```
一.保存到系统相册 1.调用系统的方法,必须用系统的方法 UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinshSavingWithError:contextInfo:), nil); 2.调用方法,发挥保存是否成功的信息 -(void)image:(UIImage *)image didFinshSavingWithError:(NSError *)error contextInfo:(void*)contextInfo{ if (error) { [SVProgressHUD showErrorWithStatus:@"保存失败"]; }else { [SVProgressHUD showSuccessWithStatus:@"保存成功"]; }}```----------------````二.保存到自定义相册 1.苹果保存图片到自己相册业务逻辑:把图片保存到系统相册中,在从系统相册中拷贝一份到自己相册. 2.使用苹果的框架.
3. photos框架:专门处理相册
4.pgotos框架基本类
PHPhotoLibrary:相簿(所有相册集合)
PHAsset:图片(资源文件)
PHAssetCollection:相册(所有图片集合)
PHAssetCreationRequest:创建,删除,修改图片,必须要有这个类
PHAssetCollectionChangeRequest:创建,删除,修改相册,必须要创建这个类
photos框架使用规则:要操作相册或者相片,必须发送请求
````
-------
```
三. photos框架的基本使用
//搜索自定义相册
- (PHAssetCollection *)fetchAlbum
{
// 获取系统相册
PHFetchResult *resul = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
// 遍历系统相册
for (PHAssetCollection *assetCollection in resul) {
if ([assetCollection.localizedTitle isEqualToString:XMGAlbumTitle]) {
return assetCollection;
}
}
return nil;
}
//保存图片方法
-(void)savePhoto
{
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// 判断是否已经存在相册,如果已经存在,保存到之前相册,无则创建相册
PHAssetCollection *album = [self fetchAlbum];
// 创建相册请求类
PHAssetCollectionChangeRequest *assetCollectionChangeRequest;
if (album) {
// 获取相册
assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:album];
}else{
// 创建自己的相册(相册请求类:创建相册)
PHAssetCollectionChangeRequest *assetCollectionChangeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:XMGAlbumTitle];
}
// 创建图片请求类
PHAssetCreationRequest *assetCreationRequest = [PHAssetCreationRequest creationRequestForAssetFromImage:self.imageView.image];
// 添加图片到相册(相册请求类)
[assetCollectionChangeRequest addAssets:@[assetCreationRequest.placeholderForCreatedAsset]];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
if (success) {
[SVProgressHUD showSuccessWithStatus:@"保存成功"];
}else{
[SVProgressHUD showErrorWithStatus:@"保存失败"];
}
}];
}
```
---------------
```
四.photos框架的用户授权问题
获取用户访问相册状态
PHAuthorizationStatusNotDetermined : 不决定
PHAuthorizationStatusRestricted : 手机被家长控制,不能修改状态
PHAuthorizationStatusDenied :拒绝
PHAuthorizationStatusAuthorized :允许
---------------------------------------------------------
switch ([PHPhotoLibrary authorizationStatus]) {
case PHAuthorizationStatusNotDetermined:
{
// 不确定 => 弹出框,询问用户是否允许访问系统相册
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
// 保存图片
[self savePhoto];
}
}];
break;
}
case PHAuthorizationStatusAuthorized:
{
// 授权 => 保存图片
[self savePhoto];
break;
}
default:
{
// 拒绝 => 弹出框,告诉用户,允许访问相册
[SVProgressHUD showInfoWithStatus:@"设置 -> 百思不得姐 -> 打开允许访问相册开关"];
}
}
;
```
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