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+//
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+// NewPhotoPreviewController.m
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+// RA Image
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+//
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+// Created by Jack on 2017/6/14.
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+// Copyright © 2017年 USAI. All rights reserved.
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+//
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+
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+#import "RAPhotoPreviewController.h"
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+#import "PhotoPreviewCell.h"
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+
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+@interface RAPhotoPreviewController ()<UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
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+
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+@property (nonatomic,assign) NSUInteger currentIndex;
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+@property (strong, nonatomic) IBOutlet UILabel *indicator;
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+@property (strong, nonatomic) IBOutlet UICollectionView *previewContainer;
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+
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+
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+@property (nonatomic,strong) NSArray<id<RAPhotoItemDelegate>> *photos;
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+@property (nonatomic,assign) NSUInteger offset;
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+
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+@property (nonatomic,assign) BOOL hideNavigationBar;
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+
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+@end
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+
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+@implementation RAPhotoPreviewController
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+
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++ (instancetype)ra_photoPreviewControllerWithPhotoItems:(NSArray<id<RAPhotoItemDelegate>> *)items offset:(NSUInteger)offset {
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+
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+ RAPhotoPreviewController *vc = [[UIStoryboard storyboardWithName:@"PhotoList" bundle:nil] instantiateViewControllerWithIdentifier:@"RAPhotoPreviewController"];
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+ if (offset == 0 || offset >= items.count) {
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+ vc.photos = items;
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+ } else {
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+ NSMutableArray<id<RAPhotoItemDelegate>> *tmpArr = [NSMutableArray array];
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+ [tmpArr addObjectsFromArray:[items subarrayWithRange:NSMakeRange(offset, items.count - offset)]];
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+ for (int i = 0; i < offset; i++) {
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+ id<RAPhotoItemDelegate> model = [items objectAtIndex:i];
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+ [tmpArr addObject:model];
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+ }
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+ items = [tmpArr copy];
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+ vc.photos = items;
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+ }
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+ vc.offset = 0;
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+
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+ return vc;
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+}
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+
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+- (void)viewDidLoad {
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+ [super viewDidLoad];
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+
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+ if (@available(iOS 11, *)) {
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+ self.previewContainer.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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+ } else {
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+ self.automaticallyAdjustsScrollViewInsets = NO;
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+ }
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+
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+ self.indicator.layer.cornerRadius = 20;
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+ self.indicator.layer.masksToBounds = YES;
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+
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+ self.previewContainer.pagingEnabled = YES;
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+ NSString *offset = [NSString stringWithFormat:@"%lu / %lu",(unsigned long)self.currentIndex + 1,(unsigned long)self.photos.count];
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+ self.indicator.text = offset;
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+
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+ self.hideNavigationBar = self.navigationController.isNavigationBarHidden;
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+
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+ self.navigationController.navigationBarHidden = YES;
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+}
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+
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+- (void)viewWillAppear:(BOOL)animated {
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+ [super viewWillAppear:animated];
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+}
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+
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+- (void)viewDidLayoutSubviews {
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+ [super viewDidLayoutSubviews];
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+
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+ [self.previewContainer setContentOffset:CGPointMake((self.currentIndex + 1) * CGRectGetWidth(self.previewContainer.frame), 0) animated:NO];
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+
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+}
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+
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+- (void)viewDidAppear:(BOOL)animated {
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+ [super viewDidAppear:animated];
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+}
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+
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+- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
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+
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+ // 重新布局 Item 大小
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+ [self.previewContainer.collectionViewLayout invalidateLayout];
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+}
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+
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+- (BOOL)prefersStatusBarHidden {
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+ return YES;
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+}
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+
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+- (void)didReceiveMemoryWarning {
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+ [super didReceiveMemoryWarning];
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+ // Dispose of any resources that can be recreated.
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+}
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+
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+#pragma mark - Setter
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+
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+- (void)setOffset:(NSUInteger)offset {
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+ [self setCurrentIndex:offset];
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+}
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+
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+#pragma mark - FlowLayout Delegate
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+
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+- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
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+ return collectionView.bounds.size;
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+}
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+
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+- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
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+ return 0;
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+}
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+
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+- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
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+ return 0;
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+}
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+
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+- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
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+ return UIEdgeInsetsZero;
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+}
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+
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+#pragma mark - CollectionView Delegate
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+
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+- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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+
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+ NSUInteger idx = [self contentOffsetForIndexPath:indexPath];
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+
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+ PhotoPreviewCell *preCell = (PhotoPreviewCell *)cell;
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+
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+ id<RAPhotoItemDelegate> model = [self.photos objectAtIndex:idx];
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+ preCell.model = model;
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+}
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+
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+#pragma mark - CollectionView DataSource
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+
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+- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
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+ if ([self.photos count] == 0) {
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+ return 0;
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+ }
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+ return self.photos.count + 2;
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+}
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+
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+- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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+
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+ PhotoPreviewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"PhotoPreviewCell" forIndexPath:indexPath];
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+ cell.scrollView.delegate = self;
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+ return cell;
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+}
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+
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+#pragma mark - ScrollView Delegate
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+
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+- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
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+ CGFloat offsetX = scrollView.contentOffset.x;
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+ float idxf = offsetX / CGRectGetWidth(scrollView.frame);
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+ int idxi = (int)(offsetX / CGRectGetWidth(scrollView.frame));
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+
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+ if (idxf == idxi) {
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+ if (idxi == 0) {
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+ self.currentIndex = self.photos.count - 1;
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+ } else if (idxi == self.photos.count + 1) {
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+ self.currentIndex = 0;
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+ } else {
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+ self.currentIndex = idxi - 1;
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+ }
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+
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+ [self updateIndicator];
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+ } else {
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+
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+ }
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+
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+ if (idxi == 0) {
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+ [self scrollToIndex:self.photos.count];
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+ }
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+
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+ if (idxi == self.photos.count + 1) {
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+ [self scrollToIndex:1];
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+ }
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+
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+}
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+
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+- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
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+ if (scrollView != self.previewContainer) {
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+ return scrollView.subviews.firstObject;
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+ }
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+ return nil;
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+}
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+
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+- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
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+
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+ if (self.previewContainer != scrollView) {
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+
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+ }
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+}
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+
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+#pragma mark - Private
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+
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+- (void)updateIndicator {
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+ NSString *offset = [NSString stringWithFormat:@"%lu / %lu",(unsigned long)self.currentIndex + 1,(unsigned long)self.photos.count];
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+ self.indicator.text = offset;
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+}
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+
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+- (NSUInteger)contentOffsetForIndexPath:(NSIndexPath *)indexPath {
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+ NSUInteger idx = indexPath.row;
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+ if (idx == 0) {
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+ idx = self.photos.count - 1;
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+ }else if (idx == self.photos.count + 1) {
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+ idx = 0;
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+ } else {
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+ idx = idx - 1;
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+ }
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+ return idx;
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+}
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+
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+- (void)scrollToIndex:(NSUInteger)index { // 不会出现肉眼可见的滚动效果
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+ self.previewContainer.contentOffset = CGPointMake(index * CGRectGetWidth(self.previewContainer.frame), 0);
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+}
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+
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+- (IBAction)closeBtnClick:(UIButton *)sender {
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+
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+ if (self.navigationController) {
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+ self.navigationController.navigationBarHidden = self.hideNavigationBar;
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+ [self.navigationController popViewControllerAnimated:YES];
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+ } else {
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+ [self dismissViewControllerAnimated:YES completion:nil];
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+ }
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+
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+}
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+
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+
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+@end
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Pen Li
