blocks|key|4688984|text|从iOS+5开始，你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4688985|UIBarButtonItem+*btn+=+[[UIBarButtonItem+alloc]+init...;
btn.accessibilityLabel+=+@"Label";|code-block|syntax|javascript|4688986|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

As of iOS 5 you can do it like this:

<pre><code>UIBarButtonItem *btn = [[UIBarButtonItem alloc] init...;
btn.accessibilityLabel = @"Label";
</code></pre>

blocks|key|183134|text|如果你在里面创建了UIToolbar，如果你想以编程方式创建多个UIBarButtonItem，那么可以像这样访问它，并像下面这样设置accessibilityLabel：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|183135|++++-(void)viewDidAppear:(BOOL)animated
++++{
++++++++UIBarButtonItem+*infoButtonItem=[[UIBarButtonItem+alloc]initWithTitle:@"info"+style:UIBarButtonItemStyleBordered++target:self+action:@selector(infoButtonClicked)];
++++++++[self.customToolBar+setItems:[NSArray+arrayWithObject:infoButtonItem]];
//Here+if+you+have+muliple+you+can+loop+through+it+
+++++++UIView+*view+=+(UIView*)[self.customToolBar.items+objectAtIndex:0];
++++[view+setAccessibilityLabel:NSLocalizedString(@"Test",+@"")];
++++}|code-block|syntax|javascript|183136|entityMap^0|9|9|W|F|1V|I|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

If you have <code>UIToolbar</code> created inside that if you want to create multiple <code>UIBarButtonItem</code> programatically then it can be accessed like that and set <code>accessibilityLabel</code> as well like that below:-

<pre><code> -(void)viewDidAppear:(BOOL)animated
 {
 UIBarButtonItem *infoButtonItem=[[UIBarButtonItem alloc]initWithTitle:@"info" style:UIBarButtonItemStyleBordered target:self action:@selector(infoButtonClicked)];
 [self.customToolBar setItems:[NSArray arrayWithObject:infoButtonItem]];
//Here if you have muliple you can loop through it 
 UIView *view = (UIView*)[self.customToolBar.items objectAtIndex:0];
 [view setAccessibilityLabel:NSLocalizedString(@"Test", @"")];
 }
</code></pre>

blocks|key|183219|text|您可以创建UIBarButtonItem的子类，并在该子类中实现UIAccessibilityIdentification协议，比如BarButtonWithAccesibility。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|183220|在BarButtonWithAccesibility.h中|183221|@interface+BarButtonWithAccesibility+:+UIBarButtonItem<UIAccessibilityIdentification>

@property(nonatomic,+copy)+NSString+*accessibilityIdentifier+NS_AVAILABLE_IOS(5_0);|code-block|syntax|javascript|183222|遵守此协议的唯一(严格)要求是定义accessibilityIdentifier属性。|183223|现在，在视图控制器中，假设在viewDidLoad中，您可以设置一个UIToolbar并添加子类UIBarButtonItem：|183224|#import+"BarButtonWithAccesibility.h"

-+(void)viewDidLoad{

++++[super+viewDidLoad];

++++UIToolbar+*toolbar+=+[[UIToolbar+alloc]++initWithFrame:CGRectMake(0,+0,+320,+44)];

++++BarButtonWithAccesibility+*myBarButton+=+[[BarButtonWithAccesibility+alloc]+initWithBarButtonSystemItem:UIBarButtonSystemItemDone+target:self+action:@selector(buttonPressed:)];
++++myBarButton.accessibilityIdentifier+=+@"I+am+a+test+button!";

++++toolbar.items+=+[[NSArray+alloc]+initWithObjects:myBarButton,+nil];
++++[self.view+addSubview:toolbar];
}|183225|在buttonPressed:中，您可以验证您是否有权访问accessibilityIdentifier|183226|-+(void)buttonPressed:(id)sender{
++++if+([sender+isKindOfClass:[BarButtonWithAccesibility+class]])+{
++++++++BarButtonWithAccesibility+*theButton+=+(BarButtonWithAccesibility+*)sender;
++++++++NSLog(@"My+accesibility+identifier+is:+%25@",+theButton.accessibilityIdentifier);
++++}
}|183227|希望这能有所帮助。|183228|entityMap^0|5|F|W|T|1U|P|0|1|R|0|0|H|N|0|E|B|0|0|1|E|T|N|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|S|3|T|5|6|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]]|D|@]|E|$]]|$1|U|3|V|5|J|7|1N|8|@]|D|@]|E|$K|L]]|$1|W|3|X|5|6|7|1O|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|Z|$]]

You could subclass <code>UIBarButtonItem</code> and implement the <code>UIAccessibilityIdentification</code> protocol in that subclass, lets's say <code>BarButtonWithAccesibility</code>.

In <code>BarButtonWithAccesibility.h</code>:

<pre><code>@interface BarButtonWithAccesibility : UIBarButtonItem&lt;UIAccessibilityIdentification&gt;

@property(nonatomic, copy) NSString *accessibilityIdentifier NS_AVAILABLE_IOS(5_0);
</code></pre>

The only (strict) requirement for adhering to this protocol is defining the <code>accessibilityIdentifier</code> property.

Now in your view controller, let's say in <code>viewDidLoad</code>, you could set up a UIToolbar and add your subclassed UIBarButtonItem:

<pre><code>#import "BarButtonWithAccesibility.h"

- (void)viewDidLoad{

 [super viewDidLoad];

 UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];

 BarButtonWithAccesibility *myBarButton = [[BarButtonWithAccesibility alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(buttonPressed:)];
 myBarButton.accessibilityIdentifier = @"I am a test button!";

 toolbar.items = [[NSArray alloc] initWithObjects:myBarButton, nil];
 [self.view addSubview:toolbar];
}
</code></pre>

And within the <code>buttonPressed:</code> you could verify that you have access to the <code>accessibilityIdentifier</code>:

<pre><code>- (void)buttonPressed:(id)sender{
 if ([sender isKindOfClass:[BarButtonWithAccesibility class]]) {
 BarButtonWithAccesibility *theButton = (BarButtonWithAccesibility *)sender;
 NSLog(@"My accesibility identifier is: %@", theButton.accessibilityIdentifier);
 }
}
</code></pre>

Hope this helps.

blocks|key|183306|text|子类化UIBarButtonItem是一个很好的解决方案。但是，根据您的需要，假设您的UIBarButtonItem使用自定义映像，那么简单地将accessibilityIdentifier分配给您的UIBarButtonItem的自定义映像可能更有意义。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|183307|entityMap^0|3|F|17|F|20|N|2S|F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

The subclassing <code>UIBarButtonItem</code> is a good solution. Depending on your needs, though, it may make more sense to simply assign the <code>accessibilityIdentifier</code> to the custom image of your <code>UIBarButtonItem</code>, assuming your <code>UIBarButtonItem</code> uses a custom image.

The accessibility identifier is a developer generated ID for GUI objects, which can be used for automation tests. 

A <code>UIBarButtonItem</code> does not implement <code>UIAccessibilityIdentification</code>. However is there a possibility that I can assign an accessibility identifier?

Setting accessibility identifier programmatically on UIBarButtonItem

可访问性标识符是开发人员为GUI对象生成的ID，可用于自动化测试。UIBarButtonItem不实现UIAccessibilityIdentification。但是，我是否可以分配一个可访问性标识符？

问在UIBarButtonItem上以编程方式设置辅助功能标识符
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