Question

对于我正在制作的应用，我希望用户能够点击图片，使其在应用上全屏显示。然后用户可以单击现在的全屏图像使其成为原始大小。

这可能吗？

任何帮助都会很棒，我只是xcode的初学者，我有兴趣知道如何做到这一点。

Answer 1

这是在单击图像时创建全屏图像（带有黑条以保持纵横比）的代码。

要使用此功能，请将此代码添加到保存图像的ViewController中。

然后，对于要展开的imageView，请选中属性检查器中 userInteractionEnabled 的复选框，然后添加 TapGestureRecognizer 它并将其设置为imageTapped。

@IBAction func imageTapped(sender: UITapGestureRecognizer) {
    let imageView = sender.view as! UIImageView
    let newImageView = UIImageView(image: imageView.image)
    newImageView.frame = UIScreen.main.bounds
    newImageView.backgroundColor = .blackColor()
    newImageView.contentMode = .ScaleAspectFit
    newImageView.userInteractionEnabled = true
    let tap = UITapGestureRecognizer(target: self, action: "dismissFullscreenImage:")
    newImageView.addGestureRecognizer(tap)
    self.view.addSubview(newImageView)
    self.navigationController?.isNavigationBarHidden = true
    self.tabBarController?.tabBar.isHidden = true
}

func dismissFullscreenImage(sender: UITapGestureRecognizer) {
    self.navigationController?.isNavigationBarHidden = false
    self.tabBarController?.tabBar.isHidden = false
    sender.view?.removeFromSuperview()
}

此代码的工作原理是创建一个涵盖其他所有内容的新全屏图像。它有自己的 TapGestureRecognizer ，可以从superView中删除全屏图像（从而揭开原始屏幕）。

Swift 3和4的更新：

@IBAction func imageTapped(_ sender: UITapGestureRecognizer) {
    let imageView = sender.view as! UIImageView
    let newImageView = UIImageView(image: imageView.image)
    newImageView.frame = UIScreen.main.bounds
    newImageView.backgroundColor = .black
    newImageView.contentMode = .scaleAspectFit
    newImageView.isUserInteractionEnabled = true
    let tap = UITapGestureRecognizer(target: self, action: #selector(dismissFullscreenImage))
    newImageView.addGestureRecognizer(tap)
    self.view.addSubview(newImageView)
    self.navigationController?.isNavigationBarHidden = true
    self.tabBarController?.tabBar.isHidden = true
}

@objc func dismissFullscreenImage(_ sender: UITapGestureRecognizer) {
    self.navigationController?.isNavigationBarHidden = false
    self.tabBarController?.tabBar.isHidden = false
    sender.view?.removeFromSuperview()
}

Swift - 如何在单击时全屏显示图像，再次单击时创建原始尺寸？

1 个答案: