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City Guides App.jpg
从dribbble的设计师的作品中了解到City Guides上非常优秀的动画效果。感叹设计师很棒的设计的同时，小编也在心里默想这些动画是怎么实现的。于是从App Store上下载了APP，使用然后仔细研究后便有了此篇文章。
City Guides中几乎所有的界面展示与交互方式都是有动画效果的。小编也就分几部分来实现动画效果。
这一篇要实现的动画效果如下：
第一个动画效果：
ZFCityGuides-One.gif
第二个动画效果：
ZFCityGuides-two.gif
本篇文章只讲解实现思路，具体的可以参见源码。
动画效果一
第一个动画效果，实际上包括三个部分动画效果。选中动画效果、动画转场和切换动画效果。本篇文章中所有的动画，使用POP和Core Animation实现。
选中动画效果
此动画实现相对简单一些，中间部分是使用的UICollectionView,创建了四个cell。在可视的cell中实现被选中的cell放大，其余可视的cell缩放的同时透明度减少。使用POP实现的方法如下：
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
UICollectionViewCell *selectedCell = (UICollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
for (UICollectionViewCell *cell in collectionView.visibleCells) {
if ([cell isEqual:selectedCell]) {
//选中的cell的放大
POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
scaleAnimation.duration = 0.5;
scaleAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(1.05, 1.05)];
[cell.layer pop_addAnimation:scaleAnimation forKey:@"scaleAnimation"];
POPBasicAnimation *alphaAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewAlpha];
alphaAnimation.duration = 0.5;
alphaAnimation.toValue = @1.0;
[cell pop_addAnimation:alphaAnimation forKey:nil];
[alphaAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
// if (finished) {
//
// ZFMainTabBarController *mainTabBarVC = [[ZFMainTabBarController alloc] init];
// mainTabBarVC.modalPresentationStyle = UIModalPresentationOverCurrentContext;
// mainTabBarVC.transitioningDelegate = self;
//
// self.interactionViewController = [ZFInteractiveTransition new];
// [self presentViewController:mainTabBarVC animated:YES completion:NULL];
// }
}];
}
else{
//未选中的可视cell的缩放
POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
scaleAnimation.duration = 0.5;
scaleAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(0.95, 0.95)];
[cell.layer pop_addAnimation:scaleAnimation forKey:@"scaleAnimation"];
POPBasicAnimation *alphaAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewAlpha];
alphaAnimation.duration = 0.5;
alphaAnimation.toValue = @0.7;
[cell pop_addAnimation:alphaAnimation forKey:nil];
}
}
}
此部分实现的效果图：
ZFCityGuides-1.gif
动画转场
此部分的转场过渡动画效果，参考小编上篇文章讲解的自定义转场。里面涉及到手势交互，下一篇文章再做详细讲解。
切换效果动画
实际上是点击最上面的两个button后，对应的视图动画效果。
切换到SLIDES后，UICollectionView整个视图向左移，移出当前屏幕。与此同时可视的UICollectionViewCell随着变化，而且每个cell的变化有区别。区别是：移出的时候，第二个cell最后消失在视线里（偏移量最小），第四个cell旋转幅度较大（角度最大）。
实现的方式：
-(void)showSlideLayout:(UIButton *)sender{
if (_SliderButton.selected) {
return;
}
[_scrollView setHidden:NO];
_SliderButton.selected = YES;
_GridButton.selected = NO;
_SliderButton.userInteractionEnabled = NO;
[self canEnableClick];
_backgroundLayer.frame = sender.frame;
int i = 0;
for (UICollectionViewCell *cell in _cityCollectView.visibleCells) {
NSArray *translationArray = @[@-300, @-200, @-600, @-600];
NSArray *angles = @[@(-15* M_PI/180), @(-30* M_PI/180), @(-15* M_PI/180), @(-60* M_PI/180)];
NSArray *scaleArray = @[@0, @0, @0, @-5];
//未选中的可视cell的缩放
POPBasicAnimation *rotationAnimation = [POPBasicAnimation easeInEaseOutAnimation];
rotationAnimation.property = [POPAnimatableProperty propertyWithName:kPOPLayerRotation];
rotationAnimation.duration = duration;
rotationAnimation.fromValue = @(0);
rotationAnimation.toValue = angles[i];
POPBasicAnimation *translationAnimation = [POPBasicAnimation easeInEaseOutAnimation];
translationAnimation.property = [POPAnimatableProperty propertyWithName:kPOPLayerTranslationX];
translationAnimation.duration = duration;
translationAnimation.fromValue = @(0);
translationAnimation.toValue = translationArray[i];
POPBasicAnimation *zPositionAnimation = [POPBasicAnimation easeInEaseOutAnimation];
zPositionAnimation.property = [POPAnimatableProperty propertyWithName:kPOPLayerZPosition];
zPositionAnimation.duration = duration;
zPositionAnimation.toValue = scaleArray[i];
[cell.layer pop_addAnimation:rotationAnimation forKey:@"rotationAnimation"];
[cell.layer pop_addAnimation:translationAnimation forKey:@"translationAnimation"];
[cell.layer pop_addAnimation:zPositionAnimation forKey:@"zPositionAnimation"];
i++;
}
// collectionView 移动
CGRect fromFrame = _cityCollectView.frame;
CGRect toFrome = fromFrame;
fromFrame.origin.x -= fromFrame.size.width;
_cityCollectView.frame = fromFrame;
POPBasicAnimation *frameAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewFrame];
frameAnimation.name = @"showSliderView";
frameAnimation.duration = duration;
frameAnimation.fromValue = [NSValue valueWithCGRect:toFrome];
frameAnimation.toValue = [NSValue valueWithCGRect:fromFrame];
frameAnimation.delegate = self;
[_cityCollectView pop_addAnimation:frameAnimation forKey:@"frameAnimation"];
[frameAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
if (finished) {
[_cityCollectView setHidden:YES];
}
}];
}
切换到GRID后，UICollectionView整个视图向右移，渐入到当前屏幕。UICollectionViewCell变化与上面有些不一样。第3个cell 和第4个cell最后完成动画，其动画变化较大。
-(void)showGridLayout:(UIButton *)sender{
if (_GridButton.selected) {
return;
}
[_cityCollectView setHidden:NO];
_backgroundLayer.frame = sender.frame;
_SliderButton.selected = NO;
_GridButton.selected = YES;
_GridButton.userInteractionEnabled = NO;
[self canEnableClick];
int i = 0;
for (UICollectionViewCell *cell in _cityCollectView.visibleCells) {
NSArray *translationArray = @[@-5, @0, @-300, @-100];
NSArray *angles = @[@(-2* M_PI/180), @(-5* M_PI/180), @(-30* M_PI/180), @(-10* M_PI/180)];
//未选中的可视cell的缩放
POPBasicAnimation *rotationAnimation = [POPBasicAnimation easeInEaseOutAnimation];
rotationAnimation.property = [POPAnimatableProperty propertyWithName:kPOPLayerRotation];
rotationAnimation.duration = duration;
rotationAnimation.fromValue = angles[i];
rotationAnimation.toValue = @(0);
POPBasicAnimation *translationAnimation = [POPBasicAnimation easeInEaseOutAnimation];
translationAnimation.property = [POPAnimatableProperty propertyWithName:kPOPLayerTranslationX];
translationAnimation.duration = duration;
translationAnimation.fromValue = translationArray[i];
translationAnimation.toValue = @(0);
[cell.layer pop_addAnimation:rotationAnimation forKey:@"rotationAnimation"];
[cell.layer pop_addAnimation:translationAnimation forKey:@"translationAnimation"];
i++;
}
// collectionView 移动
CGRect fromFrame = _cityCollectView.frame;
CGRect toFrome = fromFrame;
toFrome.origin.x = 0;
POPBasicAnimation *frameAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewFrame];
frameAnimation.name = @"showGridView";
frameAnimation.duration = duration;
frameAnimation.fromValue = [NSValue valueWithCGRect:fromFrame];
frameAnimation.toValue = [NSValue valueWithCGRect:toFrome];
frameAnimation.delegate = self;
[_cityCollectView pop_addAnimation:frameAnimation forKey:@"frameAnimation"];
[frameAnimation setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
if (finished) {
[_scrollView setHidden:YES];
}
}];
}
以上两个动画完成的过程中，仔细观察SLIDES下对应的视图，UIScrollView有一些细微的变化。在Y方向上有一定的偏移量的变化。是根据UICollectionView移出的位置变化而改变。使用POPAnimationDelegate的方法，根据当前执行动画决定在Y方向偏移量是逐步增加或减少。
- (void)pop_animationDidApply:(POPAnimation *)anim
{
// NSLog(@"%@",anim.name );
CGRect currentValue = [[anim valueForKey:@"currentValue"] CGRectValue];
if ([anim.name isEqualToString:@"showSliderView"]) {
CGRect frame = _scrollView.frame;
CGFloat distanceY = 30 *(1 -fabs(currentValue.origin.x /_scrollView.frame.size.width));
frame.origin.x = _scrollView.frame.size.width + currentValue.origin.x;
frame.origin.y = CGRectGetMaxY(_SliderButton.frame) + 20. + distanceY ;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.0];
_scrollView.frame = frame;
[UIView commitAnimations];
}
else if([anim.name isEqualToString:@"showGridView"]){
CGRect frame = _scrollView.frame;
CGFloat distanceY = 30 * (1 - fabs(currentValue.origin.x /_scrollView.frame.size.width));
frame.origin.x = _scrollView.frame.size.width + currentValue.origin.x;
frame.origin.y = CGRectGetMaxY(_SliderButton.frame) + 20. + distanceY ;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.0];
_scrollView.frame = frame;
[UIView commitAnimations];
}
}
具体效果参见下图：
ZFCityGuides-2.gif
动画效果二
此部分动画是使用UIScrollView来实现，同样可以使用UICollectionView来实现。此处是UICollectionView实现。本篇文章使用继承UIScrollView的类来实现。只需要以下几行代码即可。是根据UIScrollView的子视图偏移量的变化实现。参考以下代码
#import "ZFTransformScrollView.h"
@implementation ZFTransformScrollView
-(void)layoutSubviews{
[super layoutSubviews];
CGFloat contentOffsetX = self.contentOffset.x;
for(UIView *view in self.subviews){
CATransform3D t1 = CATransform3DIdentity;
view.layer.transform = t1;
//计算每个cell的偏移量
CGFloat distanceFromCenterX = view.frame.origin.x - contentOffsetX;
CGFloat offsetRatio = distanceFromCenterX / CGRectGetWidth(self.frame);
CGFloat angle = offsetRatio * 30;
//前半部分
if (offsetRatio < 0) {
//offsetRation 为负
//沿y轴向右转 沿着y的正方向看是逆时针
CATransform3D t2 = CATransform3DMakeRotation(DEGREES_TO_RADIANS(-angle), 0, 1,0 );
//沿x轴向里转 沿着x的正方向看是逆时针
CATransform3D t3 = CATransform3DRotate(t2, DEGREES_TO_RADIANS(-5 * offsetRatio) , 1, 0, 0);
//沿y轴向下移动 距离正
CATransform3D t4 = CATransform3DTranslate(t3, 0, -35 *offsetRatio, 0);
//实现透视投影 默认是正交投影 以CGPointMake(0, 0)为观察点 3D效果更明显
view.layer.transform = CATransform3DPerspect(t4, CGPointMake(0, 0), 500);
}
else{
//给个起始位置 在正常位置以下以左的某段距离
t1 = CATransform3DMakeTranslation(60 * offsetRatio * 1.5, 100 * offsetRatio * 1.5, 0);
//沿y轴向左转 沿着y的正方向看是顺时针
CATransform3D t2 = CATransform3DRotate(t1,DEGREES_TO_RADIANS(-angle), 0, 1,0 );
//沿x轴向里转 沿着x的正方向看是逆时针
CATransform3D t3 = CATransform3DRotate(t2, DEGREES_TO_RADIANS(5 * offsetRatio), 1, 0, 0);
//沿y轴向上移动 距离正
CATransform3D t4 = CATransform3DTranslate(t3, 0, -35 *offsetRatio, 0);
//实现透视投影 默认是正交投影 以CGPointMake(0, 0)为观察点 3D效果更明显
view.layer.transform = CATransform3DPerspect(t4, CGPointMake(0, 0), 500);
}
}
}
@end
其中CATransform3DPerspect实现方法和使用原理可以参考此篇文章iOS 3D UI---CALayer的transform扩展
CATransform3D CATransform3DMakePerspective(CGPoint center, float disZ)
{
CATransform3D transToCenter = CATransform3DMakeTranslation(-center.x, -center.y, 0);
CATransform3D transBack = CATransform3DMakeTranslation(center.x, center.y, 0);
CATransform3D scale = CATransform3DIdentity;
scale.m34 = -1.0f/disZ;
return CATransform3DConcat(CATransform3DConcat(transToCenter, scale), transBack);
}
CATransform3D CATransform3DPerspect(CATransform3D t, CGPoint center, float disZ)
{
return CATransform3DConcat(t, CATransform3DMakePerspective(center, disZ));
}
后续实现内容，请持续关注小编。
ZFCityGuides3.gif
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