相册的操作

之前必须签订协议: UIImagePickerControllerDelegate, UINavigationControllerDelegate

1. 保存到用户的相册里面

UIImageWriteToSavedPhotosAlbum(newImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
 
保存相册后回调
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error == nil) {
保存成功" toView:self.view];
    } else {
保存失败" toView:self.view];
    }
    
}

2. 点击按钮去相册

- (IBAction)selectPhotoes:(UIBarButtonItem *)sender {
//照片选择器
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    
    // 数据源
    picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    /**
     UIImagePickerControllerSourceTypePhotoLibrary,
     UIImagePickerControllerSourceTypeCamera,
     UIImagePickerControllerSourceTypeSavedPhotosAlbum
     */

显示照片选择器
    [self presentViewController:picker animated:YES completion:^{
        
    }];
}

3. 选中照片的时候调用

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info