以编程方式更改TabBatController.selectedIndex时的视图转换 [英] View transitions when TabBatController.selectedIndex changed programmatically

问题描述

当我以编程方式更改 UITabBarController.selectedIndex 时，我很难使视图过渡动画化。

当我点击 TabBar 图标时，动画效果很好，但是当我更改 selectedIndex 来自 gestureRecognizer 动作。

TabBar控制器类的转换代码

  func tabBarController（_ tabBarController：UITabBarController，shouldSelect viewController：UIViewController）->布尔{
，如果CanChangeTab {
保护let fromView = tabBarController.selectedViewController！.view，让toView = viewController.view else {
返回false //确保您将此设置为false 
} 
 
 if fromView！= toView {
 if（tabBarController.prevIndex> tabBarController.selectedIndex）{
 UIView.transition（from：fromView，to：toView，持续时间： 0.3，选项：[。transitionFlipFromLeft]，完成：无）
}否则{
 UIView.transition（from：fromView，to：toView，duration：0.3，选项：[.transitionFlipFromRight]，完成：nil ）
} 
} 
返回true 
}否则{
 return false 
} 
} 
  

手势识别器正在调用以下函数，而上面的代码未被调用：

  @objc func swiped（_手势：UISwipeGestureRecognizer）{ 
 if（CanChangeTab）{
 self.tabBarController？.prevIndex =（self.tabBarController？.selectedIndex）！ 
 if pose.direction == .left {
 if（self.tabBarController？.selectedIndex）！ < 4 {//在此处设置总计选项卡
 self.tabBarController？.selectedIndex + = 1 
} 
}否则if pose.direction == .right {
 if（self。 tabBarController？.selectedIndex）！ > 0 {
 self.tabBarController？.selectedIndex-= 1 
} 
} 
} 
} 
  

我也看不到应该调用或重写什么来获得手势基动画的动画。

解决方案

好。我使用 ViewController幻灯片动画

找到了解决方案如马特所建议。

因此，使用扩展名+扩展名中的animateToTab函数并更改我的滑动方法，即可按预期工作。

  @objc func swiped（_手势：UISwipeGestureRecognizer）{
 if（CanChangeTab）{
让thisTabController = self.tabBarController为！ iBayTabController 
 
 thisTabController.prevIndex =（thisTabController.selectedIndex）如果手势方向==则为
。left {
 if thisTabController.selectedIndex< 4 {//在此处设置总计选项卡
 thisTabController.animateToTab（toIndex：thisTabController.selectedIndex + 1）
} 
}否则if pose.direction == .right {
 if （self.tabBarController？.selectedIndex）！ > 0 {
 thisTabController.animateToTab（toIndex：thisTabController.selectedIndex-1）
} 
} 
} 
} 
  

I have some troubles to get the views transitions animated when I change the UITabBarController.selectedIndex changed programmatically.

When I tap on a TabBar icon the animation works fine, but when I change the selectedIndex from a gestureRecognizer action.

The transition code at the TabBar controller class is the following:

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
    if CanChangeTab {
        guard let fromView = tabBarController.selectedViewController!.view, let toView = viewController.view else {
            return false // Make sure you want this as false
        }

        if fromView != toView {
            if (tabBarController.prevIndex > tabBarController.selectedIndex) {
                UIView.transition(from: fromView, to: toView, duration: 0.3, options: [.transitionFlipFromLeft], completion: nil)
            } else {
                UIView.transition(from: fromView, to: toView, duration: 0.3, options: [.transitionFlipFromRight], completion: nil)
            }
        }
        return true
    } else {
        return false
    }
}

The gesture recogniser is calling the following function, from which the above code is not called:

@objc func swiped(_ gesture: UISwipeGestureRecognizer) {
    if (CanChangeTab) {
        self.tabBarController?.prevIndex = (self.tabBarController?.selectedIndex)!
        if gesture.direction == .left {
            if (self.tabBarController?.selectedIndex)! < 4 { // set your total tabs here
                self.tabBarController?.selectedIndex += 1
            }
        } else if gesture.direction == .right {
            if (self.tabBarController?.selectedIndex)! > 0 {
                self.tabBarController?.selectedIndex -= 1
            }
        }
    }
}

I cannot see what should be called or overridden to get the animations for the gesture base change too.

解决方案

Ok. I have found the solution, using ViewController slide animation

as Matt proposed.

So using the extension + the animateToTab function in the extension and changing my swipe method it works just as expected.

   @objc func swiped(_ gesture: UISwipeGestureRecognizer) {
    if (CanChangeTab) {
        let thisTabController = self.tabBarController as! iBayTabController

        thisTabController.prevIndex = (thisTabController.selectedIndex)
        if gesture.direction == .left {
            if thisTabController.selectedIndex < 4 { // set your total tabs here
                thisTabController.animateToTab(toIndex: thisTabController.selectedIndex+1)
            }
        } else if gesture.direction == .right {
            if (self.tabBarController?.selectedIndex)! > 0 {
                thisTabController.animateToTab(toIndex: thisTabController.selectedIndex-1)
            }
        }
    }
}

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