给自定义tabBar的按钮添加点击放大缩小的动画

// 一句话,写在UITabBarController.m脚本中,tabBar是自动执行的方法


// 点击tabbarItem自动调用
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
    NSInteger index = [self.tabBar.items indexOfObject:item];

    [self animationWithIndex:index];

    if([item.title isEqualToString:@"发现"])
    {
      // 也可以判断标题,然后做自己想做的事
    }

}
- (void)animationWithIndex:(NSInteger) index {
    NSMutableArray * tabbarbuttonArray = [NSMutableArray array];
    for (UIView *tabBarButton in self.tabBar.subviews) {
        if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            [tabbarbuttonArray addObject:tabBarButton];
        }
    }
    CABasicAnimation*pulse = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    pulse.timingFunction= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    pulse.duration = 0.08;
    pulse.repeatCount= 1;
    pulse.autoreverses= YES;
    pulse.fromValue= [NSNumber numberWithFloat:0.7];
    pulse.toValue= [NSNumber numberWithFloat:1.3];
    [[tabbarbuttonArray[index] layer]
     addAnimation:pulse forKey:nil];
 
}