iPhone,如何切换我的表格的编辑按钮然后切换到完成并返回编辑？

Question

我添加了我的编辑按钮

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

但我似乎无法将其转为完成和返回,控制台说它是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],它将从编辑/完成中正确切换状态,并且还将切换UIViewController自身的编辑模式.

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
}

或者你可以查询UIViewController它的当前编辑状态,如下所示:

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