iphone - 类似于在 ios7 中打开应用程序的动画

Question

我想在 iOS7 中创建一个类似于在 iPhone 中打开的应用程序的动画。在此动画中，它仅显示应用程序从哪个点打开并在同一点关闭。

谁能帮帮我吗？

Answer 1

@property (weak, nonatomic) IBOutlet UIImageView *bg;
@property (weak, nonatomic) IBOutlet UIImageView *cal;
…

bool nowZoomed = NO;
CGRect iconPosition = {16,113,60,60}; // customize icon position

- (CGRect)zoomedRect // just a helper function, to get the new background screen size
{
    float screenWidth = UIScreen.mainScreen.bounds.size.width;
    float screenHeight = UIScreen.mainScreen.bounds.size.height;

    float size = screenWidth / iconPosition.size.width;
    float x = screenWidth/2 - (CGRectGetMidX(iconPosition) * size);
    float y = screenHeight/2 - (CGRectGetMidY(iconPosition) * size);

    return CGRectMake(x, y, screenWidth * size, screenHeight * size);
}

- (IBAction)test
{
    float animationDuration = 0.3f; //default
    if (nowZoomed) // zoom OUT
    {
        [UIView animateWithDuration:animationDuration animations:^{ // animate to original frame
            _cal.frame = iconPosition;
            _bg.frame = UIScreen.mainScreen.bounds;
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:animationDuration/2.0f animations:^{ // then fade out
                _cal.alpha = 0.0f;
            } completion:^(BOOL finished) {
                _cal.hidden = YES;
            }];
        }];
    }
    else // zoom IN
    {
        _cal.alpha = 0.0f;
        _cal.hidden = NO;
        [UIView animateWithDuration:animationDuration/2.0f animations:^{ // fade in faster
            _cal.alpha = 1.0f;
        }];
        [UIView animateWithDuration:animationDuration animations:^{ // while expanding view
            _cal.frame = UIScreen.mainScreen.bounds;
            _bg.frame = [self zoomedRect];
        }];
    }
    nowZoomed = !nowZoomed;
}

您可以通过创建如下示例项目来测试它：

• 像我一样从模拟器制作两个屏幕截图（主屏幕和日历视图）或抓住这两个：主屏幕/日历
• 在情节提要中添加 2 个图像视图和 1 个按钮
• 使背景图像视图与整个屏幕一样大
• 以及具有此尺寸的另一个图像视图：{16,113,60,60}
• 为两者创建一个IBOutlet（前两行代码）
• 将按钮操作目标设置为-(void)test

故事板图片（左）和动画过渡（右）

Answer 2

我个人更喜欢在这种情况下使用CGAffineTransformMakeScale()和设置。-[CALayer affineTransform]

affineTransform 非常易于使用，并从 Core Animation 中获得了一些不错的、隐含的好处。例如，隐式地为您处理更改框架的原点，并在需要时很容易重置回初始大小 - 您从一开始就不会丢失它！

[UIView animateWithDuration:0.3 animations:^{
    view.layer.affineTransform = CGAffineTransformMakeScale(10.0, 10.0); // To make a view larger:
    otherView.layer.affineTransform = CGAffineTransformMakeScale(0.0, 0.0); // to make a view smaller
}];

和

// To reset views back to their initial size after changing their sizes:
[UIView animateWithDuration:0.3 animations:^{
    view.layer.affineTransform = CGAffineTransformIdentity;
    otherView.layer.affineTransform = CGAffineTransformIdentity;
}];

Answer 3

据我所知，该动画是使用屏幕截图制作的。它更新视图的框架，同时从应用程序徽标平滑过渡到应用程序的屏幕截图。我从设备右下角模拟了打开iPod（音乐）应用到屏幕大小：

UIView * v = [[UIView alloc]init];
CGSize size = self.view.bounds.size;
CGRect frameInitial = CGRectMake(size.width - 30, size.height - 30, 20, 20);
CGRect frameFinal = CGRectMake(0,0, size.width, size.height);
[v setFrame:frameInitial];

然后，当您要为帧大小设置动画时，请使用以下行：

[UIView animateWithDuration:0.3f
                      delay:0.0f
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{

    [v setFrame:frameFinal];

} completion:nil];

编辑：没有意识到缩放还包括背景。下面的代码未经测试（我不在工作），所以预计会有一些缺陷和错别字。

想象一下，您在视图控制器的视图上有两层。直接在vc上有你要打开的应用程序，我们称之为finalView。在顶层有一个包含所有应用程序的窗口，它将缩放和淡入您的应用程序，这是它后面的一个视图。让我们称之为firstView。

初始条件：firstView 有一个 320 x 480 的框架（它是一个包含所有应用程序图标的窗口）。它的 alpha 为 1。finalView 具有相同的帧和 alpha，但它落后于 firstView。最终条件：finalView 仍将具有相同的帧和 alpha。但是 firstView 会放大到右下角（会有一个巨大的框架）并淡出（alpha -> 0）。

//初始条件：（或者更好的是使用IB）

CGRect frameInitial = CGRectMake(0,0, self.view.size.width, self.view.size;
CGRect frameFinal = CGRectMake(self.view.size.width * -4 ,self.view.size.height * -5, self.view.size.width * -5,self.view.size.width * -6);
[v setFrame:frameInitial];

然后，当您要为帧大小设置动画时，请使用以下行：

[UIView animateWithDuration:0.3f
                      delay:0.0f
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{

                                 [v setFrame:frameFinal];

                              } completion:nil];

Answer 4

我有一个使用 aUICollectionViewFloatLayout创建缩放效果的小型仓库，https://github.com/MichaelQuan/ios7ZoomEffect。它仍在进行中，但基本想法已经存在

布局代码为：

@interface ExpandingCollectionViewLayout ()

@property (nonatomic, assign) CGRect selectedCellFrame;
@property (nonatomic, strong) NSIndexPath *selectedIndexPath;

@end

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
    NSArray *layoutAttributes = [super layoutAttributesForElementsInRect:rect];

    [layoutAttributes enumerateObjectsUsingBlock:^(UICollectionViewLayoutAttributes *obj, NSUInteger idx, BOOL *stop) {
        [self _transformLayoutAttributes:obj];
    }];

    return layoutAttributes;
}

- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewLayoutAttributes *layoutAttributes = [super layoutAttributesForItemAtIndexPath:indexPath];

    [self _transformLayoutAttributes:layoutAttributes];

    return layoutAttributes;
}

- (void)_transformLayoutAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes
{
    if (self.selectedIndexPath != nil)
    {
        if ([layoutAttributes.indexPath isEqual:self.selectedIndexPath]) {
            // set the frame to be the bounds of the collectionView to expand to the entire collectionView
            layoutAttributes.frame = self.collectionView.bounds;
        } else {
            //scale = collectionView.size / cell_selected.size
            //translate = (scale - 1)(cell_i.center - cell_selected.center) + (collectionView.center - cell_selected.center)

            CGRect collectionViewBounds = self.collectionView.bounds;

            CGRect selectedFrame = self.selectedCellFrame;
            CGRect notSelectedFrame = layoutAttributes.frame;

            // Calculate the scale transform based on the ratio between the selected cell's frame and the collection views bound
            // Scale on that because we want everything to look scaled by the same amount, and the scale is dependent on how much the selected cell has to expand
            CGFloat x_scale = collectionViewBounds.size.width / selectedFrame.size.width;
            CGFloat y_scale = collectionViewBounds.size.height / selectedFrame.size.height;
            CGAffineTransform scaleTransform = CGAffineTransformMakeScale(x_scale, y_scale);

            // Translation based on how much the selected cell has been scaled
            // translate based on the (scale - 1) and delta between the centers
            CGFloat x_zoomTranslate = (x_scale - 1) * (CGRectGetMidX(notSelectedFrame) - CGRectGetMidX(selectedFrame));
            CGFloat y_zoomTranslate = (y_scale - 1) * (CGRectGetMidY(notSelectedFrame) - CGRectGetMidY(selectedFrame));
            CGAffineTransform zoomTranslate = CGAffineTransformMakeTranslation(x_zoomTranslate, y_zoomTranslate); //Translation based on how much the cells are scaled

            // Translation based on where the selected cells center is
            // since we move the center of the selected cell when expanded to full screen, all other cells must move by that amount as well
            CGFloat x_offsetTranslate = CGRectGetMidX(collectionViewBounds) - CGRectGetMidX(selectedFrame);
            CGFloat y_offsetTranslate = CGRectGetMidY(collectionViewBounds) - CGRectGetMidY(selectedFrame);
            CGAffineTransform offsetTranslate = CGAffineTransformMakeTranslation(x_offsetTranslate, y_offsetTranslate);

            // multiply translations first
            CGAffineTransform transform = CGAffineTransformConcat(zoomTranslate, offsetTranslate);
            transform = CGAffineTransformConcat(scaleTransform, transform);

            layoutAttributes.transform = transform;
        }

    }
}

要使用此布局代码展开单元格，请将selectedCellFrame和设置为要展开的单元格并在集合视图上selectedIndexPath调用。performBatchUpdates:completion:折叠集合selectedCellFrame = CGRectNull和selectedIndexPath = nil调用performBatchUpdates:completion: