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效果

TabbarItemLottie.gif

用cocoapods集成lottie-ios

pod 'lottie-ios'

UITabBar+Ex.h

#import <UIKit/UIKit.h>

@interface UITabBar (Ex)

- (void)addLottieImage:(int)index lottieName:(NSString *)lottieName;

- (void)animationLottieImage:(int)index;

@end

UITabBar+Ex.m

#import "UITabBar+Ex.h"
#import <lottie-ios/Lottie/Lottie.h>

#define LOTAnimationViewWidth 33
#define LOTAnimationViewHeight 33

@implementation UITabBar (Ex)

- (void)addLottieImage:(int)index lottieName:(NSString *)lottieName {
    if ([NSThread isMainThread]) {
        [self addLottieImageInMainThread:index lottieName:lottieName];
    } else {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self addLottieImageInMainThread:index lottieName:lottieName];
        });
    }
}

- (void)addLottieImageInMainThread:(int)index lottieName:(NSString *)lottieName {
    LOTAnimationView *lottieView = [LOTAnimationView animationNamed:lottieName];
    
    CGFloat totalW = [UIScreen mainScreen].bounds.size.width;
    CGFloat singleW = totalW / self.items.count;
    
    CGFloat x = ceilf(index * singleW + (singleW - LOTAnimationViewWidth) / 2.0);
    CGFloat y = 0;
    lottieView.frame = CGRectMake(x, y, LOTAnimationViewWidth, LOTAnimationViewHeight);
    lottieView.userInteractionEnabled = NO;
    lottieView.contentMode = UIViewContentModeScaleAspectFit;
    lottieView.tag = 888 + index;
    
    [self addSubview:lottieView];
}

- (void)animationLottieImage:(int)index {
    [self stopAnimationAllLottieView];
    
    LOTAnimationView *lottieView = [self viewWithTag:888 + index];
    
    if (lottieView && [lottieView isKindOfClass:[LOTAnimationView class]]) {
        lottieView.animationProgress = 0;
        [lottieView play];
    }
}

- (void)stopAnimationAllLottieView {
    for (int i = 0; i < self.items.count; i++) {
        LOTAnimationView *lottieView = [self viewWithTag:888 + i];
        
        if (lottieView && [lottieView isKindOfClass:[LOTAnimationView class]]) {
            [lottieView stop];
        }
    }
}

@end

Lottie官网
Lottie-iOS
LottieFiles资源文件
bodymovin - AE插件，可以将AE设计好的动画导出为json格式的文件
Lottie简介 & iOS集成使用