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

Swift 3实际回答

这是你唯一需要的功能。对于自定义操作,您不需要CanEdit或CommitEditingStyle函数。

func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath) -> [UITableViewRowAction]? {
    let action1 = UITableViewRowAction(style: .default, title: "Action1", handler: {
        (action, indexPath) in
        print("Action1")
    })
    action1.backgroundColor = UIColor.lightGray
    let action2 = UITableViewRowAction(style: .default, title: "Action2", handler: {
        (action, indexPath) in
        print("Action2")
    })
    return [action1, action2]
}

其他回答

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

使用标准SDK是不可能实现的。然而,有各种各样的第三方解决方案或多或少地模仿了Mail.app中的行为。其中一些(例如MCSwipeTableViewCell, DAContextMenuTableViewController, RMSwipeTableViewCell)使用手势识别器检测滑动,其中一些(例如SWTableViewCell)在标准UITableViewCellScrollView (UITableViewCell的私有子视图)下面放置第二个UISScrollView,其中一些修改UITableViewCellScrollView的行为。

我最喜欢最后一种方法,因为触摸操作感觉最自然。具体来说,MSCMoreOptionTableViewCell很好。你的选择可能会根据你的具体需求而有所不同(你是否也需要从左到右平移,是否需要iOS 6兼容性等等)。还要注意,大多数这些方法都有一个负担:如果苹果在UITableViewCell子视图层次结构中做了改变,它们很容易在未来的iOS版本中被打破。

约翰尼的答案是正确的。我只是在objective-c中添加了下面的代码,以便初学者(以及那些拒绝学习Swift语法的人:)

确保你声明了uitableviewdelegate并拥有以下方法:

 -(NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath {
 UITableViewRowAction *button = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"Button 1" handler:^(UITableViewRowAction *action, NSIndexPath *indexPath)
    {
        NSLog(@"Action to perform with Button 1");
    }];
    button.backgroundColor = [UIColor greenColor]; //arbitrary color
    UITableViewRowAction *button2 = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"Button 2" handler:^(UITableViewRowAction *action, NSIndexPath *indexPath)
                                    {
                                        NSLog(@"Action to perform with Button2!");
                                    }];
    button2.backgroundColor = [UIColor blueColor]; //arbitrary color

    return @[button, button2]; //array with all the buttons you want. 1,2,3, etc...
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
// you need to implement this method too or nothing will work:

}
 - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
    {
        return YES; //tableview must be editable or nothing will work...
    }

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

斯威夫特4

func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
    let delete = UIContextualAction(style: .destructive, title: "Delete") { (action, sourceView, completionHandler) in
        print("index path of delete: \(indexPath)")
        completionHandler(true)
    }
    let rename = UIContextualAction(style: .normal, title: "Edit") { (action, sourceView, completionHandler) in
        print("index path of edit: \(indexPath)")
        completionHandler(true)
    }
    let swipeActionConfig = UISwipeActionsConfiguration(actions: [rename, delete])
    swipeActionConfig.performsFirstActionWithFullSwipe = false
    return swipeActionConfig
}