给tabBarItem加点击效果动画

获取到tabBarItem，添加喜欢的动画

.h文件

@interface JGTabBarController ()

//记录上一次点击tabbar
@property (nonatomic, assign) NSInteger indexFlag;

@end

.m文件

①先放大，再缩小；②Z轴旋转 ；③向上移动；④放大并保持

@implementation JGTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.indexFlag = ;

}

#pragma mark - UITabBarDelegate

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
    /** 给 tabBarButton 加动画 */
    NSInteger index = [self.tabBar.items indexOfObject:item];
    if (index != self.indexFlag) {
        //执行动画
        NSMutableArray *arry = [NSMutableArray array];
        for (UIView *btn in self.tabBar.subviews) {
            if ([btn isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
                [arry addObject:btn];
            }
        }
        //添加动画
        [self addUpTranslationAnimtaionWithArr:arry index:index];

        self.indexFlag = index;
    }
}

#pragma mark - More Animation

/// 先放大，再缩小
- (void)addScaleAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //放大效果，并回到原位
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    //速度控制函数，控制动画运行的节奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //执行时间
    animation.repeatCount = ;      //执行次数
    animation.autoreverses = YES;    //完成动画后会回到执行动画之前的状态
    animation.fromValue = [NSNumber numberWithFloat:0.7];   //初始伸缩倍数
    animation.toValue = [NSNumber numberWithFloat:1.3];     //结束伸缩倍数
    [[arry[index] layer] addAnimation:animation forKey:nil];
}

/// Z轴旋转
- (void)addRotationAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //z轴旋转180度
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    //速度控制函数，控制动画运行的节奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //执行时间
    animation.repeatCount = ;      //执行次数
    animation.removedOnCompletion = YES;
    animation.fromValue = [NSNumber numberWithFloat:];   //初始伸缩倍数
    animation.toValue = [NSNumber numberWithFloat:M_PI];     //结束伸缩倍数
    [[arry[index] layer] addAnimation:animation forKey:nil];
}

/// 向上移动
- (void)addUpTranslationAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //向上移动
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
    //速度控制函数，控制动画运行的节奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //执行时间
    animation.repeatCount = ;      //执行次数
    animation.removedOnCompletion = YES;
    animation.fromValue = [NSNumber numberWithFloat:];   //初始伸缩倍数
    animation.toValue = [NSNumber numberWithFloat:-];     //结束伸缩倍数
    [[arry[index] layer] addAnimation:animation forKey:nil];
}

/// 放大并保持
- (void)addscaleAndKeepAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //放大效果
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    //速度控制函数，控制动画运行的节奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //执行时间
    animation.repeatCount = ;      //执行次数
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeForwards;           //保证动画效果延续
    animation.fromValue = [NSNumber numberWithFloat:1.0];   //初始伸缩倍数
    animation.toValue = [NSNumber numberWithFloat:1.15];     //结束伸缩倍数
    [[arry[index] layer] addAnimation:animation forKey:nil];
    //移除其他tabbar的动画
    for (int i = ; i<arry.count; i++) {
        if (i != index) {
            [[arry[i] layer] removeAllAnimations];
        }
    }
}

@end

UITabbarItem自定义  先放大再复原

//添加动画
- (void)cusTabbarItemAddAnimationWithBtn:(UIButton *)btn {

    CABasicAnimation*pulse = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    pulse.timingFunction= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration = 0.2;
    pulse.repeatCount= ;
    pulse.autoreverses= YES;
    pulse.fromValue= [NSNumber numberWithFloat:0.7];
    pulse.toValue= [NSNumber numberWithFloat:1.3];
    [btn.layer addAnimation:pulse forKey:nil];
}