iOS实现图片保存与搜索功能

本文实现photos.framework的常见功能，包括：创建自定义相册、保存图片到自定义相册、搜索所有相册的图片，具体内容如下
1、保存图片到相册

/**
 * 保存图片到相册
 */
- (ibaction)saveimage {
  phauthorizationstatus status = [phphotolibrary authorizationstatus];
  if (status == phauthorizationstatusdenied) {
    nslog(@"请到【设置-隐私-照片】打开访问开关");
  } else if (status == phauthorizationstatusrestricted) {
    nslog(@"无法访问相册");
  } else {
    // 保存相片的标识
    __block nsstring *assetid = nil;
       
    [[phphotolibrary sharedphotolibrary] performchanges:^{
      // 保存相片到相机胶卷，并返回标识
      assetid = [phassetcreationrequest creationrequestforassetfromimage:[uiimage imagenamed:@"logo"]].placeholderforcreatedasset.localidentifier;
    } completionhandler:^(bool success, nserror * _nullable error) {
      if (!success) {
        nslog(@"保存失败：%@", error);
        return;
      }
         
      // 根据标识获得相片对象
      phasset *asset = [phasset fetchassetswithlocalidentifiers:@[assetid] options:nil].lastobject;
         
      // 拿到自定义的相册对象
      phassetcollection *collection = [self collection];
      if (collection == nil) return;
         
      // 保存相片到自定义相册中
      [[phphotolibrary sharedphotolibrary] performchanges:^{
        [[phassetcollectionchangerequest changerequestforassetcollection:collection] addassets:@[asset]];
      } completionhandler:^(bool success, nserror * _nullable error) {
        if (success) {
          nslog(@"保存成功");
        } else {
          nslog(@"保存失败：%@", error);
        }
      }];
    }];
  }
}

2、搜索所有相片

/**
 * 查询所有的图片
 */
- (ibaction)searchallimages {
     
  // 遍历所有的自定义相册
  phfetchresult<phassetcollection *> *collectionresult0 = [phassetcollection fetchassetcollectionswithtype:phassetcollectiontypealbum subtype:phassetcollectionsubtypealbumregular options:nil];
  for (phassetcollection *collection in collectionresult0) {
    [self searchallimagesincollection:collection];
  }
     
  // 获得相机胶卷的图片
  phfetchresult<phassetcollection *> *collectionresult1 = [phassetcollection fetchassetcollectionswithtype:phassetcollectiontypesmartalbum subtype:phassetcollectionsubtypealbumregular options:nil];
  for (phassetcollection *collection in collectionresult1) {
    if (![collection.localizedtitle isequaltostring:@"camera roll"]) continue;
    [self searchallimagesincollection:collection];
    break;
  }
}
   
/**
 * 查询某个相册里面的所有图片
 */
- (void)searchallimagesincollection:(phassetcollection *)collection
{
  // 采取同步获取图片（只获得一次图片）
  phimagerequestoptions *imageoptions = [[phimagerequestoptions alloc] init];
  imageoptions.synchronous = yes;
     
  nslog(@"相册名字：%@", collection.localizedtitle);
     
  // 遍历这个相册中的所有图片
  phfetchresult<phasset *> *assetresult = [phasset fetchassetsinassetcollection:collection options:nil];
  for (phasset *asset in assetresult) {
    // 过滤非图片
    if (asset.mediatype != phassetmediatypeimage) continue;
       
    // 图片原尺寸
    cgsize targetsize = cgsizemake(asset.pixelwidth, asset.pixelheight);
    // 请求图片
    [[phimagemanager defaultmanager] requestimageforasset:asset targetsize:targetsize contentmode:phimagecontentmodedefault options:imageoptions resulthandler:^(uiimage * _nullable result, nsdictionary * _nullable info) {
      nslog(@"图片：%@", result);
    }];
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助。