点赞动画-张秀清

int i;

-(UIButton *)praiseBtn
{
    if (!_praiseBtn)
    {
        _praiseBtn = [UIButton buttonWithType:UIButtonTypeCustom];

        [_praiseBtn setBackgroundImage:[UIImage imageNamed:@"未选点赞"] forState:UIControlStateNormal];
        [_praiseBtn setBackgroundImage:[UIImage imageNamed:@"已选点赞"] forState:UIControlStateSelected];

        [_praiseBtn addTarget:self action:@selector(praiseAction:) forControlEvents:UIControlEventTouchUpInside];
    }
    return _praiseBtn;
}

#pragma mark - 点赞按钮事件
-(void)praiseAction:(UIButton *)sender
{
    if (sender.selected)
    {
        [Dialog toastCenter:@"您已经赞过"];
        return;
    }
    else
    {
        sender.selected = YES;
        //点赞动画
        CAKeyframeAnimation *k = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];
        k.values = @[@(0.1),@(1.0),@(1.5)];
        k.keyTimes = @[@(0.0),@(0.5),@(0.8),@(1.0)];
        k.calculationMode = kCAAnimationLinear;

        i++;
        [sender.layer addAnimation:k forKey:@"SHOW"];
    }
}