自定义相册
- 第一首先创建一个管理相片的单列类 （必须导入相册对应的类库
@import Photos; @import UIKit;）
注：collection.localizedTitle 相薄名字
- 需要定义必要的一些属性和回调Block。
typedef void(^PHAssetCollectionBlock)(NSMutableArray <PHAssetCollection *> * collections);
typedef void(^PHAssetPhotoBlock)(NSMutableArray <PHAsset *> * photos);
typedef void(^PHImgBlock)(UIImage * images);
@property (nonatomic,strong) NSMutableArray<PHAssetCollection*>* collections; //存放所有相薄
-(instancetype)init
{
if (self = [super init])
{
self.collections = [NSMutableArray arrayWithCapacity:0];
}
return self;
}
+(instancetype)shareInstance
{
static RTPhotoManager * photoManager = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
photoManager = [[RTPhotoManager alloc]init];
});
return photoManager;
}
/**
获得所有的自定义相簿和获得相机胶卷
@param successBlock 成功是回调的block
*/
-(void)openPhotosCollectionSuccess:(PHAssetCollectionBlock)successBlock {
// 获得所有的自定义相簿
PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
// 获得相机胶卷
PHAssetCollection *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil].lastObject;
[self.collections addObject:cameraRoll];
for (PHAssetCollection *assetCollection in assetCollections) {
[self.collections addObject:assetCollection];
}
successBlock(self.collections);
}
/**
遍历相簿中的所有图片资源
@param assetCollection 相簿
@param synchronous 是否同步
@param successBlock 成功是回调的block
*/
- (void)enumerateAssetsInAssetCollection:(PHAssetCollection *)assetCollection isSynchronous:(BOOL)synchronous Success:(PHAssetPhotoBlock)successBlock {
PHImageRequestOptions *options = [[PHImageRequestOptions alloc] init];
// 同步获得图片, 只会返回1张图片
options.synchronous = synchronous;
// 获得某个相簿中的所有PHAsset对象
PHFetchResult<PHAsset *> *assets = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
NSMutableArray *assetPhotos = [[NSMutableArray alloc]init];
for (PHAsset *asset in assets) {
[assetPhotos addObject:asset];
}
successBlock(assetPhotos);
}
/**
从图片资源获得图片Image
@param asset 图片资源
@param successBlock 成功是回调的block
@param isThumbnail 是否要缩略图
*/
- (void)getImagesFromPHAsset:(PHAsset*)asset Success:(PHImgBlock)successBlock isGetThumbnailImage:(BOOL)isThumbnail
{
CGSize size = CGSizeZero;
if (!isThumbnail) {
size =CGSizeMake(asset.pixelWidth, asset.pixelHeight);
}
[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
successBlock(result);
}];
}
static PHImageRequestOptions *requestOptions;
if (!requestOptions) {
requestOptions = [[PHImageRequestOptions alloc] init];
//指定请求是否同步执行。
requestOptions.synchronous = YES;
// 图像质量。有三种值：Opportunistic，在速度与质量中均衡；HighQualityFormat，不管花费多长时间，提供高质量图像；FastFormat，以最快速度提供好的质量。 这个属性只有在 synchronous 为 true 时有效。normalizedCropRect：用于对原始尺寸的图像进行裁剪，基于比例坐标。只在 resizeMode 为 Exact 时有效。
requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeOpportunistic;
//对请求的图像怎样缩放。有三种选择：None，不缩放；Fast，尽快地提供接近或稍微 大 于要求的尺寸；Exact，精准提供要求的尺寸
requestOptions.resizeMode =PHImageRequestOptionsResizeModeNone;
}
[[PHImageManager defaultManager] requestImageDataForAsset:asset options:requestOptions resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
[UIImage imageWithData:imageData];
}];
利用UIImagePickerController挑选图片
// UIImagePickerController : 可以从系统自带的App(照片\\\\相机)中获得图片// 判断相册是否可以打开
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) return;
UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
// 打开照片应用(显示所有相簿)
ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
// 打开照片应用(只显示"时刻"这个相簿)
// ipc.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
// 照相机
// ipc.sourceType = UIImagePickerControllerSourceTypeCamera;ipc.delegate = self;
[self presentViewController:ipc animated:YES completion:nil];
#pragma mark - <UIImagePickerControllerDelegate>
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
// 销毁控制器
[picker dismissViewControllerAnimated:YES completion:nil];
// 设置图片 self.imageView.image = info[UIImagePickerControllerOriginalImage];
}
NaN错误- 错误起因:0被当做除数, 比如 10 / 0## 最简单的方法保存图片到相机胶卷
UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
/** * 通过UIImageWriteToSavedPhotosAlbum函数写入图片完毕后就会调用这个方法
* * @param image 写入的图片
* @param error 错误信息
* @param contextInfo UIImageWriteToSavedPhotosAlbum函数的最后一个参数 */
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
if (error) {
[SVProgressHUD showErrorWithStatus:@"图片保存失败!"];
} else {
[SVProgressHUD showSuccessWithStatus:@"图片保存成功!"];
}
}
保存图片到自定义相册
- (void)save {
/* PHAuthorizationStatusNotDetermined,
用户还没有做出选择 PHAuthorizationStatusDenied,
用户拒绝当前应用访问相册(用户当初点击了"不允许") PHAuthorizationStatusAuthorized
用户允许当前应用访问相册(用户当初点击了"好") PHAuthorizationStatusRestricted,
因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系) */
// 判断授权状态 PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus]; if (status == PHAuthorizationStatusRestricted) {
// 因为家长控制, 导致应用无法方法相册(跟用户的选择没有关系)
[SVProgressHUD showErrorWithStatus:@"因为系统原因, 无法访问相册"];
} else if (status == PHAuthorizationStatusDenied) {
// 用户拒绝当前应用访问相册(用户当初点击了"不允许") XMGLog(@"提醒用户去[设置-隐私-照片-xxx]打开访问开关");
} else if (status == PHAuthorizationStatusAuthorized) {
// 用户允许当前应用访问相册(用户当初点击了"好")
[self saveImage];
} else if (status == PHAuthorizationStatusNotDetermined) {
// 用户还没有做出选择 // 弹框请求用户授权
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) { if (status == PHAuthorizationStatusAuthorized) { // 用户点击了好 [self saveImage];
} }];
}}
- (void)saveImage{
// PHAsset : 一个资源, 比如一张图片\\\\一段视频
// PHAssetCollection : 一个相簿
// PHAsset的标识, 利用这个标识可以找到对应的PHAsset对象(图片对象) _
_block NSString *assetLocalIdentifier = nil;
// 如果想对"相册"进行修改(增删改), 那么修改代码必须放在[PHPhotoLibrary sharedPhotoLibrary]的performChanges方法的block中
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 1.保存图片A到"相机胶卷"中 // 创建图片的请求
assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier; } completionHandler:^(BOOL success, NSError * _Nullable error) { if (success == NO) { [self showError:@"保存图片失败!"];
return;
}
// 2.获得相簿
PHAssetCollection *createdAssetCollection = [self createdAssetCollection]; if (createdAssetCollection == nil) { [self showError:@"创建相簿失败!"];
return;
}
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 3.添加"相机胶卷"中的图片A到"相簿"D中
// 获得图片
PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
// 添加图片到相簿中的请求
PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest
changeRequestForAssetCollection:createdAssetCollection];
// 添加图片到相簿 [request addAssets:@[asset]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
//分线程
if (success == NO) { [self showError:@"保存图片失败!"];;
} else { [self showSuccess:@"保存图片成功!"];; } }]; }];}
/** * 获得相簿 */
- (PHAssetCollection *)createdAssetCollection{
// 从已存在相簿中查找这个应用对应的相簿
PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *assetCollection in assetCollections) {
if ([assetCollection.localizedTitle isEqualToString:XMGAssetCollectionTitle]) { return assetCollection; } }
// 没有找到对应的相簿, 得创建新的相簿
// 错误信息 NSError *error = nil;
// PHAssetCollection的标识, 利用这个标识可以找到对应的PHAssetCollection对象(相簿对象)
__block NSString *assetCollectionLocalIdentifier = nil;
[[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
// 创建相簿的请求
assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:XMGAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier; } error:&error];
// 如果有错误信息 if (error) return nil;
// 获得刚才创建的相簿
return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;}
- (void)showSuccess:(NSString *)text{
dispatch_async(dispatch_get_main_queue(), ^{ [SVProgressHUD showSuccessWithStatus:text]; });
}
- (void)showError:(NSString *)text{
dispatch_async(dispatch_get_main_queue(), ^{ [SVProgressHUD showErrorWithStatus:text];
});
}
