Question

iOS4不支持setRightBarButtonItems:animated:的方法UINavigationItem。

如何重写此代码以在栏中右侧添加2个按钮？

[viewController.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:helpButton, settingsButton, nil] animated:YES];

感谢

Answer 1

您可以在将按钮的alpha添加到视图之前将其设置为0，然后将其值设置为1.0。

//..Create the buttons
//Make it invisible
helpButton.alpha = 0.0;
settingsButton.alpha = 0.0

//Add them to the navBar
[self.navigationController.navigationBar addSubview:helpButton];
[self.navigationController.navigationBar addSubview:settingsButton];

//Animate it to 1.0
[UIView animateWithDuration:0.3 animations:^(void) {
      helpButton.alpha = 1.0;
      settingsButton.alpha = 1.0
    }];

Answer 2

如果要在iOS4中显示多个按钮，则必须手动创建它们。

例如，您可以将titleView设置为自定义视图，并通过覆盖ViewController的setTitle来执行您想要的任何操作：

- (void)setTitle:(NSString *)title
{
        UIView *titleView = (UIView *)self.navigationItem.titleView;
        if(!titleView)
        {
            titleView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width, 40.0)];
            titleView.backgroundColor = [UIColor greenColor];
            self.navigationItem.titleView = titleView;
        }
}

您需要使用UIButton代替UIBarButtonItem。

setRightBarButtonItems：ios4中不支持动画

2 个答案: