效果图(真机效果好一点.毕竟 gif)
collectionViewChange.gif
切换 layout 方法
- (void)changeLayout{
_isSortByDay = !_isSortByDay;
if (firstLayout) {
[self.collectionView reloadData];
[self.collectionView setCollectionViewLayout:_threeLayout animated:YES];
}else{
[self.collectionView reloadData];
[self.collectionView setCollectionViewLayout:_fourLayout animated:YES];
}
}
layout
@interface 哼 ()
// 每行个数
@property (nonatomic,assign)NSInteger numberOfLine;
@property (nonatomic,assign)CGFloat margin;
@end
@implementation嗯哼
- (instancetype)initWithNumberOfLine:(NSInteger)num andAllMargin:(CGFloat)margin{
self = [super init];
if (self) {
self.numberOfLine = num;
self.margin = margin;
}
return self;
}
- (void)prepareLayout{
[super prepareLayout];
// num + 1 为间距
CGFloat wh = (self.collectionView.size.width - self.margin * (self.numberOfLine + 1)) / self.numberOfLine;
self.itemSize = CGSizeMake(wh, wh);
self.minimumInteritemSpacing = _margin;
self.minimumLineSpacing = _margin;
self.scrollDirection = UICollectionViewScrollDirectionVertical;
self.sectionInset = UIEdgeInsetsMake(0, _margin, 0, _margin);
self.collectionView.showsHorizontalScrollIndicator = NO;
self.collectionView.showsVerticalScrollIndicator = NO;
}
