Question

我在编程iOS时遇到了一个问题：当我尝试为我的tableView创建自定义编辑按钮时，我就无法将其设置为动画。以下是我初始化tableview的方法：

- (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侧。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:)

按钮操作通常只发送无参数或自身作为参数（通常为(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];
}

并在按钮上设置操作：

@selector(toggleEditing)

修改

好的，这里有一些更详细的代码。

对于初学者，您的初始代码示例应该在viewDidLoad而不是viewWillAppear。看起来应该是这样的：

- (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"]; } }

setEditing：animated：缺少动画？

1 个答案: