iOS-自定义照片选择器+裁剪图片

这两天产品说我用系统的UIImagePickerController界面UI很丑，迫不得已下就选择了自定义一个照片选择器。实现效果如下图：

demo中3张效果图.png

实现步骤

具体实现就两个步骤：
1.用系统的<Photos/Photos.h>框架异步获取到相册中的所有图片（包括原图和缩略图），然后用collectionview进行展示缩略图。
2.再对获取到相册图片的原图进行裁剪，分圆形裁剪和方形裁剪。裁剪框路径使用贝塞尔曲线分别设置的路径

//设置圆形路径。
 + (instancetype)bezierPathWithOvalInRect:(CGRect)rect; 
//设置带有圆角的矩形路径
 + (instancetype)bezierPathWithRoundedRect:(CGRect)rect cornerRadius:(CGFloat)cornerRadius ```

######具体代码
写了个```UIImage+Extension.h```的分类，异步并发获取到所有图片

/**
获取系统相册中所有的缩略图 和原图
缩略图 尺寸 大约 {32.5，60} (allSmallImageArray 回调获取到的缩略图 图片数组)
原图 尺寸 大约 屏幕等大 （allOriginalImageArray 回调获取到的大图 图片数组)

*/

• (void)async_getLibraryPhoto:(void(^)(NSArray <UIImage *> *allSmallImageArray))smallImageCallBack
  allOriginalImageCallBack:(void(^)(NSArray <UIImage *> *allOriginalImageArray))allOriginalImageCallBack
  {
  static UIImage *image;image = [UIImage new];
  dispatch_queue_t concurrencyQueue = dispatch_queue_create("getLibiaryAllImage-queue",
  DISPATCH_QUEUE_CONCURRENT);
  // task 1 ： 获得相册中所有 缩略图
  dispatch_async(concurrencyQueue, ^{
  NSMutableArray *smallPhotoArray = [NSMutableArray array];
  [smallPhotoArray addObjectsFromArray:[UIImage getImageWithScaleImage:image isOriginalPhoto:NO]];
  dispatch_async(dispatch_get_main_queue(), ^{
  if (smallImageCallBack) {
  smallImageCallBack([smallPhotoArray copy]);
  }
  });
  });
  // task 2 ： 获得相册中所有 原图
  dispatch_async(concurrencyQueue, ^{
  NSMutableArray *allOriginalPhotoArray = [NSMutableArray array];
  [allOriginalPhotoArray addObjectsFromArray:[UIImage getImageWithScaleImage:image isOriginalPhoto:YES]];
  dispatch_async(dispatch_get_main_queue(), ^{
  if (allOriginalImageCallBack) {
  allOriginalImageCallBack([allOriginalPhotoArray copy]);
  }
  });
  });
  }
• (NSArray <UIImage *> *)getImageWithScaleImage:(UIImage *)image isOriginalPhoto:(BOOL)isOriginalPhoto
  {
  NSMutableArray *photoArray = [NSMutableArray array];
  // 获得所有的自定义相册
  PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
  // 遍历所有的自定义相册
  for (PHAssetCollection *assetCollection in assetCollections) {
  [photoArray addObjectsFromArray:[image enumerateAssetsInAssetCollection:assetCollection original:isOriginalPhoto]];
  }
  // 获得相机胶卷相册
  PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;
  [photoArray addObjectsFromArray:[image enumerateAssetsInAssetCollection:cameraRoll original:isOriginalPhoto]];
  return photoArray;
  }

/**

• 遍历相簿中的所有图片
• @param assetCollection 相册
• @param original 是否需要原图
  */

• (NSArray <UIImage *> *)enumerateAssetsInAssetCollection:(PHAssetCollection *)assetCollection original:(BOOL)original
  {
  NSMutableArray *array = [NSMutableArray array];
  PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
  // 同步获得图片
  options.synchronous = YES;
  // 获得某个相簿中的所有PHAsset对象
  PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
  for (PHAsset *asset in assets) {
  CGSize size = original ? CGSizeMake(asset.pixelWidth, asset.pixelHeight) : CGSizeZero;
  // 从asset中获得图片
  [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
  [array addObject:result];
  }];
  }
  return array;
  } ```

然后自定义一个照片控制器继承于UICollectionViewController ，设置代理回调方法和初始化方法
HPPhotoPickerController.h

#import <UIKit/UIKit.h>

@class HPPhotoPickerController;

@protocol HPPhotoPickerControllerDelegate <NSObject>

- (void)imagePickerController:(HPPhotoPickerController *)picker didFinishPickingWithImage:(UIImage *)image;

@end

@interface HPPhotoPickerController : UICollectionViewController

@property (nonatomic ,weak) id <HPPhotoPickerControllerDelegate> delegate;

/**
 照片 选择控制器 初始化 方法

 @param delegate  控制器代理
 @param isOvalClip 裁剪方式  YES : 正方形裁剪  NO ：圆形裁剪
 @param layout 控制器 layout
 @return self
 */
- (instancetype)initWithDelegate:(id)delegate
              isOvalClip:(BOOL)isOvalClip
              flowLayout:(UICollectionViewFlowLayout *)layout;

@end ```

```HPPhotoPickerController.m```获取图片然后去下个界面进行裁剪

#import "HPPhotoPickerController.h"
#import "UIImage+Extension.h"
#import "HPPhotoPickerDetailController.h"

@class HPPickerImageViewCell;

@interface HPPhotoPickerController ()<UICollectionViewDelegateFlowLayout>
{
    BOOL  _isOvalClip;
}
@property (nonatomic ,strong) NSMutableArray *smallphotoArray;
@property (nonatomic ,strong) NSMutableArray *bigPhotoArray;

@end

@implementation HPPhotoPickerController

static NSString * const reuseIdentifier = @"Cell";

- (void)getData
{
    [UIImage async_getLibraryPhoto:^(NSArray<UIImage *> *allSmallImageArray) {
        NSLog(@"***小**%ld",allSmallImageArray.count);
        [self.smallphotoArray addObjectsFromArray:allSmallImageArray];
        [self.collectionView reloadData];
    } allOriginalImageCallBack:^(NSArray<UIImage *> *allOriginalImageArray) {
        NSLog(@"***大**%ld",allOriginalImageArray.count);
        [self.bigPhotoArray addObjectsFromArray:allOriginalImageArray];
    }];
}

#pragma mark <UICollectionViewDataSource>

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
  
    if (self.smallphotoArray.count > 0) {
        return self.smallphotoArray.count;
    }
    return 0;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    HPPickerImageViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
    cell.photo.image = self.smallphotoArray[indexPath.row];
    return cell;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
     //判断大于0，是做安全处理，大图加载慢，防止还没加载完毕就push，造成数据传空
    if (self.bigPhotoArray.count > 0) {
        HPPhotoPickerDetailController *detailVC = [[HPPhotoPickerDetailController alloc]initWithImage:self.bigPhotoArray[indexPath.row] delegate:self];
        detailVC.ovalClip = _isOvalClip;
         [self.navigationController pushViewController:detailVC animated:YES];
    }
} ```

裁剪图片的控制器是参照这位同学写的[iOS实现头像裁剪（方或圆）功能，支持缩放拖曳](http://www.jianshu.com/p/d9ca82c1834c)

[这是demo地址，大家加油，开源使人进步。。。](https://github.com/leijianmin/PhotoPickerController)