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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