实现tabbar点击的帧动画效果, 可以用下面两种方法

Jietu20190722-103120-HD.gif

方法1:

1.在UITabBarController 里面

@interface UITabBarController () <UITabBarControllerDelegate>
//注意数组是UIImage.CGImage
@property (nonatomic ,strong)NSMutableArray * imagesArray;

@end

2

//UITabBarController
- (void)viewDidLoad {
    [super viewDidLoad];
    self.imagesArray = [NSMutableArray array];
    for (int i = 0; i<4; i++) {
        NSMutableArray *images = [NSMutableArray array];
        switch (i) {
            case 0:
                for (int j = 0; j<=10; j++) {
                    NSString *imageName = [NSString stringWithFormat:@"home.bundle/tabbar_home_sel_%d",j];
                    [images addObject:(__bridge UIImage *)[UIImage imageNamed:imageName].CGImage];
                }
                break;
            case 1:
                for (int j = 0; j<=10; j++) {
                    NSString *imageName = [NSString stringWithFormat:@"center.bundle/tabbar_senter_sel_%d",j];
                    [images addObject:(__bridge UIImage *)[UIImage imageNamed:imageName].CGImage];
                }
                break;
            case 2:
                for (int j = 0; j<=10; j++) {
                    NSString *imageName = [NSString stringWithFormat:@"class.bundle/tabbar_class_sel_%d",j];
                    [images addObject:(__bridge UIImage *)[UIImage imageNamed:imageName].CGImage];
                }
                break;
            case 3:
                for (int j = 0; j<=13; j++) {
                    NSString *imageName = [NSString stringWithFormat:@"me.bundle/tabbar_me_sel_%d",j];
                    [images addObject:(__bridge UIImage *)[UIImage imageNamed:imageName].CGImage];
                }
                break;
            default:
                break;
        }
        [self.imagesArray addObject:images];
        
    }

3.实现 UITabBarControllerDelegate 方法

• (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item;

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
   NSMutableArray *tabBarBtnArray = [NSMutableArray array];
   int index = [NSNumber numberWithUnsignedInteger:[tabBar.items indexOfObject:item]].intValue;
   // 获取UITabBarButton
   for (int i = 0 ;i < self.tabBar.subviews.count; i++ ) {
       UIView * tabBarButton = self.tabBar.subviews[i];
       if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
           [tabBarBtnArray addObject:tabBarButton];
           // NSLog(@"tabBarButton.sup=%@",[tabBarButton. class]);
       }
   }
   //获取当前的UITabBarButton
   UIView *TabBarButton = tabBarBtnArray[index];
   NSArray *images = self.imagesArray[index];
   for (UIView *imageV in TabBarButton.subviews) {
       if ([imageV isKindOfClass:NSClassFromString(@"UITabBarSwappableImageView")]) {
           CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
           //animation.delegate = self;
           animation.values = images;
           animation.duration = 0.3;// images.count * 0.08;
           animation.calculationMode = kCAAnimationCubic;
           [imageV.layer addAnimation:animation forKey:nil];  
       }
   }
  
   
}

方法2 , 和方法一区别不大, 只需修改下面代码

//注意数组是UIImage不是UIImage.CGImage
@property (nonatomic ,strong)NSMutableArray * imagesArray;

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    NSMutableArray *tabBarBtnArray = [NSMutableArray array];
    int index = [NSNumber numberWithUnsignedInteger:[tabBar.items indexOfObject:item]].intValue;
    // 获取UITabBarButton
    for (int i = 0 ;i < self.tabBar.subviews.count; i++ ) {
        UIView * tabBarButton = self.tabBar.subviews[i];
        if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            [tabBarBtnArray addObject:tabBarButton];
            // NSLog(@"tabBarButton.sup=%@",[tabBarButton. class]);
        }
    }
    //获取当前的UITabBarButton
    UIView *TabBarButton = tabBarBtnArray[index];
    NSArray *images = self.imagesArray[index];
    for (UIView *imageV in TabBarButton.subviews) {
        if ([imageV isKindOfClass:NSClassFromString(@"UITabBarSwappableImageView")]) {
           
             //图片是是要UIImage的
             UIImageView *imageView = (UIImageView*)imageV;
             imageView.animationImages = images;
             imageView.animationDuration = images.count * 0.08;
             imageView.animationRepeatCount = 1;
             [imageView startAnimating];
        }
    }
      
}

3.另外你可以设置tabbar的其他属性

//1设置线条颜色(遮挡法)
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, -0.5, SCREEN_WIDTH + 1, 0.5)];
    view.backgroundColor = RGBWithAlpha(0xe3e5e9, 1.0);
    [[UITabBar appearance] insertSubview:view atIndex:0];
//1.tabbar标题颜色
    NSDictionary *attributes_normol = @{NSFontAttributeName:[UIFont systemFontOfSize:11],NSForegroundColorAttributeName:RGBWithAlpha(0xADADAD, 1)};
    
    NSDictionary *attributes_sel = @{NSFontAttributeName:[UIFont systemFontOfSize:11],NSForegroundColorAttributeName:RGBWithAlpha(0xFF5847, 1)};
    
    for (UITabBarItem *item in self.tabBar.items) {
       // item.imageInsets = UIEdgeInsetsMake(-3, 0, 0, 0);
        //item.titlePositionAdjustment = UIOffsetMake(0, -4);
        [item setTitleTextAttributes:attributes_normol forState:UIControlStateNormal];
        [item setTitleTextAttributes:attributes_sel forState:UIControlStateSelected];
    }
//假如tabbar的图片大小不合适, 不想换图的话可以重新生成一张图片
- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize

{
    UIGraphicsBeginImageContextWithOptions(newSize, 0, [UIScreen mainScreen].scale);
    //UIGraphicsBeginImageContext(newSize);
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return  newImage;
}