在UIBarButtonItem上以编程方式设置辅助功能标识符

Question

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.

A UIBarButtonItem没有实现UIAccessibilityIdentification.但是有可能我可以分配一个辅助功能标识符吗？

Answer 1

我们可以说,你可以在子类中继承UIBarButtonItem和实现UIAccessibilityIdentification协议BarButtonWithAccesibility.

在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属性.

现在在你的视图控制器中,让我们说viewDidLoad,你可以设置一个UIToolbar并添加你的子类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];
}

在buttonPressed:您可以验证您有权访问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.

Answer 2

从 iOS 5 开始，您可以这样做：

UIBarButtonItem *btn = [[UIBarButtonItem alloc] init...;
btn.accessibilityLabel = @"Label";