动画按钮

主要是一个继承于UIButton的类，封装了动画效果。
使用如下：

-(void)uiCofig
{
    self.title=@"AnimationButton";


    [self.navigationController.navigationBar setBarTintColor:[UIColor lightGrayColor]];

    _leftBtn=[TBAnimationButton buttonWithType:UIButtonTypeCustom];
    _leftBtn.frame=CGRectMake(0, 0, 20, 20);
    _leftBtn.currentState=TBAnimationButtonStateMinus;
    [_leftBtn addTarget:self action:@selector(leftItemAction) forControlEvents:UIControlEventTouchUpInside];

    self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc] initWithCustomView:_leftBtn];

    _rightBtn=[TBAnimationButton buttonWithType:UIButtonTypeCustom];
    _rightBtn.frame=CGRectMake(0, 0, 15, 25);
    _rightBtn.currentState=TBAnimationButtonStateMenu;
    _rightBtn.lineColor=[UIColor orangeColor];
    [_rightBtn addTarget:self action:@selector(rightItemAction) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc] initWithCustomView:_rightBtn];

}


-(void)leftItemAction
{
    if (_leftBtn.currentState==TBAnimationButtonStateMinus) {
        _leftBtn.currentState=TBAnimationButtonStatePlus;
    }else{
        _leftBtn.currentState=TBAnimationButtonStateMinus;
    }
}

-(void)rightItemAction
{
    if (_rightBtn.currentState==TBAnimationButtonStateMenu) {
        _rightBtn.currentState=TBAnimationButtonStateArrow;
    }else{
        _rightBtn.currentState=TBAnimationButtonStateMenu;
    }
}

gitHub的地址如下: https://github.com/AlexeyBelezeko/TBIconTransitionKit