需要先导入文件

#import 
    

从相册取得图片信息

// ALAssetsLibrary 销毁了为nil时；下面的group(ALAssetsGroup)、result(ALAsset)就没有了；ALAssetsLibrary可以设置为全局变量就可以在这个文件中取得它的信息，不能传递到其他文件，相=想传到其他文件就要把你想要的信息取出来      ALAssetsLibrary  *library =[[ALAssetsLibrary alloc] init];    [library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {//其中一条group信息//ALAssetsGroup - Name:Camera Roll, Type:Saved Photos, Assets count:82/** ALAssetsGroup 根据[group valueForProperty:<#(NSString *)#>]取得属性*ALAssetsGroupPropertyName 这个组的名字*ALAssetsGroupPropertyType 类型*ALAssetsGroupPropertyPersistentID 相册的ID，也就是相册的文件名*ALAssetsGroupPropertyURL 地址*/     //    [[group valueForProperty:ALAssetsGroupPropertyName] isEqualToString:@"Camera Roll"]//得到这个group所有的图片     [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {        PhotoModel *model = [[PhotoModel alloc]init];        model.date= [sset valueForProperty:ALAssetPropertyDate];//储存日期        model.type = [sset valueForProperty:ALAssetPropertyType];//文件类型        model.url =[sset defaultRepresentation].url;//地址//用UIimage传递图片，cgimageref 会照成内存问题（没有深入解决这个问题?）                model.thumbNailimage =[UIImage imageWithCGImage:[sset thumbnail]];//缩略图                model.fullScreenImage = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullResolutionImage]];//高清图        }            } failureBlock:^(NSError *error) {        NSLog(@"error:%@",error.localizedDescription);    }];

拍照以后把图片保存到相册

#pragma mark--uiimagepickercontroller delegate-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
    
      *)info{    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];    if (picker.sourceType == UIImagePickerControllerSourceTypeCamera)    {         ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];        /**保存图片到相册*/        [assetslibrary writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation completionBlock:^(NSURL *assetURL, NSError *error) {            /**根据assetURL区得在相册中的信息asset*/            [assetslibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {                   NSString *date =[asset valueForProperty:ALAssetPropertyDate];                PhotoModel *model = [[PhotoModel alloc]init];                model.date= date;                model.type = [asset valueForProperty:ALAssetPropertyType];                model.url =[asset defaultRepresentation].url;                model.thumbNailimage =[UIImage imageWithCGImage:[sset thumbnail]];                model.fullScreenImage = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullResolutionImage]];                [self.dataArray addObject:model];                            } failureBlock:^(NSError *error) {                            }];        }];                   }        [picker dismissViewControllerAnimated:YES completion:^{            }];}
    

为了相册选择图片、拍照 让它们的图片信息一致。

拍照时想要设置为中文按钮需要把info.plist的Localization native development region 设置为China