使用带有用于SplitView/Popover控件的图像或系统预设的UIBarButtonItem

Question

我正在优化iPad的应用程序,并希望使用带图像的UIBarButtonItem来呈现弹出框.如果我使用带有标题的按钮但我更喜欢使用我自己的图像或者使用UIBarButtonSystemItem提供的图像,那么我目前使用的代码效果很好.如果我根本没有设置按钮的标题,它就不会显示出来.如果我设置标题和图像,我会在真实硬件上获得标题,但图像显示在模拟器上.使用UIBarButtonSystemItem,我得到了我想要的按钮,但它也以横向模式显示(它不应该这样做,因为我使用横向视图的拆分视图).

使用setImage,setTitle的任意组合或将按钮初始化为系统预设都无效.当检测到旋转到横向但它仍然在屏幕上时,我也尝试将系统预设的按钮设置为nil.我不确定如何从这里开始,但我真的想避免在这个按钮上使用字符串,而且我很想知道为什么会这样.

这是代码:

#pragma mark Split view handling
-(void)splitViewController:(UISplitViewController *)svc 
    willHideViewController:(UIViewController *)aViewController 
         withBarButtonItem:(UIBarButtonItem *)barButtonItem 
      forPopoverController:(UIPopoverController *)pc
{
    //If this bar button item doesn't have a title, it won't appear at all.
    [barButtonItem setTitle:@"-"];
    //barButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize target:[barButtonItem target] action:[barButtonItem action]];
    [barButtonItem setImage:[UIImage imageNamed:@"listing.png"]];

    //Take this bar button item and put it on the left side of our nav item
    [[self navigationItem] setLeftBarButtonItem:barButtonItem];
    self.popoverController = pc;
}

-(void)splitViewController:(UISplitViewController *)svc 
    willShowViewController:(UIViewController *)aViewController 
 invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
    //Remove the bar button item from our navigation item.
    //We'll double check that it's the correct button, even though we know it is.
    if(barButtonItem == [[self navigationItem] leftBarButtonItem]){
        [[self navigationItem] setLeftBarButtonItem:nil];
    }
    self.popoverController = nil;
}

---

更新:

我把它添加到我的viewDidLoad:

customButtonItem = [[UIBarButtonItem alloc] initWithCustomView:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"listing.PNG"]]];
customButtonItem.style = UIBarButtonItemStyleBordered;

并更新了willHideViewController到这个:

-(void)splitViewController:(UISplitViewController *)svc 
    willHideViewController:(UIViewController *)aViewController 
         withBarButtonItem:(UIBarButtonItem *)barButtonItem 
      forPopoverController:(UIPopoverController *)pc
{
    //If this bar button item doesn't have a title, it won't appear at all
    customButtonItem.target = barButtonItem.target;
    customButtonItem.action = barButtonItem.action;
    barButtonItem = customButtonItem;
    [barButtonItem setTitle:@""];

    //barButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize target:[barButtonItem target] action:[barButtonItem action]];
    //[barButtonItem setImage:[UIImage imageNamed:@"listing.png"]];

    //Take this bar button item and put it on the left side of our nav item
    [[self navigationItem] setLeftBarButtonItem:barButtonItem];
    self.popoverController = pc;
}

这导致图像显示在我想要它的时间/位置,但按钮没有边框(尽管我设置它)并且没有呈现弹出窗口.

Answer 1

编辑:我错过了这是splitView委托,你从iOS接收UIBarButtonItem.所以我建议你做的是尝试以下方法.

创建自己的buttonItem,并从系统提供的目标和选择器中复制目标和选择器.像这样创建新的按钮项:

UIBarButtonItem *newBut = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleBordered target: barButtonItem.target action: barButtonItem.action];
[[self navigationItem] setLeftBarButtonItem:newBut];