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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 "NewPhotoPreviewController.h"
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+#import "PhotoPreviewCell.h"
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+
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+@interface NewPhotoPreviewController ()<UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
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+
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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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+@end
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+
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+@implementation NewPhotoPreviewController
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+
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+- (void)viewDidLoad {
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+ [super viewDidLoad];
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+ // Do any additional setup after loading the view.
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+// self.automaticallyAdjustsScrollViewInsets = NO;
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+// self.navigationController.navigationBar.translucent = NO;
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+// self.edgesForExtendedLayout = UIRectEdgeNone;
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+
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+ UIView *v = [UIView new];
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+ [self.view insertSubview:v atIndex:0];
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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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+
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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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+// UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)self.previewContainer.collectionViewLayout;
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+// CGFloat w = CGRectGetWidth(self.view.frame);
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+// CGFloat h = CGRectGetHeight(self.view.frame);
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+// layout.itemSize = CGSizeMake(w,h);
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+// layout.minimumLineSpacing = 0;
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+// layout.minimumInteritemSpacing = 0;
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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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+ [self.previewContainer reloadData]; // 重新布局Item大小才正确
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+
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+}
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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)setCurrentIndex:(NSUInteger)currentIndex {
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+ _currentIndex = currentIndex;
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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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+#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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+- (void)collectionviewdidend
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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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+ PhotoPreviewCell *preCell = (PhotoPreviewCell *)cell;
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+
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+ self.currentIndex = indexPath.row;
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+
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+ UIScrollView *sc = preCell.scrollView;
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+ sc.delegate = self;
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+ sc.maximumZoomScale = 5;
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+ sc.showsVerticalScrollIndicator = NO;
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+ sc.showsHorizontalScrollIndicator = NO;
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+ NSDictionary *item = [self.photos objectAtIndex:indexPath.row];
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+ UIImage *img = [UIImage imageWithContentsOfFile:[item objectForKey:@"path"]];
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+
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+ CGFloat width = CGRectGetWidth(cell.bounds);
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+ CGFloat height = CGRectGetHeight(cell.bounds);
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+ CGFloat w = img.size.width;
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+ CGFloat h = img.size.height;
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+ // 根据图片大小和ScrollView大小等比缩放，使ScrollView容得下图片
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+ float factor = MAX(w / width, h / height);
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+ factor = 1 / factor * 0.8;
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+
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+ CGRect frame = CGRectMake((width - w * factor) * 0.5, (height - h * factor) * 0.5, w * factor, h * factor);
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+ UIImageView *iv = [[UIImageView alloc] initWithImage:img];
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+ iv.frame = frame;
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+ iv.userInteractionEnabled = YES;
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+ for (UIView *v in sc.subviews) {
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+ [v removeFromSuperview];
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+ }
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+ [sc addSubview:iv];
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+ sc.contentSize = CGSizeZero;
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+ sc.contentOffset = CGPointZero;
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+}
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+
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+- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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+ PhotoPreviewCell *preCell = (PhotoPreviewCell *)cell;
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+ UIScrollView *sc = preCell.scrollView;
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+ for (UIView *v in sc.subviews) {
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+ [v removeFromSuperview];
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+ }
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+ sc.zoomScale = 1;
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+ sc.contentSize = CGSizeZero;
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+ sc.contentOffset = CGPointZero;
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+}
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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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+ return self.photos.count;
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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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+
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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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+- (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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+ if (self.previewContainer != scrollView) {
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+ CGFloat width = CGRectGetWidth(self.previewContainer.bounds);
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+ CGFloat height = CGRectGetHeight(self.previewContainer.bounds);
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+
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+ CGSize itemSize = [self itemSize:self.currentIndex];
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+ CGSize contentSize = scrollView.contentSize;
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+ contentSize.width += (width - itemSize.width);
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+ contentSize.height += (height - itemSize.height);
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+ scrollView.contentSize = contentSize;
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+ }
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+}
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+
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+- (CGSize)itemSize:(NSUInteger)index {
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+
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+ CGFloat width = CGRectGetWidth(self.previewContainer.bounds);
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+ CGFloat height = CGRectGetHeight(self.previewContainer.bounds);
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+ CGSize size = CGSizeMake(width, height);
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+
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+ NSDictionary *item = [self.photos objectAtIndex:index];
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+ UIImage *img = [UIImage imageWithContentsOfFile:[item objectForKey:@"path"]];
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+ CGFloat w = img.size.width;
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+ CGFloat h = img.size.height;
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+ // 根据图片大小和ScrollView大小等比缩放，使ScrollView容得下图片
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+ float factor = MAX(w / width, h / height);
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+ factor = 1 / factor * 0.8;
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+
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+ size = CGSizeMake(w * factor, h * factor);
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+ return size;
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+}
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+
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+
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+@end
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Pen Li