怎么在iOS中利用UICollectionView实现横向滑动
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UICollectionView的横向滚动
// // SCVisitorInputAccessoryView.m // 访客通行录入页面--访客姓名输入历史的InputAccessory #import "SCInputAccessoryView.h" #import "SCInputAccessoryCell.h" #define SCHorizontalMargin 15.0f #define SCVerticalMargin 10.0f @interface SCInputAccessoryView ()@property (weak, nonatomic) IBOutlet UICollectionView *collectionView; /// 名字记录的数组 @property (nonatomic, strong) NSMutableArray *nameArray; @end @implementation SCInputAccessoryView + (instancetype)loadNibView { return [[[NSBundle mainBundle] loadNibNamed:[SCInputAccessoryView className] owner:self options:nil] objectAtIndex:0]; } - (void)awakeFromNib { [super awakeFromNib]; self.clipsToBounds = YES; self.collectionView.delegate = self; self.collectionView.dataSource = self; [self setupView]; } - (void)setupView { /// 设置此属性为yes 不满一屏幕 也能滚动 self.collectionView.alwaysBounceHorizontal = YES; self.collectionView.showsHorizontalScrollIndicator = NO; // 1.创建流水布局 UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; layout.scrollDirection = UICollectionViewScrollDirectionHorizontal; self.collectionView.collectionViewLayout = layout; [self registerNibWithTableView]; } #pragma mark - 代理方法 Delegate Methods // 设置分区 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } // 每个分区上得元素个数 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return self.nameArray.count; } // 设置cell - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { SCInputAccessoryCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([SCInputAccessoryCell class]) forIndexPath:indexPath]; [cell refreshCellWithTitle:self.nameArray[indexPath.row]]; return cell; } // 设置cell大小 itemSize:可以给每一个cell指定不同的尺寸 - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { CGFloat height = 35.0f; CGFloat width = [self gainStringWidthWithString:self.nameArray[indexPath.row] font:15.0f height:height]; return CGSizeMake(width, height); } // 设置UIcollectionView整体的内边距(这样item不贴边显示) - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { // 上 左 下 右 return UIEdgeInsetsMake(SCVerticalMargin, SCHorizontalMargin, SCVerticalMargin, SCHorizontalMargin); } // 设置minimumLineSpacing:cell上下之间最小的距离 - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section { return SCHorizontalMargin; } // 设置minimumInteritemSpacing:cell左右之间最小的距离 - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section { return SCHorizontalMargin; } // 选中cell的回调 - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { if (self.selectRowBlock) { self.selectRowBlock(indexPath.row, self.nameArray[indexPath.row]); } } #pragma mark - 对外方法 Public Methods /// array数组里面放的元素 必须字符串类型的 - (void)refreshUIWithNameArray:(NSArray *)array { [self.nameArray removeAllObjects]; [self.nameArray addObjectsFromArray:array]; [self.collectionView reloadData]; } #pragma mark - 内部方法 Private Methods // 注册cell - (void)registerNibWithTableView { [self.collectionView registerNib:[UINib nibWithNibName:[SCInputAccessoryCell className] bundle:nil] forCellWithReuseIdentifier:NSStringFromClass([SCInputAccessoryCell class])]; } - (CGFloat)gainStringWidthWithString:(NSString *)string font:(CGFloat)font height:(CGFloat)height { if (string.length == 0) { return 0.0f; } CGSize maxSize = CGSizeMake(MAXFLOAT, height); CGSize realSize = [string boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:font]} context:nil].size; /// 左右各16 return (realSize.width + 2 * (SCHorizontalMargin + 1.f)); } #pragma mark - 点击/触碰事件 Action Methods #pragma mark - 懒加载 Lazy Load - (NSMutableArray *)nameArray { if (!_nameArray) { _nameArray = [NSMutableArray arrayWithCapacity:0]; } return _nameArray; } @end
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