UICollectionView和NSTimer无法在Xcode的Objective-C中制作幻灯片图像

Question

嗨，我将NS参数传递给scrollToItemAtIndexPath时，NSTimer遇到了问题，该参数始终已终止。 有谁可以帮忙吗？

SlideCollectionViewCell *cell = [collectionImageSlideView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];

cell.showImage.image = [UIImage imageNamed:[images objectAtIndex:indexPath.row]];
NSInteger rowIndex = indexPath.row;
NSInteger imageCount = self->images.count-1;
if(rowIndex<imageCount){
    rowIndex = rowIndex+1;

}else{
    rowIndex = 0;
}
scrollingTimer = [NSTimer scheduledTimerWithTimeInterval: 5.0
                target: self
                selector:@selector(startTimer:)
                userInfo: @(rowIndex) repeats:YES];
return cell;

Answer 1

这是因为您要在NSIndexpath变量中传递NSInteger，您需要制作一个NSIndexpath，然后将其传递给类似以下的函数：-

cell.showImage.image = [UIImage imageNamed:[images objectAtIndex:indexPath.row]];
NSInteger rowIndex = indexPath.row;
NSInteger imageCount = self->images.count-1;
if(rowIndex<imageCount){
    rowIndex = rowIndex+1;

}else{
    rowIndex = 0;
}
NSIndexPath *indexToPass=[NSIndexPath indexPathForRow:rowIndex inSection:indexPath.section];
scrollingTimer = [NSTimer scheduledTimerWithTimeInterval: 5.0
            target: self
            selector:@selector(startTimer:)
            userInfo:indexToPass repeats:YES];
return cell;