修改 editButtonItem.title

- (void)viewDidLoad

{

    [super viewDidLoad];

    

    self.editButtonItem.possibleTitles = [NSSet setWithObjects:@"编辑", @"完成", nil];

    self.editButtonItem.title = @"编辑";

    self.navigationItem.leftBarButtonItem = self.editButtonItem;

}

- (void)setEditing:(BOOL)editing

          animated:(BOOL)animated

{

    [super setEditing:editing animated:animated];

    

    if (self.editing) {

        self.editButtonItem.title = @"完成";

    } else {

        self.editButtonItem.title = @"编辑";

    }

}