iOS中自定义相册(下)

2016-10-31 本文已影响232人傲视苍穹

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

创建单列类和初始化属性。

-(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

/**
 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

/**
 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

/**
 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);
    }];
    
}

从图片资源获得图片NSData

  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

保存图片

- (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]; 
     } }]; 
}}

根据图片保存为图片资源


- (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

/** * 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;}

成功和失败的提示信息

- (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]; 
});
}

iOS中自定义相册(下)

自定义相册

利用UIImagePickerController挑选图片

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

保存图片到自定义相册

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