iphone - 设置编辑 :animated: is missing animation?

Question

我在 iOS 编程时遇到了一个问题:当我尝试为我的 tableView 制作自定义编辑按钮时，我无法将其设置为动画。下面是我如何初始化 tableview:

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

    myTableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame] style:UITableViewStylePlain]; 
    myTableView.delegate = self; 
    myTableView.dataSource = self; 

    myTableView.autoresizesSubviews = YES; 

    .......

    self.view = myTableView; 

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(setEditing:animated:)];     
    self.navigationItem.rightBarButtonItem = addButton; 
    [addButton release]; 
} 

但是，当我使用 self.editButtonItem 而不是我的 addButton 时，编辑模式是动画的。这是我的 setEditing:animated: 方法。我可以让我的 tableview 进入编辑模式，插入按钮立即出现在左边。我试过 [myTableView reloadRowsAtIndexPaths:[myTableView indexPathsForVisibleRows] withRowAnimation:UITableViewRowAnimationAutomatic];但它对 iOS 4.3 没有帮助。

- (void)setEditing:(BOOL)editing animated:(BOOL)animated{ 

if(self.editing){ 
    [super setEditing:NO animated:YES]; 
    [myTableView reloadRowsAtIndexPaths:[myTableView indexPathsForVisibleRows] withRowAnimation:UITableViewRowAnimationAutomatic]; 
    [myTableView reloadData]; 
    self.navigationItem.title = [selectedCellItem valueForKey:@"name"]; 
    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(setEditing:animated:)];  
    self.navigationItem.rightBarButtonItem = addButton; 
    [self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStylePlain]; 
    [addButton release]; 
} 
else { 
    [super setEditing:YES animated:YES]; 
    [myTableView reloadRowsAtIndexPaths:[myTableView indexPathsForVisibleRows] withRowAnimation:UITableViewRowAnimationAutomatic]; 
    self.navigationItem.title = @"Add to Favourites"; 
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(setEditing:animated:)];     
    self.navigationItem.rightBarButtonItem = doneButton; 
    [self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStyleDone]; 
    [doneButton release]; 
    [myTableView reloadData]; 
} 

} 

Answer 1

我认为您分配的选择器不能发送两个参数:

@selector(setEditing:animated:)

按钮操作通常不发送任何参数，或者本身作为参数(通常是 (id)sender)。所以你所做的可能被解释为发送 NO 作为第二个参数(所以 animated = NO)。

你应该像这样添加一个新方法:

-(void)toggleEditing
{
    [self setEditing:!self.isEditing animated:YES];
}

然后在你的按钮上设置 Action :

@selector(toggleEditing)

编辑

好的，这里有一些更详细的代码给你。

对于初学者来说，您的初始代码示例应该在 viewDidLoad 而不是 viewWillAppear 中。它应该看起来像这样:

- (void)viewDidLoad 
{ 
    [super viewDidLoad];

    .... code where you set up the table view...

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(toggleEditing)];     
    self.navigationItem.rightBarButtonItem = addButton; 
    [addButton release]; 
} 

您的setEditing 方法应该是这样的:

- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
    [super setEditing:editing animated:animated];
    if (editing)
    {
        // We are changing to edit mode
        UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(toggleEditing)];     
        self.navigationItem.rightBarButtonItem = doneButton; 
        [self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStyleDone]; 
        [doneButton release];
        self.navigationItem.title = @"Add to Favourites";
    }
    else
    {
        // We are changing out of edit mode
        self.navigationItem.title = [selectedCellItem valueForKey:@"name"]; 
        UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(toggleEditing)];  
        self.navigationItem.rightBarButtonItem = addButton; 
        [self.navigationItem.rightBarButtonItem setStyle:UIBarButtonItemStylePlain]; 
        [addButton release];
        self.navigationItem.title = [selectedCellItem valueForKey:@"name"];
    } 
}