改变self.navigationItem的显示标题

 1 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 2 {
 3     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
 4     if (self)
 5     {
 6         
 7         self.navigationItem.title = @"我收藏的优惠券";
 8         self.editButtonItem.possibleTitles = [NSSet setWithObjects:@"编辑", @"完成", nil];
 9         self.navigationItem.rightBarButtonItem = self.editButtonItem;
10         self.editButtonItem.title = @"编辑";
11         
12     }
13     return self;
14 }
15 //设置可以编辑；
16 -(void)setEditing:(BOOL)editing animated:(BOOL)animated
17 {
18     
19     [super setEditing:editing animated:animated];
20     if (self.editing) {
21         self.editButtonItem.title = @"完成";
22     }
23     else {
24         self.editButtonItem.title = @"编辑";
25     }
26     [discountTableView setEditing:editing animated:animated];
27     
28 }