ios - 如何为 Facebook Paper 应用程序的菜单按钮设置动画/变形

Question

我在 Facebook Paper 应用程序中看到了这个动画/变形，他们会将菜单按钮(当您下拉菜单时的按钮)变形为 X，然后在您点击它时返回。我记录了它，因为我不知道如何用其他方式显示它。

https://www.youtube.com/watch?v=y6j_mVgv-NM

谁能给我解释一下这是怎么做到的？我想要这个用于我的应用程序。

Answer 1

太棒了，以前没见过。

创建了一个执行此操作的快速要点:

https://gist.github.com/mnmaraes/9458421

编辑:所以它不仅仅是一个链接，关键概念是两个方法:

-(void)morphToX
{
    CGFloat angle = M_PI_4;
    CGPoint center = CGPointMake(120., 120.);

    __weak TUIViewController *weakSelf = self;
    [UIView animateWithDuration:0.8 delay:0.0 usingSpringWithDamping:0.6 initialSpringVelocity:2.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        TUIViewController *strongSelf = weakSelf;

        strongSelf.topLineView.transform = CGAffineTransformMakeRotation(-angle*5);
        strongSelf.topLineView.center = center;

        strongSelf.bottomLineView.transform = CGAffineTransformMakeRotation(angle*5);
        strongSelf.bottomLineView.center = center;

        strongSelf.centerLineView.transform = CGAffineTransformMakeScale(0., 1.0);

    } completion:^(BOOL finished) {

    }];
}

和:

-(void)morphToLine
{

    __weak TUIViewController *weakSelf = self;
    [UIView animateWithDuration:0.8 delay:0.0 usingSpringWithDamping:0.6 initialSpringVelocity:2.0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        TUIViewController *strongSelf = weakSelf;

        strongSelf.topLineView.transform = CGAffineTransformIdentity;
        strongSelf.topLineView.center = CGPointMake(120., 2.);

        strongSelf.bottomLineView.transform = CGAffineTransformIdentity;
        strongSelf.bottomLineView.center = CGPointMake(120., 238.);

        strongSelf.centerLineView.transform = CGAffineTransformIdentity;

    } completion:^(BOOL finished) {

    }];
}

第一个动画从平行线到 X，第二个动画从 X 到直线。玩转动画的数字和选项应该会给您带来不同的体验。

玩得开心!