iOS中相册的学习记录

来源：互联网发布：广州网络优化编辑：程序博客网时间：2024/05/17 15:58

用一个tableView区分照片和video

#import "ViewController.h"@interface ViewController ()@property(nonatomic,strong)UITableView *tableView;@property(nonatomic,strong)NSMutableArray *assets;// 照片数组@property(nonatomic,strong)NSMutableArray *videoArr;// 视频数组@property(nonatomic,strong)ALAssetsLibrary *library;@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    self.view.backgroundColor = [UIColor blackColor];        NSLog(@"%ld", [ALAssetsLibrary authorizationStatus]);        self.assets = [[NSMutableArray alloc]initWithCapacity:0];    self.videoArr = [[NSMutableArray alloc]initWithCapacity:0];        self.tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 50, 320, 416) style:UITableViewStyleGrouped];    self.tableView.delegate = self;    self.tableView.dataSource = self;    [self.view addSubview:self.tableView];        UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, self.tableView.frame.size.height+70, 320, 80)];    view.backgroundColor = [UIColor yellowColor];    UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];    btn1.frame = CGRectMake(10, 10, 100, 50);    [btn1 setTitle:@"测试添加相册" forState:UIControlStateNormal];    [btn1 addTarget:self action:@selector(addGroud) forControlEvents:UIControlEventTouchUpInside];    [view addSubview:btn1];    [self.view addSubview:view];        self.library = [[ALAssetsLibrary alloc] init];    void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {        if(result != NULL) {                        if ([result valueForProperty:ALAssetPropertyType] == ALAssetTypeVideo) {                [self.videoArr addObject:result];            }else if([result valueForProperty:ALAssetPropertyType] == ALAssetTypePhoto){                [self.assets addObject:result];            }                    }    };        //便利相册    void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) =  ^(ALAssetsGroup *group, BOOL *stop) {        if(group != nil) {            [group enumerateAssetsUsingBlock:assetEnumerator];        }                [self.tableView reloadData];    };    //    //便利所有相册    [self.library enumerateGroupsWithTypes:ALAssetsGroupAll                           usingBlock:assetGroupEnumerator                         failureBlock: ^(NSError *error) {                             NSLog(@"便利所有相册");                                                      }];            [self.tableView reloadData];     }- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 2;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {        if (section == 0) {                if ([self.assets count]>5) {            return 5;        }else{            return [self.assets count];        }            }else{                if ([self.videoArr count]>5) {            return 5;        }else{            return [self.videoArr count];        }            }    }- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    static NSString *CellIdentifier = @"Cell";        UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];    if (cell == nil) {        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];    }            if (indexPath.section == 0) {        ALAsset *asset = [self.assets objectAtIndex:indexPath.row];                struct CGImage *imagecg = asset.thumbnail;        UIImage *image = [UIImage imageWithCGImage:imagecg];                [cell.imageView setImage:image];        [cell.textLabel setText:[NSString stringWithFormat:@"Photo %d", indexPath.row+1]];    }else if (indexPath.section == 1){                ALAsset *asset = [self.videoArr objectAtIndex:indexPath.row];                struct CGImage *imagecg = asset.thumbnail;        UIImage *image = [UIImage imageWithCGImage:imagecg];                [cell.imageView setImage:image];        [cell.textLabel setText:[NSString stringWithFormat:@"video %d", indexPath.row+1]];    }    return cell;}

添加一个图片到默认相册

//添加图片到相册    NSString *path = [[NSBundle mainBundle] pathForResource:@"123" ofType:@"png"];    NSURL *urll = [NSURL fileURLWithPath:path];    NSData *data = [NSData dataWithContentsOfURL:urll];    [_library writeImageDataToSavedPhotosAlbum:data metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {            }];        //保存图片到系统默认的相册中，使用nsdata的形式，并返回照片的url地址    [_library writeImageDataToSavedPhotosAlbum:nil metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {        }];

创建一个相册

- (void)addGroud{    [self.library addAssetsGroupAlbumWithName:@"测试添加相册" resultBlock:^(ALAssetsGroup *group) {        NSLog(@"addAssetsGroupAlbumWithName");        //        //查看相册的名字        NSLog(@"ALAssetsGroupPropertyName:%@",[group valueForProperty:ALAssetsGroupPropertyName]);        //        //查看相册的类型        NSLog(@"ALAssetsGroupPropertyType:%@",[group valueForProperty:ALAssetsGroupPropertyType]);        //        //查看相册的存储id        NSLog(@"ALAssetsGroupPropertyPersistentID:%@",[group valueForProperty:ALAssetsGroupPropertyPersistentID]);        //        //查看相册存储的位置地址        NSLog(@"ALAssetsGroupPropertyURL:%@",[group valueForProperty:ALAssetsGroupPropertyURL]);        NSURL *groupURL = [group valueForProperty:ALAssetsGroupPropertyURL];            } failureBlock:^(NSError *error) {        NSLog(@"ERR : %@",error);    }];}

保存video到相册

//保存video到相册- (void)saveVideo:(NSString *)videoPath toAlbum:(NSString *)albumName withCompletionBlock:(SaveImageCompletion)completionBlock{    [self writeVideoAtPathToSavedPhotosAlbum:[NSURL fileURLWithPath:videoPath]                             completionBlock:^(NSURL *assetURL, NSError *error) {                                 if (error!=nil) {                                     completionBlock(error);                                     return;                                 }                                                                  //add the asset to the custom photo album                                 [self addAssetURL: assetURL                                           toAlbum:albumName                               withCompletionBlock:completionBlock];                             }];}-(void)addAssetURL:(NSURL*)assetURL toAlbum:(NSString*)albumName withCompletionBlock:(SaveImageCompletion)completionBlock{    __block BOOL albumWasFound = NO;        //search all photo albums in the library    //遍历相册    [self enumerateGroupsWithTypes:ALAssetsGroupAlbum                         usingBlock:^(ALAssetsGroup *group, BOOL *stop) {                            //compare the names of the albums                            if ([albumName compare: [group valueForProperty:ALAssetsGroupPropertyName]]==NSOrderedSame) {                                                                //target album is found                                albumWasFound = YES;                                                                //get a hold of the photo's asset instance                                //通过url得到asset                                [self assetForURL: assetURL                                       resultBlock:^(ALAsset *asset) {                                                                                            //add photo to the target album                                          [group addAsset: asset];                                                                                    //run the completion block                                          completionBlock(nil);                                                                                } failureBlock: completionBlock];                                //album was found, bail out of the method                                return;                            }                                                        //如果没有 创建相册加入asset                            if (group==nil && albumWasFound==NO) {                                //photo albums are over, target album does not exist, thus create it                                                                ALAssetsLibrary* weakSelf = self;                                //create new assets album                                [self addAssetsGroupAlbumWithName:albumName                                                       resultBlock:^(ALAssetsGroup *group) {                                                                                                                            //get the photo's instance                                                          [weakSelf assetForURL: assetURL                                                                         resultBlock:^(ALAsset *asset) {                                                                            //add photo to the newly created album                                                                            [group addAsset: asset];                                                                                                                                                        //call the completion block                                                                            completionBlock(nil);                                                                        } failureBlock: completionBlock];                                                                                                                } failureBlock: completionBlock];                                //should be the last iteration anyway, but just in case                                return;                            }                                                    } failureBlock: completionBlock];    }

保存png到指定相册

//保存图片到系统默认的相册中，使用cgimageref的形式，并且选择图片以什么旋转方向的形式保存，并返回照片的url地址    /*     typedef enum {     ALAssetOrientationUp,            // default orientation     ALAssetOrientationDown,          // 180 deg rotation     ALAssetOrientationLeft,          // 90 deg CCW     ALAssetOrientationRight,         // 90 deg CW     ALAssetOrientationUpMirrored,    // as above but image mirrored along other axis. horizontal flip     ALAssetOrientationDownMirrored,  // horizontal flip     ALAssetOrientationLeftMirrored,  // vertical flip     ALAssetOrientationRightMirrored, // vertical flip     } ALAssetOrientation;     */    UIImage* image = [UIImage imageNamed:@"123"];    [_library writeImageToSavedPhotosAlbum:[image CGImage] orientation:ALAssetOrientationLeft completionBlock:^(NSURL *assetURL, NSError *error) {        NSLog(@"save image:%@",assetURL);        //通过ALAssetsLibrary迭代取出所有相册        [_library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {            NSString* groupname = [group valueForProperty:ALAssetsGroupPropertyName];            //如果相册的名称是test的时候，对其进行操作            if ([groupname isEqualToString:@"测试添加相册"]) {                //设置相册组的筛选条件，ALAssetsFilter类表示筛选条件，allPhotos代表相册只包含相片，allVideos代表只包含视频，allAssets代表包含所有资源                [group setAssetsFilter:[ALAssetsFilter allPhotos]];                //通过刚保存的照片的url，把保存到默认相册的照片也保存到test相册中                [_library assetForURL:assetURL resultBlock:^(ALAsset *asset) {                    //添加资源到指定的相册                    [group addAsset:asset];                    //获取相册中一共的资源数量                    int count = [group numberOfAssets];                    NSLog(@"count:%d",count);                    dispatch_queue_t main = dispatch_get_main_queue();                    dispatch_async(main, ^{                        //获取相册的封面图片                        CGImageRef poster = [group posterImage];                                            });                    //NSString *const ALAssetsGroupPropertyName;                    //NSString *const ALAssetsGroupPropertyType;                    //NSString *const ALAssetsGroupPropertyPersistentID;                    //NSString *const ALAssetsGroupPropertyURL;                    //查看相册的名字                    NSLog(@"ALAssetsGroupPropertyName:%@",[group valueForProperty:ALAssetsGroupPropertyName]);                    //查看相册的类型                    NSLog(@"ALAssetsGroupPropertyType:%@",[group valueForProperty:ALAssetsGroupPropertyType]);                    //查看相册的存储id                    NSLog(@"ALAssetsGroupPropertyPersistentID:%@",[group valueForProperty:ALAssetsGroupPropertyPersistentID]);                    //查看相册存储的位置地址                    NSLog(@"ALAssetsGroupPropertyURL:%@",[group valueForProperty:ALAssetsGroupPropertyURL]);                    //按遍历顺序获取指定索引的资源，遍历顺序可以是先序或倒序                    /*                     enum {                     NSEnumerationConcurrent = (1UL << 0),                     NSEnumerationReverse = (1UL << 1),                     };                     typedef NSUInteger NSEnumerationOptions;                     */                    [group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:0] options:NSEnumerationConcurrent usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {                                            }];                    //按顺便遍历获取相册中所有的资源，index代表资源的索引，stop赋值为false时，会停止遍历                    [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {                                            }];                    //按顺便遍历获取相册中所有的资源，遍历顺序可以是先序或倒序，index代表资源的索引，stop赋值为false时，会停止遍历                    [group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {                                            }];                                    } failureBlock:^(NSError *error) {                                    }];            }        } failureBlock:^(NSError *error) {                    }];    }];

参考文章:http://blog.csdn.net/kingsley_cxz/article/category/1466803

0 0