獲取到tabBarItem，添加喜歡的動畫

.h文件

@interface JGTabBarController ()

//記錄上一次點擊tabbar
@property (nonatomic, assign) NSInteger indexFlag;

@end

.m文件

①先放大，再縮小；②Z軸旋轉 ；③向上移動；④放大並保持

@implementation JGTabBarController


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

    
    self.indexFlag = 0;
    
}


#pragma mark - UITabBarDelegate

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

#pragma mark - More Animation

/// 先放大，再縮小
- (void)addScaleAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //放大效果，並回到原位
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    //速度控制函數，控制動畫運行的節奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //執行時間
    animation.repeatCount = 1;      //執行次數
    animation.autoreverses = YES;    //完成動畫後會回到執行動畫之前的狀態
    animation.fromValue = [NSNumber numberWithFloat:0.7];   //初始伸縮倍數
    animation.toValue = [NSNumber numberWithFloat:1.3];     //結束伸縮倍數
    [[arry[index] layer] addAnimation:animation forKey:nil];
}

/// Z軸旋轉
- (void)addRotationAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //z軸旋轉180度
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    //速度控制函數，控制動畫運行的節奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //執行時間
    animation.repeatCount = 1;      //執行次數
    animation.removedOnCompletion = YES;
    animation.fromValue = [NSNumber numberWithFloat:0];   //初始伸縮倍數
    animation.toValue = [NSNumber numberWithFloat:M_PI];     //結束伸縮倍數
    [[arry[index] layer] addAnimation:animation forKey:nil];
}

/// 向上移動
- (void)addUpTranslationAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //向上移動
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.translation.y"];
    //速度控制函數，控制動畫運行的節奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //執行時間
    animation.repeatCount = 1;      //執行次數
    animation.removedOnCompletion = YES;
    animation.fromValue = [NSNumber numberWithFloat:0];   //初始伸縮倍數
    animation.toValue = [NSNumber numberWithFloat:-10];     //結束伸縮倍數
    [[arry[index] layer] addAnimation:animation forKey:nil];
}


/// 放大並保持
- (void)addscaleAndKeepAnimtaionWithArr:(NSMutableArray *)arry index:(NSInteger)index
{
    //放大效果
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    //速度控制函數，控制動畫運行的節奏
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animation.duration = 0.2;       //執行時間
    animation.repeatCount = 1;      //執行次數
    animation.removedOnCompletion = NO;
    animation.fillMode = kCAFillModeForwards;           //保證動畫效果延續
    animation.fromValue = [NSNumber numberWithFloat:1.0];   //初始伸縮倍數
    animation.toValue = [NSNumber numberWithFloat:1.15];     //結束伸縮倍數
    [[arry[index] layer] addAnimation:animation forKey:nil];
    //移除其他tabbar的動畫
    for (int i = 0; i<arry.count; i++) {
        if (i != index) {
            [[arry[i] layer] removeAllAnimations];
        }
    }
}

@end

UITabbarItem自定義 先放大再復原

//添加動畫
- (void)cusTabbarItemAddAnimationWithBtn:(UIButton *)btn {
    
    CABasicAnimation*pulse = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    pulse.timingFunction= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration = 0.2;
    pulse.repeatCount= 1;
    pulse.autoreverses= YES;
    pulse.fromValue= [NSNumber numberWithFloat:0.7];
    pulse.toValue= [NSNumber numberWithFloat:1.3];
    [btn.layer addAnimation:pulse forKey:nil];
}

給tabBarItem加點擊效果動畫