从胶卷选择图片到imageView(多选)

利用第三方CTAssetsPickerController实现此功能

引入头部

#import <CTAssetsPickerController.h>

设置代理

    @interface MYNewViewController () <CTAssetsPickerControllerDelegate>

viewDidLoad方法

  - (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor blueColor];
[self setNavBar];

UIImageView *image = [[UIImageView alloc] init];
self.imageView = image;
[image sd_setImageWithURL:[NSURL URLWithString:@"https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1531358828&di=80359a01046f117d18a6c4b49507f413&imgtype=jpg&er=1&src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F01f142580daa7ea84a0d304f48cb49.jpg%401280w_1l_2o_100sh.jpg"]];
image.MY_Width = 100;
image.MY_Height = 100;
image.MY_center = self.view.center;
[self.view addSubview:image];

//添加Lable
UILabel *txtLabe = [[UILabel alloc] init];
txtLabe.userInteractionEnabled = YES;
[txtLabe addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleImagePicker)]];
txtLabe.frame = CGRectMake(image.MY_x, image.MY_y+100, 100, 100);
txtLabe.text = @"多选图片";
[self.view addSubview:txtLabe];

}

手势触发方法

  - (void) doubleImagePicker {
//请求/检查权限
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
    //这个方法是在子线程执行 我们需要他回到主线程
    dispatch_async(dispatch_get_main_queue(), ^{
        // init Picker
       CTAssetsPickerController *picker = [[CTAssetsPickerController alloc] init];
         //指定获取哪个胶卷
        picker.assetCollectionSubtypes = @[@(PHAssetCollectionSubtypeSmartAlbumUserLibrary),        @(PHAssetCollectionSubtypeAlbumRegular)];
        //set delegate
        picker.delegate = self;
        
        // to present picker as a from sheet in ipad
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            picker.modalPresentationStyle = UIModalPresentationFormSheet;
        }
        
        //present picker
        [self presentViewController:picker animated:YES
                         completion:nil];
    });
}];
}

代理方法

    - (void)assetsPickerController:(CTAssetsPickerController *)picker didFinishPickingAssets:(NSArray *)assets{
//关闭图片选中界面
[picker dismissViewControllerAnimated:YES completion:nil];

PHImageRequestOptions *options= [[PHImageRequestOptions alloc] init];
options.resizeMode = PHImageRequestOptionsResizeModeExact;
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
//显示图片
    //注意点：NSFastEnumeration 只要类遵守这个代理就能使用for in 循环
//    for (PHAsset *asset in assets) {
//        NSLog(@"%@",asset);
//    }

for (NSInteger i = 0 ; i<assets.count; i++) {
  
    PHAsset *asset = assets[i];
    //取出屏幕缩放比
   CGFloat scale = UIScreen.mainScreen.scale;
    //图片本身大小
    CGSize size = CGSizeMake(asset.pixelWidth/scale, asset.pixelHeight/scale);
    
    //请求图片
    [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeDefault options:options resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
        NSLog(@"%@",result);
        //添加图片控件
        UIImageView *imageView  = [[UIImageView alloc] init];
        imageView.image =result;
        [self.view addSubview:imageView];
        //九宫格布局
        imageView.frame = CGRectMake((i%3)*(100+10),(i/3)*(100+10), 100, 100);
    }];
}

}