https://github.com/550872569/PictureChoice.git
代码可直接复制使用;
示意图:
iOS-OC图片选择器.gif
AppDelegate
#import "AppDelegate.h"
#import "YHPPictureChoiceController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
self.window.rootViewController = [[YHPPictureChoiceController alloc]init];
[self.window makeKeyAndVisible];
return YES;
}
@end
YHPPictrueChoicesFlowLayout
#import "YHPPictrueChoicesFlowLayout.h"
@implementation YHPPictrueChoicesFlowLayout
/** 在 collectionView 第一次布局的时候调用，此时 collectionView 的 frame 已经设置完毕 */
- (void)prepareLayout {
// 一定 super
[super prepareLayout];
/** item大小 */
CGFloat H = (kSCREEN_WIDTH - 2*10 - 3*10) / 4;
CGFloat W = H;
self.itemSize = CGSizeMake(W, H);
/** 列间距 */
self.minimumInteritemSpacing = 10;
/** 行间距 */
self.minimumLineSpacing = 10;
/** 滚动方向 */
self.scrollDirection = UICollectionViewScrollDirectionVertical;
/** 弹簧效果 */
self.collectionView.bounces = NO;
/** 分页 */
self.collectionView.pagingEnabled = YES;
/** 水平滚动指示条 */
self.collectionView.showsHorizontalScrollIndicator = NO;
/** 垂直滚动指示条 */
self.collectionView.showsVerticalScrollIndicator = NO;
}
@end
YHPPictureChoiceCell
#import <UIKit/UIKit.h>
/** 代理 */
@class YHPPictureChoiceCell;
/** 代理协议 */
@protocol YHPPictureChoiceCellDelegate <NSObject>
/** 代理方法 */
- (void)addPicture:(YHPPictureChoiceCell *)cell;
- (void)removePicture:(YHPPictureChoiceCell *)cell;
@end
@interface YHPPictureChoiceCell : UICollectionViewCell
/** 添加图片按钮 */
@property (nonatomic, strong) UIButton *addBtn;
/** 删除图片按钮 */
@property (nonatomic, strong) UIButton *removeBtn;
/** 图片 */
@property (nonatomic, strong) UIImage *picture;
@property (nonatomic, strong) NSIndexPath * indexpath;
/** 代理属性 */
@property (nonatomic, assign) id <YHPPictureChoiceCellDelegate> delegate;
@end
#import "YHPPictureChoiceCell.h"
@interface YHPPictureChoiceCell ()
@end
@implementation YHPPictureChoiceCell
- (void)setPicture:(UIImage *)picture {
_picture = picture;
}
#pragma mark - 懒加载属性
/** 添加图片按钮 */
-(UIButton *)addBtn {
if (!_addBtn) {
_addBtn = [[UIButton alloc]init];
[self addSubview:_addBtn];
_addBtn.frame = self.bounds;
}
return _addBtn;
}
/** 删除图片按钮 */
-(UIButton *)removeBtn {
if (!_removeBtn) {
_removeBtn = [[UIButton alloc]init];
[self addSubview:_removeBtn];
_removeBtn.frame = CGRectMake(self.bounds.size.width*0.75, 0, self.bounds.size.width * 0.25, self.bounds.size.width * 0.25);
[_removeBtn setImage:[UIImage imageNamed:@"compose_photo_close"] forState:UIControlStateNormal];
}
return _removeBtn;
}
/** collectionViewCell 的 frame 是根据之前的 layout 已经确定好的！*/
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
/** 添加子控件 */
[self setupUI];
}
return self;
}
/** 添加子控件 */
- (void)setupUI {
/** 添加图片按钮 */
[self.addBtn addTarget:self action:@selector(add) forControlEvents:UIControlEventTouchUpInside];
/** 删除图片按钮 */
[self.removeBtn addTarget:self action:@selector(remove) forControlEvents:UIControlEventTouchUpInside];
}
/** 添加图片按钮 */
- (void)add {
if ([self.delegate respondsToSelector:@selector(addPicture:)]) {
[self.delegate addPicture:self];
}
}
/** 删除图片按钮 */
- (void)remove {
if ([self.delegate respondsToSelector:@selector(removePicture:)]) {
[self.delegate removePicture:self];
}
}
YHPPictureChoiceController
#import "YHPPictureChoiceController.h"
#import "YHPPictrueChoicesFlowLayout.h"
#import "YHPPictureChoiceCell.h"
#import "UIImage+Extension.h"
#import <MobileCoreServices/MobileCoreServices.h>
/** 决定选择多少张图片 */
#define kArrayPictureMaxCount 4
/** 遵守代理协议 */
@interface YHPPictureChoiceController ()<YHPPictureChoiceCellDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>
/** 自定义流布局 */
@property (nonatomic, strong) YHPPictrueChoicesFlowLayout *layout;
/** picture数组 */
@property (nonatomic, strong) NSMutableArray *arrayPicture;
/** 已选照片索引 */
@property (nonatomic) NSInteger selectedIndex;
@end
@implementation YHPPictureChoiceController
/** 注册cell重用标识 */
static NSString * YHPPICTURECHOICECELL = @"YHPPictureChoiceCell";
/** picture数组 */
-(NSMutableArray *)arrayPicture {
if (!_arrayPicture) {
_arrayPicture = [[NSMutableArray alloc]init];
// [_arrayPicture addObject:[UIImage imageNamed:@"compose_pic_add"]];
}
return _arrayPicture;
}
/** 懒加载layout */
-(YHPPictrueChoicesFlowLayout *)layout {
if(_layout == nil) {
_layout = [[YHPPictrueChoicesFlowLayout alloc]init];
}
return _layout;
}
/** 重写init方法 */
- (instancetype)init
{
self = [super initWithCollectionViewLayout:self.layout];
if (self) {
}
return self;
}
/** viewDidLoad */
- (void)viewDidLoad {
[super viewDidLoad];
self.collectionView.backgroundColor = [UIColor whiteColor];
/** 注册cell */
[self.collectionView registerClass:[YHPPictureChoiceCell class] forCellWithReuseIdentifier:YHPPICTURECHOICECELL];
}
#pragma mark - 数据源方法
/** 组数 */
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
/** 每组多少个Item */
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
/** 决定选择多少张图片 */
if (self.arrayPicture.count >= kArrayPictureMaxCount) {
return kArrayPictureMaxCount;
}
return self.arrayPicture.count + (self.arrayPicture.count == kArrayPictureMaxCount ? 0 : 1);
}
/** 返回某组某个cell */
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
YHPPictureChoiceCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:YHPPICTURECHOICECELL forIndexPath:indexPath];
cell.selected = NO;
/** 设置代理 */
cell.delegate = self;
/** 根据indexpath.item来判断 */
if (indexPath.item == 0) {
/** cell.addBtn设置图片为固定加号图片 removeBtn隐藏 */
[cell.addBtn setImage:[UIImage imageNamed:@"compose_pic_add"] forState:UIControlStateNormal];
cell.removeBtn.hidden = YES;
[cell.addBtn setBackgroundColor:[UIColor redColor]];
// cell.addBtn.userInteractionEnabled = YES;
} else {
if (self.arrayPicture.count > 0) {
/** 如果不让removeBtn显示 由于cell 复用问题 第三个以后就会没有removeBtn */
cell.removeBtn.hidden = NO;
// cell.addBtn.userInteractionEnabled = NO;
[cell.addBtn setImage:self.arrayPicture[indexPath.item - 1] forState:UIControlStateNormal];
}
}
/** 设置addBtn用户交互 根据removeBtn是否隐藏 */
cell.addBtn.userInteractionEnabled = cell.removeBtn.hidden;
return cell;
}
/** 设置组间距 */
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
/** 上 左 下 右 */
return UIEdgeInsetsMake(10, 10, 0, 10);
}
/** 隐藏状态栏 */
-(BOOL)prefersStatusBarHidden {
return YES;
}
#pragma mark 实现代理方法
/** 添加图片 */
- (void)addPicture:(YHPPictureChoiceCell *)cell {
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
NSLog(@"不允许打开相册");
return;
}
/** 记录当前选中的cell */
self.selectedIndex = (NSInteger)[self.collectionView indexPathForCell:cell];
/** 创建图片选择控制器 */
UIImagePickerController * picker = [[UIImagePickerController alloc]init];
/** 设置代理为自己 */
picker.delegate = self;
/** 允许编辑 */
picker.allowsEditing = YES;
/** modal出图片选择控制器 */
[self presentViewController:picker animated:YES completion:nil];
}
/** 移除图片 */
- (void)removePicture:(YHPPictureChoiceCell *)cell {
// NSLog(@"remove");
// 1. 获取照片索引
NSIndexPath * indexpath = [self.collectionView indexPathForCell:cell];
// 2. 判断索引是否超出上限
if (indexpath.item > self.arrayPicture.count + 1) {
return;
} else if (self.arrayPicture.count > 0) {
/** 移除选中的cell */
[self.arrayPicture removeObjectAtIndex:(indexpath.item - 1)];
}
/** 刷新数据 */
[self.collectionView reloadData];
}
#pragma mark - UIImagePickerControllerDelegate
/** 选择完毕获取到图片的代理方法 */
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
/** 将图片存入数组 */
UIImage * scaleimage = info[UIImagePickerControllerEditedImage];
scaleimage = [scaleimage scaleImageWithWidth:600];
/** 如果当前索引>数组总数 不添加 */
if (self.selectedIndex >= self.arrayPicture.count) {
[self.arrayPicture addObject:scaleimage];
} else {
/** 否则添加 */
self.arrayPicture[(NSInteger)_selectedIndex] = scaleimage;
}
/** 刷新数据 */
[self.collectionView reloadData];
/** dismiss控制器 */
[self dismissViewControllerAnimated:YES completion:nil];
}
@end
UIImage分类
#import "UIImage+Extension.h"
@implementation UIImage (Extension)
- (instancetype)scaleImageWithWidth:(CGFloat)width {
if (width > self.size.width) {
return self;
}
CGFloat height = self.size.height * width / self.size.width;
CGRect rect = CGRectMake(0, 0, width, height);
/** 开启上下文 */
UIGraphicsBeginImageContext(rect.size);
/** 绘制 */
[self drawInRect:rect];
/** 取结果 */
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
/** 关闭上下文 */
UIGraphicsEndPDFContext();
return image;
}
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