iphone - 如何禁用 UINavigationBarItem？

Question

我正在尝试禁用添加到导航 Controller 栏的按钮。这是我添加它的方法:

UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithTitle:@"Add" style:UIBarButtonItemStylePlain target:self action:@selector(addNew)];          
self.navigationItem.rightBarButtonItem = addButton;
[addButton release];

启用/禁用此类项目的最佳方法是什么？我已经尝试过这段代码:

addButton.disabled = YES;

但这当然行不通。任何帮助，将不胜感激。谢谢。

编辑:应该是 addButton.enabled = YES;

哎呀

Answer 1

如果你在 header 中定义了addButton，并@synthesize它，那么你将能够使用addButton.enabled = NO;，没有“disabled” setter 。

.h

@interface MyViewController {
    UIBarButtonItem *addButton;
}
@property(nonatomic,retain) UIBarButtonItem *addButton;
@end

.m

@implementation MyViewController
@synthesize addButton;

-(void)viewDidLoad{
    addButton = [[UIBarButtonItem alloc] initWithTitle:@"Add" style:UIBarButtonItemStylePlain target:self action:@selector(addNew)];          
    self.navigationItem.rightBarButtonItem = addButton;
    [addButton release];
}
-(void)DoSomething{
    addButton.enabled = NO;
}