尝试制作一个屏幕截图按钮,当按钮被点击时,该按钮会将屏幕截图发送到我的相机卷。Swift 3、Xcode 8、IOS
Swift 3、Xcode 8、IOS: 我似乎不知道我做错了什么,没有显示错误,但当我点击应用程序中的按钮时,什么都没有发生,也没有保存在我的模拟器摄像机卷中 这是我为视图控制器中的按钮所做的:尝试制作一个屏幕截图按钮,当按钮被点击时,该按钮会将屏幕截图发送到我的相机卷。Swift 3、Xcode 8、IOS,ios,swift3,save,screenshot,Ios,Swift3,Save,Screenshot,Swift 3、Xcode 8、IOS: 我似乎不知道我做错了什么,没有显示错误,但当我点击应用程序中的按钮时,什么都没有发生,也没有保存在我的模拟器摄像机卷中 这是我为视图控制器中的按钮所做的: import UIKit class ViewController: ViewController { override func viewDidLoad() { super.viewDidLoad() } override func didReceiveMemoryWarning()
import UIKit
class ViewController: ViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@IBAction func buttonAction(_ sender: UIButton) {
func captureScreen() {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, UIScreen.main.scale)
view.layer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil)
}
}
}
问题是,您已经将截图代码放在
按钮操作
方法名称captureScreen
的嵌套函数中,并且从未调用过该方法,因此不需要添加嵌套方法。因此,只需删除该函数,并将屏幕截图代码直接放在按钮操作方法中。因此,用这个按钮替换您的按钮操作
@IBAction func buttonAction(_ sender: UIButton) {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, UIScreen.main.scale)
view.layer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil)
}
在Swift 3.1中
首先,您需要编辑info.plist文件
然后添加UI按钮:
@IBOutlet weak var shutterButton: UIButton!
@IBAction func shotAction(_ sender: Any) {
guard shutterButton.isEnabled else {
return
}
let takeScreenshotBlock = {
//Render and capture an UIView named view:
self.shutterButton.isHidden = true
UIGraphicsBeginImageContextWithOptions(self.view.frame.size, false, 0.0)
self.view.drawHierarchy(in: self.view.frame, afterScreenUpdates: true)
if let image = UIGraphicsGetImageFromCurrentImageContext() {
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}
UIGraphicsEndImageContext();
self.shutterButton.isHidden = false
DispatchQueue.main.async {
// briefly flash the screen
let flashOverlay = UIView(frame: self.sceneView.frame)
flashOverlay.backgroundColor = UIColor.white
self.sceneView.addSubview(flashOverlay)
UIView.animate(withDuration: 0.25, animations: {
flashOverlay.alpha = 0.0
}, completion: { _ in
flashOverlay.removeFromSuperview()
})
}
}
switch PHPhotoLibrary.authorizationStatus() {
case .authorized:
takeScreenshotBlock()
case .restricted, .denied:
let alertController = UIAlertController(title: "Photo access denied", message: "Please enable Photos Library access for this appliction in Settings > Privacy.", preferredStyle: UIAlertControllerStyle.alert)
let actionOK = UIAlertAction(title: "OK", style: .cancel, handler: nil)
alertController.addAction(actionOK)
present(alertController, animated: true, completion: nil)
case .notDetermined:
PHPhotoLibrary.requestAuthorization({ (status) in
if status == .authorized {
takeScreenshotBlock()
}
})
}
}
“此应用程序已崩溃,因为它试图在没有使用说明的情况下访问隐私敏感数据。此应用程序的Info.plist必须包含一个NSPhotoLibraryUsageDescription密钥,该密钥带有一个字符串值,用于向用户解释应用程序如何使用此数据。(lldb)”@DanielG检查此答案,并在您的Info.plisties中添加隐私照片库,谢谢!:)@DanielG欢迎伴侣:)@NiravD+1非常感谢你,这很有帮助
@IBOutlet weak var shutterButton: UIButton!
@IBAction func shotAction(_ sender: Any) {
guard shutterButton.isEnabled else {
return
}
let takeScreenshotBlock = {
//Render and capture an UIView named view:
self.shutterButton.isHidden = true
UIGraphicsBeginImageContextWithOptions(self.view.frame.size, false, 0.0)
self.view.drawHierarchy(in: self.view.frame, afterScreenUpdates: true)
if let image = UIGraphicsGetImageFromCurrentImageContext() {
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}
UIGraphicsEndImageContext();
self.shutterButton.isHidden = false
DispatchQueue.main.async {
// briefly flash the screen
let flashOverlay = UIView(frame: self.sceneView.frame)
flashOverlay.backgroundColor = UIColor.white
self.sceneView.addSubview(flashOverlay)
UIView.animate(withDuration: 0.25, animations: {
flashOverlay.alpha = 0.0
}, completion: { _ in
flashOverlay.removeFromSuperview()
})
}
}
switch PHPhotoLibrary.authorizationStatus() {
case .authorized:
takeScreenshotBlock()
case .restricted, .denied:
let alertController = UIAlertController(title: "Photo access denied", message: "Please enable Photos Library access for this appliction in Settings > Privacy.", preferredStyle: UIAlertControllerStyle.alert)
let actionOK = UIAlertAction(title: "OK", style: .cancel, handler: nil)
alertController.addAction(actionOK)
present(alertController, animated: true, completion: nil)
case .notDetermined:
PHPhotoLibrary.requestAuthorization({ (status) in
if status == .authorized {
takeScreenshotBlock()
}
})
}
}