你可以子类化UIBarButtonItem
并实施UIAccessibilityIdentification
比方说,该子类中的协议BarButtonWithAccesibility
.
In BarButtonWithAccesibility.h
:
@interface BarButtonWithAccesibility : UIBarButtonItem<UIAccessibilityIdentification>
@property(nonatomic, copy) NSString *accessibilityIdentifier NS_AVAILABLE_IOS(5_0);
遵守此协议的唯一(严格)要求是定义accessibilityIdentifier
财产。
现在在你的视图控制器中,让我们说viewDidLoad
,您可以设置一个 UIToolbar 并添加您的子类 UIBarButtonItem:
#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];
}
并在buttonPressed:
您可以验证您是否有权访问accessibilityIdentifier
:
- (void)buttonPressed:(id)sender{
if ([sender isKindOfClass:[BarButtonWithAccesibility class]]) {
BarButtonWithAccesibility *theButton = (BarButtonWithAccesibility *)sender;
NSLog(@"My accesibility identifier is: %@", theButton.accessibilityIdentifier);
}
}
希望这可以帮助。