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Swift中所有视图控制器的背景图像相同

background image swift

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Eric Chong · 技术社区 · 8 年前

我想为所有视图控制器设置相同的背景图像。以下是我尝试过的:

let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
backgroundImage.image = UIImage(named: "bg_name.png")
backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
self.view.insertSubview(backgroundImage, at: 0)

但这只能通过到处复制粘贴来实现。有什么更好的方法可以做到这一点?

2 回复 | 直到 7 年前

1

2

Chris Edgington 8 年前

如果您的意思是希望在所有视图控制器中具有相同的背景图像,那么一个选项是创建自定义基础 ViewController 类,并让您的所有其他类继承自该类。例如-

class BackgroundImageViewController: ViewController {

 override func viewDidLoad(_animated: Bool) {
    super.viewDidLoad(animated: animated)
    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
    backgroundImage.image = UIImage(named: "bg_name.png")
    backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
    self.view.insertSubview(backgroundImage, at: 0)
  }

}

然后-

class AnotherViewController: BackgroundImageViewController {

  // Your normal view controller stuff

}

2

1

Rodrigo poot may 8 年前

可以创建视图控制器类的扩展

extension UIViewController {

    /// This function sets an image as the background of the view controller
    ///
    /// - Parameters:
    ///   - imageName: name of image
    ///   - contentMode:
    ///          .scaleAspectFill
    ///          .scaleAspectFit
    ///          .scaleToFill
    func setBackgroundImage(_ imageName: String, contentMode: UIViewContentMode) {
        let backgroundImage = UIImageView(frame: self.view.bounds)
        backgroundImage.image = UIImage(named: imageName)
        backgroundImage.contentMode = contentMode
        self.view.insertSubview(backgroundImage, at: 0)
    }

}

在任何UIViewController类中的用法

override func viewDidLoad() {
    super.viewDidLoad()

    self.setBackgroundImage("name_image", contentMode: .scaleAspectFit)
}