我正在閱讀Apples guidelines上animating changes in a collection view,試圖模仿照片的應用程序。選擇圖像時,圖像會從collectionview中的區域「增長」爲全尺寸視圖。UICollectionViewTransitionLayout - 模仿iOS7照片collectionview佈局
蘋果筆記使用UICollectionViewLayout
對象,但對我來說,它看起來非常混亂,並且全尺寸庫中的最終圖像不可見,因爲動畫是以collectionview爲中心的。
我的代碼如下
-(void)setHorizontalLayout:(BOOL)layout
{
if (layout == YES)
{
UICollectionViewTransitionLayout *layout =[self.collectionView startInteractiveTransitionToCollectionViewLayout:[self getHorizontalPagingLayout] completion:^(BOOL completed, BOOL finish) {
[self.collectionView setPagingEnabled:YES];
}];
[self.collectionView.collectionViewLayout invalidateLayout];
layout.transitionProgress = 0.1;
double delayInSeconds = 0.1;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[self updateLayout:layout];
//[self.collectionView.collectionViewLayout invalidateLayout];
//[self.collectionView finishInteractiveTransition];
});
[self.collectionView.collectionViewLayout invalidateLayout];
return;
}
}
-(void)updateLayout:(UICollectionViewTransitionLayout *)layout
{
if (layout.transitionProgress >= 1.0)
{
[self.collectionView finishInteractiveTransition];
return;
}
double delayInSeconds = 0.05;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
layout.transitionProgress += 0.005;
[self.collectionView.collectionViewLayout invalidateLayout];
[self updateLayout:layout];
});
}