需要導(dǎo)入的頭文件

#import <Photos/Photos.h>
#import <SVProgressHUD.h>

self的兩個(gè)屬性

@property (nonatomic, weak) UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIButton *saveButton;

創(chuàng)建的相簿的名字

static NSString * assetCollectionTitle = @"截圖相簿";

然后實(shí)現(xiàn)下面的幾個(gè)方法就可以了：
這是保存按鈕的點(diǎn)擊事件

- (IBAction)save {
    /*
     PHAuthorizationStatusNotDetermined,     用戶還沒(méi)有做出選擇
     PHAuthorizationStatusDenied,            用戶拒絕當(dāng)前應(yīng)用訪問(wèn)相冊(cè)(用戶當(dāng)初點(diǎn)擊了"不允許")
     PHAuthorizationStatusAuthorized         用戶允許當(dāng)前應(yīng)用訪問(wèn)相冊(cè)(用戶當(dāng)初點(diǎn)擊了"好")
     PHAuthorizationStatusRestricted,        因?yàn)榧议L(zhǎng)控制, 導(dǎo)致應(yīng)用無(wú)法方法相冊(cè)(跟用戶的選擇沒(méi)有關(guān)系)
     */
    
    // 判斷授權(quán)狀態(tài)
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    if (status == PHAuthorizationStatusRestricted) { // 因?yàn)榧议L(zhǎng)控制, 導(dǎo)致應(yīng)用無(wú)法方法相冊(cè)(跟用戶的選擇沒(méi)有關(guān)系)
        [SVProgressHUD showErrorWithStatus:@"因?yàn)橄到y(tǒng)原因, 無(wú)法訪問(wèn)相冊(cè)"];
    } else if (status == PHAuthorizationStatusDenied) { // 用戶 當(dāng)前應(yīng)用訪問(wèn)相冊(cè)(用戶當(dāng)初點(diǎn)擊了"不允許")
        FRLog(@"提醒用戶去[設(shè)置-隱私-照片-xxx]打開訪問(wèn)開關(guān)");
    } else if (status == PHAuthorizationStatusAuthorized) { // 用戶允許當(dāng)前應(yīng)用訪問(wèn)相冊(cè)(用戶當(dāng)初點(diǎn)擊了"好")
        [self saveImage];
    } else if (status == PHAuthorizationStatusNotDetermined) { // 用戶還沒(méi)有做出選擇
        // 彈框請(qǐng)求用戶授權(quán)
        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
            if (status == PHAuthorizationStatusAuthorized) { // 用戶點(diǎn)擊了好
                [self saveImage];
            }
        }];
    }
    
}

保存圖片

- (void)saveImage
{
    // PHAsset : 一個(gè)資源, 比如一張圖片\一段視頻
    // PHAssetCollection : 一個(gè)相簿
    
    // PHAsset的標(biāo)識(shí), 利用這個(gè)標(biāo)識(shí)可以找到對(duì)應(yīng)的PHAsset對(duì)象(圖片對(duì)象)
    __block NSString *assetLocalIdentifier = nil;
    
    // 如果想對(duì)"相冊(cè)"進(jìn)行修改(增刪改), 那么修改代碼必須放在[PHPhotoLibrary sharedPhotoLibrary]的performChanges方法的block中
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        // 1.保存圖片A到"相機(jī)膠卷"中
        // 創(chuàng)建圖片的請(qǐng)求
        assetLocalIdentifier = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image].placeholderForCreatedAsset.localIdentifier;
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
        if (success == NO) {
            [self showError:@"保存圖片失敗"];
            return;
        }
        // 2.獲得相簿
        PHAssetCollection *createdAssetCollection = [self createAssetCollection];
        if (createdAssetCollection == nil) {
            [self showError:@"創(chuàng)建相簿失敗"];
        }
        [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
            // 3.添加"相機(jī)膠卷"中的圖片A到"相簿"D中
            // 獲得圖片
            PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetLocalIdentifier] options:nil].lastObject;
                
            // 添加圖片到相簿中的請(qǐng)求
            PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:createdAssetCollection];
                
            // 添加圖片到相簿
            [request addAssets:@[asset]];
        } completionHandler:^(BOOL success, NSError * _Nullable error) {
            if (success == NO) {
                [self showError:@"保存圖片失敗"];
                return ;
            } else {
                [self showSuccess:@"保存圖片成功"];
            }
        }];
    }];
}

獲得手機(jī)中的相簿浓恳，如果之前沒(méi)有存在就會(huì)創(chuàng)建一個(gè)

/** 獲得相簿 */
- (PHAssetCollection *)createAssetCollection{
    // 從已存在相簿中查找這個(gè)應(yīng)用對(duì)應(yīng)的相簿
    PHFetchResult<PHAssetCollection *> *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
    
    for (PHAssetCollection *assetCollection in assetCollections) {
        if ([assetCollection.localizedTitle isEqualToString:FRAssetCollectionTitle]) {
            return assetCollection;
        }
    }
    
    // 沒(méi)有找到對(duì)應(yīng)的相簿茸歧，得創(chuàng)建新的相簿  ---------------
    
    // 錯(cuò)誤信息
    NSError *error = nil;
    
    // PHAssetCollection的標(biāo)識(shí), 利用這個(gè)標(biāo)識(shí)可以找到對(duì)應(yīng)的PHAssetCollection對(duì)象(相簿對(duì)象)
    __block NSString *assetCollectionLocalIdentifier = nil;
    
    [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
        // 創(chuàng)建相簿的請(qǐng)求
        assetCollectionLocalIdentifier = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:FRAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;
    } error:&error];
    
    // 如果有錯(cuò)誤信息
    if (error) return nil;
    
    // 獲得剛才創(chuàng)建的相簿
    return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;
    // ------------------------------------------------------------
}

保存圖片成功或者失敗給用戶的提示信息

- (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];
    });
}

在項(xiàng)目的適當(dāng)?shù)胤郊由弦陨系拇a就能實(shí)現(xiàn)保存圖片到手機(jī)相簿中了