presentLimitedLibraryPickerFromV

iOS14相册权限进行了改变，下面是调用起系统相册的方式，弹起是正常的，但是界面有比较奇怪的变化，搜索栏是透明的，要点击一次，才能正常显示。
如果你也遇到类似问题，希望这个文章能有帮到你们。

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- (void)checkAlbumPermission {

   if (@available(iOS 14, *)) {
       __weak PhotoCollectionController *weakSelf = self;
       PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatusForAccessLevel:PHAccessLevelReadWrite];
       if (status == PHAuthorizationStatusLimited) {
           weakSelf.addButton.hidden = NO; // 添加图片按钮不隐藏
       }
   }
   
//    if (@available(iOS 14, *)) {
//        [PHPhotoLibrary requestAuthorizationForAccessLevel:PHAccessLevelReadWrite handler:^(PHAuthorizationStatus status) {
//            switch (status) {
//                case PHAuthorizationStatusLimited:
//                {
//                    [self selectAlbum];
//                }
//                    break;
//                case PHAuthorizationStatusDenied:
//                case PHAuthorizationStatusRestricted:
//                {
//                    [self alertAlbum];
//                }
//                default:
//                {
//                    [self selectAlbum];
//                }
//                    break;
//            }
//        }];
//    } else {
//        // Fallback on earlier versions
//    }
}

// 点击按钮调用的方法
- (void)selectAlbum {
    //判断相册是否可用
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        if (@available(iOS 14, *)) {
            [[PHPhotoLibrary sharedPhotoLibrary] presentLimitedLibraryPickerFromViewController:self];
        }else {
            [self presentViewController:self.imagePickerController animated:YES completion:^{
            }];
        }

    }
}

原因是：[[UINavigationBar appearance] setBackgroundImage:bgImage forBarMetrics:UIBarMetricsDefault]; 设置背景图片的时候影响到系统了。
最后解决方式是对iOS13的UINavigationBar的新特性适配。

[[UINavigationBar appearance] setTranslucent:NO]; //对iOS13之后的控制器高度有影响,所以这个放在外面设置
    if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        [appearance configureWithDefaultBackground];
        appearance.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor grayColor], NSFontAttributeName:[UIFont systemFontOfSize:17]};
        UIImage *bgImage = [UIImage resizableImageWithColor:[UIColor lightGrayColor]]; // 自定的方法，获取图片，你们加载自己的图片就可以了
        appearance.backgroundImage = bgImage;
        appearance.backgroundColor = [UIColor lightGrayColor];
        [UINavigationBar appearance].standardAppearance = appearance;
    } else {
    //    [[UINavigationBar appearance] setOpaque:YES];
        [[UINavigationBar appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor grayColor], NSFontAttributeName:[UIFont systemFontOfSize:17]}];
        //替换bar最下面的得阴影
        UIImage *bgImage = [UIImage resizableImageWithColor:[UIColor lightGrayColor]]; // 自定的方法，获取图片，你们加载自己的图片就可以了 
        [[UINavigationBar appearance] setBackgroundImage:bgImage forBarMetrics:UIBarMetricsDefault];
        [[UINavigationBar appearance] setBarTintColor:[UIColor lightGrayColor]];
    }

参考文章：https://www.jianshu.com/p/bd038bf2373e