1 - (void)viewDidLoad 2 { 3 [super viewDidLoad]; 4 5 self.editButtonItem.possibleTitles = [NSSet setWithObjects:@"编辑", @"完成", nil]; 6 self.editButtonItem.title = @"编辑"; 7 self.navigationItem.leftBarButtonItem = self.editButtonItem; 8 } 9 10 - (void)setEditing:(BOOL)editing 11 animated:(BOOL)animated 12 { 13 [super setEditing:editing animated:animated]; 14 15 if (self.editing) { 16 self.editButtonItem.title = @"完成"; 17 } else { 18 self.editButtonItem.title = @"编辑"; 19 } 20 }
1 possibleTitles 2 The set of possible titles to display on the bar button. 3 4 @property(nonatomic, copy) NSSet *possibleTitles 5 Discussion 6 Use this property to provide a hint to the system on how to correctly size the bar button item to be wide enough to accommodate your widest title. Set the value of this property to an NSSet object containing all the titles you intend as possible titles for the bar button item. Use the actual text strings you intend to display. 7 8 This property applies to bar button items placed on navigation bars or toolbars. 9 10 Availability 11 Available in iOS 2.0 and later. 12 Related Sample Code 13 AccelerometerGraph 14 Declared In 15 UIBarButtonItem.h
。