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這期內容當中小編將會給大家帶來有關怎么在iOS中利用UICollectionView實現橫向滑動,文章內容豐富且以專業的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
UICollectionView的橫向滾動
// // SCVisitorInputAccessoryView.m // 訪客通行錄入頁面--訪客姓名輸入歷史的InputAccessory #import "SCInputAccessoryView.h" #import "SCInputAccessoryCell.h" #define SCHorizontalMargin 15.0f #define SCVerticalMargin 10.0f @interface SCInputAccessoryView () <UICollectionViewDelegate, UICollectionViewDataSource,UICollectionViewDelegateFlowLayout> @property (weak, nonatomic) IBOutlet UICollectionView *collectionView; /// 名字記錄的數組 @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 { /// 設置此屬性為yes 不滿一屏幕 也能滾動 self.collectionView.alwaysBounceHorizontal = YES; self.collectionView.showsHorizontalScrollIndicator = NO; // 1.創建流水布局 UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; layout.scrollDirection = UICollectionViewScrollDirectionHorizontal; self.collectionView.collectionViewLayout = layout; [self registerNibWithTableView]; } #pragma mark - 代理方法 Delegate Methods // 設置分區 - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } // 每個分區上得元素個數 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return self.nameArray.count; } // 設置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; } // 設置cell大小 itemSize:可以給每一個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); } // 設置UIcollectionView整體的內邊距(這樣item不貼邊顯示) - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { // 上 左 下 右 return UIEdgeInsetsMake(SCVerticalMargin, SCHorizontalMargin, SCVerticalMargin, SCHorizontalMargin); } // 設置minimumLineSpacing:cell上下之間最小的距離 - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section { return SCHorizontalMargin; } // 設置minimumInteritemSpacing:cell左右之間最小的距離 - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section { return SCHorizontalMargin; } // 選中cell的回調 - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { if (self.selectRowBlock) { self.selectRowBlock(indexPath.row, self.nameArray[indexPath.row]); } } #pragma mark - 對外方法 Public Methods /// array數組里面放的元素 必須字符串類型的 - (void)refreshUIWithNameArray:(NSArray<NSString *> *)array { [self.nameArray removeAllObjects]; [self.nameArray addObjectsFromArray:array]; [self.collectionView reloadData]; } #pragma mark - 內部方法 Private Methods // 注冊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 - 點擊/觸碰事件 Action Methods #pragma mark - 懶加載 Lazy Load - (NSMutableArray *)nameArray { if (!_nameArray) { _nameArray = [NSMutableArray arrayWithCapacity:0]; } return _nameArray; } @end
上述就是小編為大家分享的怎么在iOS中利用UICollectionView實現橫向滑動了,如果剛好有類似的疑惑,不妨參照上述分析進行理解。如果想知道更多相關知識,歡迎關注億速云行業資訊頻道。
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