xcode 使用 StoryBoards 以编程方式设置 UITabBarItem 图标？
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Programmatically setting UITabBarItem icons with StoryBoards?
提问by Will Larche
I want to use a UITabBarSystemItem for the icon of one of my tabBarItem's but I'm using storyboards. I'm not sure where to set it. If I set it in the view's viewDidLoad then it doesn't change until you push the button in the tabBar. Before that it's just the blue ? square.
我想使用 UITabBarSystemItem 作为我的 tabBarItem 之一的图标，但我使用的是故事板。我不确定在哪里设置它。如果我在视图的 viewDidLoad 中设置它，那么它不会改变，直到你按下 tabBar 中的按钮。在此之前，它只是蓝色？正方形。
And as far as I know, you can't use UITabBarSystemItems in IB inspector.
据我所知，您不能在 IB 检查器中使用 UITabBarSystemItems。
UPDATE:
更新：
Well first of all I'm an idiot. You can totally choose the icon in the IB Inspector.
好吧，首先我是个白痴。您完全可以在 IB Inspector 中选择图标。
Tab Bar Item -> Identifier -> Choose your icon.
标签栏项目 -> 标识符 -> 选择你的图标。
But the question still remains how to do it programmatically. Or rather when/where?
但问题仍然是如何以编程方式做到这一点。或者更确切地说是何时/何地？
回答by John F
When using storyboards, a view controller initializes using the initWithCoder constructor so you could override that function and set the system item icon there like so
使用故事板时，视图控制器使用 initWithCoder 构造函数进行初始化，因此您可以覆盖该函数并像这样设置系统项图标
- (id)initWithCoder:(NSCoder*)aDecoder
{
if(self = [super initWithCoder:aDecoder])
{
self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemFavorites tag:1];
}
return self;
}
Naturally, you can change the value of the system item to any of the values supported. Apple lists them here
当然，您可以将系统项的值更改为支持的任何值。苹果在这里列出了它们
回答by iCreative
Check this code for your problem: Its working in my app.
检查此代码是否存在您的问题：它在我的应用程序中工作。
- (NSArray *) initializeViewControllers
{
NSArray *viewControllerArray = nil;
viewController1 = <View Init Code>
viewController2 = <View Init Code>
viewController3 = <View Init Code>
1stNavController = [[UINavigationController alloc] initWithRootViewController:viewController1];
UIImage *img = [UIImage imageNamed:@"tab_home"];
[1stNavController .tabBarItem initWithTitle:@"Home" image:img tag:1];
2ndNavController = [[UINavigationController alloc] initWithRootViewController:viewController2];
img = [UIImage imageNamed:@"tab_timeDrop"];
[2ndNavController .tabBarItem initWithTitle:@"Time Entry" image:img tag:2];
3rdNavController = [[UINavigationController alloc] initWithRootViewController:viewController3];
img = [UIImage imageNamed:@"tab_invoiceSummary"];
[3rdNavController.tabBarItem initWithTitle:@"Invoice Summary" image:img tag:3];
viewControllerArray = [NSArray arrayWithObjects:1stNavController,2ndEntryNavController,3rdReportNavController, nil];
return viewControllerArray;
}
This code is returning View Controllers with Images for their respective tabs. Here i used Navigation Controller inside the tabbar controller. you can also use view controller instead of navigation Controller.
此代码为各自的选项卡返回带有图像的视图控制器。在这里，我在标签栏控制器中使用了导航控制器。您还可以使用视图控制器代替导航控制器。
Just add this code and initialize your tabbar controller as follows inside appdidfinishlaunchingmethod:
只需添加此代码并在appdidfinishlaunching方法中按如下方式初始化您的标签栏控制器：
tabbarController = [[UITabBarController alloc] init];
_tabbarController.viewControllers = [self initializeViewControllers];
self.window.rootViewController = tabbarController;
Hope it works.
希望它有效。
Please reply.
请回复。
回答by s.muellner
Well that's quite simple!
嗯，这很简单！
For the where -> create a custom TabBarController (e.g. WBTabBarController). In your StoryBoard explicitly set it.
对于 where -> 创建自定义 TabBarController（例如 WBTabBarController）。在您的 StoryBoard 中明确设置它。
For the how -> just overwrite viewDidLoad of the WBTabBarController and set your images for the TabBarItems. In the following example this was done using the NIKFontAwesomeIconFactory:
对于如何 -> 只需覆盖 WBTabBarController 的 viewDidLoad 并为 TabBarItems 设置图像。在以下示例中，这是使用 NIKFontAwesomeIconFactory 完成的：
#import "WBTabBarController.h"
#import "NIKFontAwesomeIcon.h"
#import "NIKFontAwesomeIconFactory.h"
#import "NIKFontAwesomeIconFactory+iOS.h"
@interface WBTabBarController ()
@end
@implementation WBTabBarController
- (void)viewDidLoad
{
[super viewDidLoad];
NIKFontAwesomeIconFactory *factory = [NIKFontAwesomeIconFactory tabBarItemIconFactory];
UITabBarItem *item0 = self.tabBar.items[0];
item0.image = [factory createImageForIcon:NIKFontAwesomeIconApple];
UITabBarItem *item1 = self.tabBar.items[1];
item1.image = [factory createImageForIcon:NIKFontAwesomeIconStackOverflow];
}
@end
回答by jrturton
Assuming the initial scene of your storyboard is the tab bar view controller, you can access it in applicationDidFinishLaunching, it is the rootViewControllerof the app delegate's window. I don't know if you can swap in a system item if the bar item is already present, but you can definitely set the image and title.
假设故事板的初始场景是标签栏视图控制器，您可以在 applicationDidFinishLaunching 中访问它，它是rootViewController应用程序委托的window. 如果栏项目已经存在，我不知道您是否可以交换系统项目，但您绝对可以设置图像和标题。
