使用objective c中的CAPSPageMenu检测我们在哪个选项卡中

#import "CAPSPageMenu.h"

@interface ViewController () <CAPSPageMenuDelegate>

@property (nonatomic) CAPSPageMenu *pageMenu;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 设置选项卡的视图控制器
    UIViewController *viewController1 = [[UIViewController alloc] init];
    viewController1.title = @"选项卡1";
    
    UIViewController *viewController2 = [[UIViewController alloc] init];
    viewController2.title = @"选项卡2";
    
    // 设置选项卡的属性
    NSDictionary *parameters = @{
        CAPSPageMenuOptionScrollMenuBackgroundColor: [UIColor whiteColor],
        CAPSPageMenuOptionViewBackgroundColor: [UIColor whiteColor],
        CAPSPageMenuOptionSelectionIndicatorColor: [UIColor redColor],
        CAPSPageMenuOptionBottomMenuHairlineColor: [UIColor grayColor],
        CAPSPageMenuOptionMenuItemFont: [UIFont systemFontOfSize:15.0],
        CAPSPageMenuOptionMenuHeight: @(40.0),
        CAPSPageMenuOptionMenuItemWidth: @(90.0),
        CAPSPageMenuOptionCenterMenuItems: @(YES)
    };
    
    // 创建CAPSPageMenu实例
    self.pageMenu = [[CAPSPageMenu alloc] initWithViewControllers:@[viewController1, viewController2] frame:CGRectMake(0.0, 0.0, self.view.frame.size.width, self.view.frame.size.height) options:parameters];
    
    // 设置代理
    self.pageMenu.delegate = self;
    
    // 将CAPSPageMenu视图添加到当前视图
    [self.view addSubview:self.pageMenu.view];
}

#pragma mark - CAPSPageMenuDelegate

- (void)willMoveToPage:(UIViewController *)controller index:(NSInteger)index {
    // 在选项卡切换之前执行的操作
    NSLog(@"将要切换到选项卡 %ld", (long)index);
}

- (void)didMoveToPage:(UIViewController *)controller index:(NSInteger)index {
    // 在选项卡切换之后执行的操作
    NSLog(@"已切换到选项卡 %ld", (long)index);
}

@end