无法通过 UICollectionView 和 NSTimer 在 Xcode 的objective-c 中制作幻灯片图像

Question

嗨，当我将参数传递给scrollToItemAtIndexPath 时，我遇到了 NSTimer 的问题，它总是被终止。有人可以帮忙吗？

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

这是因为您在 NSIndexpath 变量中传递了一个 NSInteger，您需要创建一个 NSIndexpath，然后将其传递给如下函数：-

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;