一：效果

二：代码

相机部分就简单多了，几行代码调用而已，但是如果你要是想实现更多丰富的功能，需要自己写。利用AssetsLibrary.framework，利用这个框架可以获得手机上的所有相册图片，写一个图片选择控制器。

- (void)openCamera
{
    [self openImagePickerController:UIImagePickerControllerSourceTypeCamera];
}

- (void)openAlbum
{
    // 如果想自己写一个图片选择控制器，得利用AssetsLibrary.framework，利用这个框架可以获得手机上的所有相册图片
    // UIImagePickerControllerSourceTypePhotoLibrary > UIImagePickerControllerSourceTypeSavedPhotosAlbum
    [self openImagePickerController:UIImagePickerControllerSourceTypePhotoLibrary];
}

- (void)openImagePickerController:(UIImagePickerControllerSourceType)type
{
    if (![UIImagePickerController isSourceTypeAvailable:type]) return;

    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType = type;
    ipc.delegate = self;
    [self presentViewController:ipc animated:YES completion:nil];
}

实现代理

#pragma mark - UIImagePickerControllerDelegate
/**
 * 从UIImagePickerController选择完图片后就调用（拍照完毕或者选择相册图片完毕）
 */
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:nil];

    // info中就包含了选择的图片
    UIImage *image = info[UIImagePickerControllerOriginalImage];

    // 添加图片到photosView中
    [self.photosView addPhoto:image];

//    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
//        self.picking = NO;
//    });
}