【发布时间】：2017-04-04 02:40:52
【问题描述】：
这几天我一直在尝试解决这个问题。我在 google 和 stack 中进行了大量搜索，但未能找到有效或有意义的东西。我是 Swift 新手，但有一些编程背景。
目前这部分应用程序拍摄一张照片，将其显示在当前视图控制器（VCPhoto）上，移动到另一个控制器，显示动画视图控制器（VCQScan），然后移动到结果视图控制器（VCResult）。我正在尝试将图像从 VCPhoto 移动到 VCResult。我找到的一个答案是这个
Passing Image to another View Controller (Swift)
在我的代码中，这会在下一个视图控制器中返回一个空值。
VCPhoto {
@IBOutlet var butTakePhoto: UIButton!
@IBOutlet var butSkip: UIButton!
@IBOutlet var scanCatB: UIButton!
@IBOutlet var previewPhoto: UIImageView!
let picker = UIImagePickerController()
override func viewDidLoad() {
super.viewDidLoad()
butTakePhoto.addTarget(self, action: #selector(VCPhoto.buttonPressed(_:)), for: .touchUpInside)
butSkip.addTarget(self, action: #selector(VCPhoto.buttonPressed(_:)), for: .touchUpInside)
scanCatB.addTarget(self, action: #selector(VCPhoto.buttonPressed(_:)), for: .touchUpInside)
picker.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func buttonPressed (_ sender: AnyObject?){
if sender === butTakePhoto {
if UIImagePickerController.isSourceTypeAvailable(.camera) {
picker.allowsEditing = false
picker.sourceType = UIImagePickerControllerSourceType.camera
picker.cameraCaptureMode = .photo
picker.modalPresentationStyle = .fullScreen
present(picker,animated: true,completion: nil)
}
}
if sender === scanCatB {
performSegue(withIdentifier: "sSegue", sender: UIButton.self)
}
if sender === butSkip {
performSegue(withIdentifier: "Result", sender: nil)
}
}
func imagePickerController(
_ picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [String : Any])
{
picker.dismiss(animated: true, completion: nil)
let image = info[UIImagePickerControllerOriginalImage] as? UIImage
previewPhoto.image = image
//butScan.isHidden=false
//butSkip.isHidden=true
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "sSegue" {
let dvc = segue.destination as? VCQScan
dvc?.newImage = previewPhoto.image
}
VCScan {
@IBOutlet var catScanImage: UIImageView!
@IBOutlet weak var browsingImage: UIImageView!
var newImage: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
browsingImage.image = newImage
Timer.scheduledTimer(timeInterval: 4.0, target: self, selector: #selector(catScan), userInfo: nil, repeats: false)
catScanImage.animationImages = [
UIImage(named: "catPerc0.png")!,
UIImage(named: "catPerc1.png")!,
UIImage(named: "catPerc2.png")!,
UIImage(named: "catPerc3.png")!,
UIImage(named: "catPerc4.png")!
]
catScanImage.animationDuration = 0.4
catScanImage.startAnimating()
// Do any additional setup after loading the view, typically from a nib.
}
func catScan() {
self.performSegue(withIdentifier: "lastSegue", sender: self)
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "lastSegue" {
let dvc = segue.destination as! VCResult
dvc.newImage = browsingImage.image
}
}
}
上面的prepare for segue正在尝试将它移动到下一个VC，但它没有走那么远，它就出错了
browsingImage.image = newImage
在 VCQScan 中，它似乎没有移动图像，即使我可以在 VCPhoto 的调试器中看到它...感谢您的帮助！！！！希望这是足够的信息，如果不让我知道！再说一次，我是 Swift 和 Xcode 的新手，所以我可能会错过一些非常愚蠢的东西......
调试器输出 2017-04-03 20:08:33.637110-0700 OatQuizApp [3314:1066322 [OatQuizApp.VCResult buttonPressed:]：无法识别的选择器发送到实例 0x100b1fdb0 2017-04-03 20:08:33.638569-0700 OatQuizApp[3314:1066322] * 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[OatQuizApp.VCResult buttonPressed:]：无法识别的选择器发送到实例 0x100b1fdb0 ' * 首先抛出调用栈： （0x18ca7efd8 0x18b4e0538 0x18ca85ef4 0x18ca82f4c 0x18c97ed2c 0x192be30ec 0x192be306c 0x192bcd5e0 0x192be2950 0x192be246c 0x192bdd804 0x192bae418 0x1933a7f64 0x1933a26c0 0x1933a2aec 0x18ca2d424 0x18ca2cd94 0x18ca2a9a0 0x18c95ad94 0x18e3c4074 0x192c13130 0x1000cf900 0x18b96959c） libc++abi.dylib：以 NSException 类型的未捕获异常终止
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