删除导航按钮

Question

嘿,我写了一个继承了一些功能的类(A),包括导航按钮的实现.A类同时具有查看和编辑模式,我只想在编辑模式下显示按钮.到目前为止,我无法删除此按钮,我真的不想创建另一个类只是为了编辑.

其他类也继承了这个功能,所以我真的不想弄乱父母.

我用来创建按钮的代码如下:

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];    
UIImage *buttonImage = [UIImage imageNamed:@"button.png"];

[button addTarget:self 
               action:@selector(buttonPressed:) 
     forControlEvents:UIControlEventTouchUpInside];

button.bounds = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height);

[button setBackgroundImage:buttonImage forState:UIControlStateNormal];
[button setTitle:NSLocalizedString(@"BUTTON", @"") 
            forState:UIControlStateNormal];

LPRBSLabel *buttonLabel = [[LPRBSLabel alloc] initWithStyle:UICustomeButtonTitle];
[button setTitleEdgeInsets:UIEdgeInsetsMake(0.0, 0.0, -5.0, 0.0)];

button.titleLabel.font = buttonLabel.font;
[button setTitleColor:buttonLabel.textColor forState:UIControlStateNormal];
[buttonLabel release];

UIBarButtonItem *barLeftInfoButton = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.leftBarButtonItem = barLeftInfoButton;
[barLeftInfoButton release];

Answer 1

我设法使用以下方法解决它:

self.navigationItem.leftBarButtonItem = nil;

我有一个心灵冻结,并在按钮实际创建时使用上面的语句:-(

Answer 2

将NavigationItem的属性"hidesBackButton"设置为yes会更容易:

http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UINavigationItem_Class/Reference/UINavigationItem.html#//apple_ref/occ/cl/UINavigationItem