setEditing：animated：缺少动画？

Question

我在编程iOS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。下面是我的初始化实现代码如下：

- (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]; 
} 

然而，当我用self.editButtonItem而不是我的Add按钮，编辑模式是动画。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]; 但它在iOS 4.3上没有帮助。

- (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

我不认为你是分配选择能够发送两个参数：

@selector(setEditing:animated:) 

一个按钮动作通常只发送要么没有参数，或者本身作为一个参数（通常为(id)sender） 。所以你在做什么可能被解释为发送NO作为第二个参数（所以animated = NO）。

您应该添加一个新的方法，像这样：

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

，并设置你的按钮的操作：

@selector(toggleEditing) 

编辑

OK，这里是一些更详细的代码为你。

对于初学者来说，你最初的代码示例应在viewDidLoad而不是viewWillAppear。它应该是这个样子：

- (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]; 
} 

你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"]; 
    } 
}