iPhone，如何将表格的“编辑”按钮切换到“完成”，然后再切换回“编辑”？

Question

我添加了编辑按钮

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] 
        initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self 
        action:@selector(editNavButtonPressed)] autorelease];

但我似乎无法将其转到“完成”并返回，控制台显示其为 Null

-(IBAction)editNavButtonPressed
{
//[self.tableView setEditing:YES animated:YES];
BOOL editing = !self.tableView.editing;
NSLog(@"tile=#%@#", self.navigationItem.rightBarButtonItem.title);

if ([self.navigationItem.rightBarButtonItem.title isEqualToString:NSLocalizedString(@"Edit", @"Edit")]) {
    self.navigationItem.rightBarButtonItem.title = NSLocalizedString(@"Done", @"Done");
} else {
    self.navigationItem.rightBarButtonItem.title = NSLocalizedString(@"Edit", @"Edit");

}
//self.navigationItem.rightBarButtonItem.enabled = !editing;
//self.navigationItem.rightBarButtonItem.title = (editing) ? NSLocalizedString(@"Done", @"Done") : NSLocalizedString(@"Edit", @"Edit");
[self.tableView setEditing: editing animated: YES];

}

Answer 1

您应该使用-[UIViewController editButtonItem]，它将正确地从“编辑”/“完成”切换状态，并且还将在UIViewController本身上切换编辑模式。

设置如下:

-(void)viewDidLoad {
   self.navigationItem.rightBarButtonItem = [self editButtonItem];
}

然后，您可以覆盖-[UIViewController setEditing:animated:]，以便在切换编辑模式时立即收到通知。

-(void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    // Add your custom code here
}

或者您可以查询 UIViewController 的当前编辑状态，如下所示:

if ([self isEditing]) {
    // Do something editing like
} else {
    // Do whatever is not editing like.
}