我有一个应用程序,当它检测到没有用户操作时显示屏幕保护程序。目前,它正在工作,因为屏幕保护程序的图像被预加载到应用程序中。
但最终我希望屏幕保护程序访问并显示照片中的图像,因为我们会将促销图像保存到照片中,这些图像会经常更改。
我陷入困境,不知道如何继续访问和阅读照片中的图像。
请帮忙。 :(
import UIKit
import Photos
class ScreenSaverViewController: UIViewController {
@IBOutlet weak var ssImage: UIImageView!
var timer = Timer()
var count = 0
var arrayPhoto: [UIImage] = [
UIImage(named:"0.jpg")!,
UIImage(named:"1.jpg")!,
UIImage(named:"2.jpg")!,
UIImage(named:"3.jpg")!
]
var images = [PHAsset]()
func nextImage() {
let currentIndex = arrayPhoto.index(of: ssImage.image ?? UIImage()) ?? -1
var nextIndex = currentIndex + 1
nextIndex = arrayPhoto.indices.contains(nextIndex) ? nextIndex : 0
UIView.transition(with: ssImage, duration: 0.5, options: .transitionCrossDissolve, animations: { self.ssImage.image = self.arrayPhoto[nextIndex] }, completion: nil)
}
func scheduledTimer(){
timer = Timer.scheduledTimer(timeInterval: 5, target: self, selector: (#selector(nextImage)), userInfo: nil, repeats: true)
count = 1
}
override func viewDidLoad() {
super.viewDidLoad()
if count == 0 {
ssImage.image = UIImage(named: "0.jpg")
}
scheduledTimer()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
timer.invalidate()
self.dismiss(animated: true, completed: nil)
}
}
答案 0 :(得分:2)
您可以直接使用Photos框架。我建议您先阅读文档:https://developer.apple.com/documentation/photos
无论如何,要获得图像,你可以这样做:
func getImages() {
let assets = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: nil)
assets.enumerateObjects({ (object, count, stop) in
self.images.append(object)
})
//In order to get latest image first, we just reverse the array
images.reverse()
}
致谢:Swift 3: Load photos from Photos/Camera Roll without using UIImagePickerController
答案 1 :(得分:0)
我认为您应该在应用中提供一个按钮,点击该按钮将打开UIImagePickerController
来源类型.photos
。应用程序的用户可以选择他希望应包含在屏幕保护程序中的图像。
实施协议UIImagePickerController
&amp; UINavigationControllerDelegate
,尤其是您可以访问所选图片的函数func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
。然后,您可以将这些图像保存到应用程序的“文档”文件夹中,并在显示屏幕保护程序时使用它们。