作品鏈接：http://www.itdecent.cn/users/1e0f5e6f73f6/top_articles
1.導(dǎo)入第三方框架SVProgressHUD 和 Photos框架
#import<SVProgressHUD.h>
#import<Photos/Photos.h>
2.創(chuàng)建全局變量相簿的名稱
static NSString * PHAssetCollectionTitle = @"卡卡";
3.保存按鈕
- (IBAction)save {
// 判斷授權(quán)狀態(tài)
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusRestricted) {
[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")
NSLog(@"提醒用戶去[設(shè)置-隱私-照片-xxx]打開(kāi)訪問(wèn)開(kāi)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) {
[self saveImage];
}
}];
}
}
4.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 即圖片對(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 createdAssetCollection];
if (createdAssetCollection == nil) {
[self showError:@"保存圖片失敗"];
return ;
}
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 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"];
} else{
[self showSuccess:@"保存圖片成功"];
}
}];
}];
}
5.獲得相簿
- (PHAssetCollection *)createdAssetCollection{??
? PHFetchResult*assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
for (PHAssetCollection *assetCollection in assetCollections) {
if ([assetCollection.localizedTitle isEqualToString:PPHAssetCollectionTitle]) {
return assetCollection;
}
}
// 沒(méi)有找到對(duì)應(yīng)的相簿, 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的對(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:PPHAssetCollectionTitle].placeholderForCreatedAssetCollection.localIdentifier;
} error:&error];
if (error) return nil;
// 獲得剛才創(chuàng)建的相簿
PHAssetCollection *assetCollection = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[assetCollectionLocalIdentifier] options:nil].lastObject;
return assetCollection;
}
6.保存成功方法
- (void)showSuccess:(NSString *)text
{
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD showSuccessWithStatus:text];
});
}
7.保存失敗方法
- (void)showError:(NSString *)text
{
dispatch_async(dispatch_get_main_queue(), ^{
[SVProgressHUD showErrorWithStatus:text];
});
}
