Question

我有TabBar控制器，上面添加了3个ViewController。现在，当我们点击特定选项卡时，所有选项卡都正常切换。我想要，从左到右或从左到右滑动TabBar的功能相同。所以请给我一些建议。我怎么能这样做？

Answer 1

您可以将UISwipeGestureRecognizer添加到UITabBar

通过根据手势方向设置来处理滑动手势

- (void)viewDidLoad {
    [super viewDidLoad];
    UISwipeGestureRecognizer *leftToRightGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(leftToRightSwipeDidFire)];
    leftToRightGesture.direction = UISwipeGestureRecognizerDirectionRight;
    [self.tabBarController.tabBar addGestureRecognizer:leftToRightGesture];

    UISwipeGestureRecognizer *rightToLeftGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(rightToLeftSwipeDidFire)];
    rightToLeftGesture.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.tabBarController.tabBar addGestureRecognizer:rightToLeftGesture];
}


- (void)leftToRightSwipeDidFire {
    UITabBar *tabBar = self.tabBarController.tabBar;
    NSInteger index = [tabBar.items indexOfObject:tabBar.selectedItem];
    if (index > 0) {
        self.tabBarController.selectedIndex = index - 1;
    } else {
        return;
    }
}
- (void)rightToLeftSwipeDidFire {
    UITabBar *tabBar = self.tabBarController.tabBar;
    NSInteger index = [tabBar.items indexOfObject:tabBar.selectedItem];
    if (index < tabBar.items.count - 1) {
        self.tabBarController.selectedIndex = index + 1;
    } else {
        return;
    }
}

Answer 2

为每个视图控制器的视图添加2（一个用于左侧，另一个用于右侧）滑动手势并进行IBAction

- (IBAction)swipeRightAction:(UIGestureRecognizer *)sender {


    UISwipeGestureRecognizerDirection directions=[(UISwipeGestureRecognizer *)sender direction];
    switch (directions) {
        case UISwipeGestureRecognizerDirectionRight:
           indexNumberItem--;
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            indexNumberItem++;
            break;
        default:
            break;
    }


        if (indexNumberItem<3) {
            indexNumberItem=0;
        }
        if (indexNumberItem>=3) {
            indexNumberItem=2;
        }



    self.tabBarController.selectedViewController= [self.tabBarController.viewControllers objectAtIndex:indexNumberItem];


}

Answer 3

您的所有子ViewControllers都可以从一个为您完成所有繁重任务的类继承。

我就是这样做的

class SwipableTabVC : UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let left = UISwipeGestureRecognizer(target: self, action: #selector(swipeLeft))
        left.direction = .left
        self.view.addGestureRecognizer(left)

        let right = UISwipeGestureRecognizer(target: self, action: #selector(swipeRight))
        right.direction = .right
        self.view.addGestureRecognizer(right)
    }

    func swipeLeft() {
        let total = self.tabBarController!.viewControllers!.count - 1
        tabBarController!.selectedIndex = min(total, tabBarController!.selectedIndex + 1)

    }

    func swipeRight() {
        tabBarController!.selectedIndex = max(0, tabBarController!.selectedIndex - 1)
    }
}

现在，属于UITabBarController的所有viewcontroller都可以从SwipableTabVC而不是UIViewController继承。

在iOS中的TabBar控制器上滑动viewControllers

3 个答案: