导航栏图像上的纵横比填充? [英] Aspect Fill on navigation bar image?

问题描述

我希望为导航控制器的背景图像实现与 imageView 的纵横填充相同的外观.

I'm wanting to achieve the same look as an imageView's aspect fill for my navigation controller's background image.

目前我正在使用它来设置图像:

Currently I'm using this to setup the image:

UINavigationBar.appearance().setBackgroundImage(imageToCache?.resizableImage(withCapInsets: UIEdgeInsetsMake(0, 0, 0, 0), resizingMode: UIImageResizingMode.stretch), for: .default)

UIImageResizingMode.stretch 显然给了我一个令人讨厌的拉伸外观.我不在乎图像是否在顶部/底部被截断，我只需要将其放入全尺寸的导航栏并显示内容.

UIImageResizingMode.stretch obviously gives me a nasty stretched look. I don't care if the image is getting cut off on the top/bottom, I'm just needing it to be put into the nav bar full sized and what shows shows.

我不能只将 nil 传递给调整大小模式.

I can't just pass in nil to the resizing mode.

还有

init(rawValue:)) 

调整大小模式的选项，但我在那里输入的任何数字都会导致背景中不再有图像.

option for the resizing mode, but any number I put in there results in there being no image in the background anymore.

有什么想法吗?

let picture = passedPerson.pictureURL!


         if let imageFromCache = MainPageVC.imageCache.object(forKey: picture as String as NSString) {


                var titleView = UIImageView()
                titleView.contentMode = .scaleAspectFit
              titleView.image = imageFromCache

        self.navigationItem.titleView = titleView  } else {
        print(picture)
        var requested = URLRequest(url: URL(string: picture)!)

        URLSession.shared.dataTask(with: requested) {data, response, err in


            if err != nil {

                print(err?.localizedDescription)
            } else {


                DispatchQueue.main.async {

                    let imageToCache = UIImage(data: data!)

                    MainPageVC.imageCache.setObject(imageToCache!, forKey: picture as String as NSString)

                    var titleView = UIImageView()
                    titleView.contentMode = .scaleAspectFit
                    titleView.image = imageToCache

                    self.navigationItem.titleView = titleView


                  //  UINavigationBar.appearance().setBackgroundImage(imageToCache?.resizableImage(withCapInsets: UIEdgeInsetsMake(0, 0, 0, 0), resizingMode: UIImageResizingMode.stretch), for: .default)
                }

            }

            }.resume()

上面的结果是没有图片显示.

The above results in no picture showing up.

推荐答案

试试这个.希望你会工作

try with this . hope it you will work

UINavigationBar.appearance().setBackgroundImage(imageToCache‌​, forBarMetrics: .Default)

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