我感到惊讶的是,解决办法多么容易!

在您的申请代表级别上添加方法(或管理您的UITab Bar的任何其他类别),其中包括以下例行做法:

1. Create an UIImageView that will be used for animation.
2. Add it to your TabBar view using the addSubview: method.
3. Frame it down to the size of UITabBarItem (use UITabBar frame size and the number of tab bar items to calculate the frame size).
4. Adjust the imageView s frame.origin.x value to place the Image right above the tab bat item you want to animate.
5. Add animation you want to the imageView (you can play with opacity, swap several images - anything you want).

简便,不认为如此?

您可以把这一方法引向UIApplicationDelegate,在你们需要将刺酒物品与.合在一起的地方。

同样重要的是要注意到,你能够利用THROUGH的形象。 选择刺铁矿产品的观点是,对刺.没有图像。 如果你知道,可以就你可以做些什么做许多有意义的结论。

我找到了解决这一问题的更好办法。 添加习俗形象观点并不是一种更好的办法,因为在SOS 10.0和以后在改变icon 框架和计划方向方面,案文立场发生了变化。 你只是需要确定UITab BarController &的类别;制定以下法典。

override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {

    let index = self.tabBar.items?.index(of: item)
    let subView = tabBar.subviews[index!+1].subviews.first as! UIImageView
    self.performSpringAnimation(imgView: subView)
}

//func to perform spring animation on imageview
func performSpringAnimation(imgView: UIImageView) {

    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: .curveEaseInOut, animations: {

        imgView.transform = CGAffineTransform.init(scaleX: 1.4, y: 1.4)

        //reducing the size
        UIView.animate(withDuration: 0.5, delay: 0.2, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: .curveEaseInOut, animations: {
            imgView.transform = CGAffineTransform.init(scaleX: 1, y: 1)
        }) { (flag) in
        }
    }) { (flag) in

    }
}  

考虑到UITabBar的次表顺序可能不定,因此,如果使用索引从中获取正确的项目,则可能无法正确使用。 查阅这一员额:

我发现的解决办法是首先过滤和分类看法,然后利用表BW系统的正确指数查阅。

func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {

    let orderedTabBarItemViews: [UIView] = {
        let interactionViews = tabBar.subviews.filter({ $0 is UIControl })
        return interactionViews.sorted(by: { $0.frame.minX < $1.frame.minX })
    }()

    guard
        let index = tabBar.items?.firstIndex(of: item),
        let subview = orderedTabBarItemViews[index].subviews.first
    else {
        return
    }

    performSpringAnimation(for: subview)
}

func performSpringAnimation(for view: UIView) {
    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: .curveEaseInOut, animations: {
        view.transform = CGAffineTransform(scaleX: 1.25, y: 1.25)
        UIView.animate(withDuration: 0.5, delay: 0.2, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: .curveEaseInOut, animations: {
            view.transform = CGAffineTransform(scaleX: 1, y: 1)
        }, completion: nil)
    }, completion: nil)
}

实际比较容易:

Index of UIImageView in subviews 不能保证为ist。

在相关次表中,UIImage语的指数没有保证为 fist。

因此,通过班级更好地加以利用,并检查出价指数。

override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
    guard let idx = tabBar.items?.firstIndex(of: item),
        tabBar.subviews.count > idx + 1,
        let imageView = tabBar.subviews[idx + 1].subviews.compactMap({ $0 as? UIImageView }).first else {
        return
    }
    
    imageView.layer.add(bounceAnimation, forKey: nil)
}

这是使用<条码>CAKeyframeAnimation的图像:

private var bounceAnimation: CAKeyframeAnimation = {
    let bounceAnimation = CAKeyframeAnimation(keyPath: "transform.scale")
    bounceAnimation.values = [1.0, 1.3, 0.9, 1.0]
    bounceAnimation.duration = TimeInterval(0.3)
    bounceAnimation.calculationMode = CAAnimationCalculationMode.cubic
    return bounceAnimation
}()

https://i.imgur.com/RP0FY1z.gif” alt=“My Caption”/>

简明扼要地处理客观c中的禁忌项目

在贵禁区控制员班级

    - (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
    {
        UIVisualEffectView *viv = tabBar.subviews[item.tag].subviews.firstObject;
        UIImageView *img = viv.contentView.subviews.firstObject;
       // If UIImageView not get use this code
       // UIImageView *img  = tabBar.subviews[item.tag].subviews.lastObject;


        [self shakeAnimation:img];
      //[self bounceAnimation:img];

    }



- (void)shakeAnimation:(UIImageView *)img
{
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
    [animation setDuration:0.05];
    [animation setRepeatCount:2];
    [animation setAutoreverses:YES];
    [animation setFromValue:[NSValue valueWithCGPoint: CGPointMake([img center].x - 10.0f, [img center].y)]];
    [animation setToValue:[NSValue valueWithCGPoint: CGPointMake([img center].x + 10.0f, [img center].y)]];
    [[img layer] addAnimation:animation forKey:@"position"];
}


- (void)bounceAnimation:(UIImageView *)img
{
    img.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.001, 0.001);

    [UIView animateWithDuration:0.3/1.5 animations:^{
        img.transform = CGAffineTransformScale(CGAffineTransformIdentity, 1.1, 1.1);
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:0.3/2 animations:^{
            img.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.9, 0.9);
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:0.3/2 animations:^{
                img.transform = CGAffineTransformIdentity;
            }];
        }];
    }];
}

我没有这样做了,但我只是想建造一个加固剂,例如用一种加固剂,并将它添加到你想要毁灭的UITab BarItem。

For details about how to set up a CABasicAnimation see the Core Animation Programming Guide: http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreAnimation_guide/Articles/AnimatingLayers.html#//apple_ref/doc/uid/TP40006085-SW1