我在单元格 subview 上添加了运动效果。 第一次它工作正常。 但是当细胞被重复使用时。运动效果不起作用....
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
testcell *processingCell = (testcell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
UIInterpolatingMotionEffect *horizontalMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
horizontalMotionEffect.minimumRelativeValue = @(-kMotionEffectRelativeValue );
horizontalMotionEffect.maximumRelativeValue = @(kMotionEffectRelativeValue );
UIInterpolatingMotionEffect *verticalMotionEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
verticalMotionEffect.minimumRelativeValue = @(-kMotionEffectRelativeValue );
verticalMotionEffect.maximumRelativeValue = @(kMotionEffectRelativeValue );
group = [[UIMotionEffectGroup alloc] init];
group.motionEffects = @[horizontalMotionEffect,verticalMotionEffect];
});
if (!processingCell.coustomView) {
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
view.center = processingCell.contentView.center;
view.backgroundColor =[UIColor blackColor];
[processingCell addSubview:view];
processingCell.coustomView = view;
}
processingCell.coustomView.hidden = YES;
processingCell.coustomView.hidden = NO;
[processingCell.coustomView addMotionEffect:group];
return processingCell;
如果我想隐藏这个 subview 。展示之后。那么动效就没用了
processingCell.coustomView.hidden = YES;
processingCell.coustomView.hidden = NO;
我尝试使用这个调试 Action 效果。 subview 被暂停
po [UIView _motionEffectEngine]
最佳答案
我能够通过子类化 UICollectionViewCell 并在布局期间删除并重新应用运动效果来实现它。示例:
- (void) layoutSubviews{
[super layoutSubviews];
[self addMotionEffectToView:self.contentView];
}
- (void) addMotionEffectToView:(UIView*) view{
for (UIMotionEffect* effect in [view.motionEffects copy]){
[view removeMotionEffect:effect];
}
... add your motion effect
}
关于ios - UIMotionEffect 同时在 UICollectionViewCell 中不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22038302/