setEditing：animated：缺少動畫？

Question

我在編程iOS時遇到了一個問題：當我嘗試爲我的tableView製作自定義編輯按鈕時，我無法將其設置爲動畫。下面是我的初始化實現代碼如下：

- (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，當我用self.editButtonItem而不是我的Add按鈕，編輯模式是動畫。這是我的setEditing：animated：方法。我可以讓我的tableview進入編輯模式，插入按鈕立即出現在左邊。我試過[myTableView reloadRowsAtIndexPaths:[myTableView indexPathsForVisibleRows] withRowAnimation:UITableViewRowAnimationAutomatic]; 但它在iOS 4.3上沒有幫助。

- (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

我不認爲你是分配選擇能夠發送兩個參數：

@selector(setEditing:animated:) 

一個按鈕動作通常只發送要麼沒有參數，或者本身作爲一個參數（通常爲(id)sender） 。所以你在做什麼可能被解釋爲發送NO作爲第二個參數（所以animated = NO）。

您應該添加一個新的方法，像這樣：

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

，並設置你的按鈕的操作：

@selector(toggleEditing) 

編輯

OK，這裏是一些更詳細的代碼爲你。

對於初學者來說，你最初的代碼示例應在viewDidLoad而不是viewWillAppear。它應該是這個樣子：

- (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方法應該是這樣的：

- (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"]; 
    } 
}