作者:金婉jessica氵_573 | 来源:互联网 | 2023-01-16 10:00
这篇文章主要为大家展示了“iOS9中collectionView新特性怎么用”,内容简而易懂,条理清晰,希望能够帮助大家解决疑惑,下面让小编带领大家一起研究并学习一下“iOS9中collectionView新特性怎么用”这篇文章吧。
具体用法:
1.创建collectionView并设置代理
- (UICollectionView *)collectionView{
if (_collectionView == nil) {
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
layout.itemSize = CGSizeMake(50, 50);
_collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 20, self.view.bounds.size.width, self.view.bounds.size.height) collectionViewLayout:layout];
layout.minimumLineSpacing = 10;
layout.minimumInteritemSpacing = 10;
[_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];
_collectionView.backgroundColor = [UIColor cyanColor];
_collectionView.dataSource = self;
//此处给其增加长按手势,用此手势触发cell移动效果
UILongPressGestureRecognizer *longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handlelongGesture:)];
[_collectionView addGestureRecognizer:longGesture];
}
return _collectionView;
}
2.设置其资源
_dataSource = [NSMutableArray array];
for (int i = 1; i <= 50; i++) {
NSString *imageName = [NSString stringWithFormat:@"%d",i];
[_dataSource addObject:imageName];
}
3.监听手势,并设置其允许移动cell和交换资源
- (void)handlelongGesture:(UILongPressGestureRecognizer *)longGesture {
//判断手势状态
switch (longGesture.state) {
case UIGestureRecognizerStateBegan:{
//判断手势落点位置是否在路径上
NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:[longGesture locationInView:self.collectionView]];
if (indexPath == nil) {
break;
}
//在路径上则开始移动该路径上的cell
[self.collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];
}
break;
case UIGestureRecognizerStateChanged:
//移动过程当中随时更新cell位置
[self.collectionView updateInteractiveMovementTargetPosition:[longGesture locationInView:self.collectionView]];
break;
case UIGestureRecognizerStateEnded:
//移动结束后关闭cell移动
[self.collectionView endInteractiveMovement];
break;
default:
[self.collectionView cancelInteractiveMovement];
break;
}
}
- (BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath{
//返回YES允许其item移动
return YES;
}
- (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath*)destinationIndexPath {
//取出源item数据
id objc = [_dataSource objectAtIndex:sourceIndexPath.item];
//从资源数组中移除该数据
[_dataSource removeObject:objc];
//将数据插入到资源数组中的目标位置上
[_dataSource insertObject:objc atIndex:destinationIndexPath.item];
}
通过以上设置便可以成功移动cell了,下面奉上效果图
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