                break;
            }
        }
        return;
    }
}

-(void)_editTap {
    UITableView *tv = (id)self.superview;
    while(tv && ![tv isKindOfClass:[UITableView class]]) {
        tv = (id)tv.superview;
    }
    id<UITableViewDelegate> delegate = tv.delegate;
    if([delegate respondsToSelector:@selector(tableView:editTappedForRowWithIndexPath:)]) {
        NSIndexPath *ip = [tv indexPathForCell:self];
        // define this in your own protocol
        [delegate tableView:tv editTappedForRowWithIndexPath:ip];
    }
}
@end