在iPhone 6s上使用Swift 3拍照时，我遇到了一个奇怪的问题。我试图一个接一个拍多张照片，最终应用程序崩溃了。
使用以下代码：
import UIKit
class WelcomeViewController : UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate
{
var imagePicker: UIImagePickerController!
var photoCount : Int = 0
@IBOutlet weak var photoCountLabel: UILabel!
@IBOutlet weak var memoryUseageLabel: UILabel!
@IBAction func TakePhotoAction(_ sender: Any) {
if (imagePicker == nil)
{
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .camera
}
present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
imagePicker.dismiss(animated: true, completion: nil)
photoCount = photoCount + 1;
photoCountLabel.text = String(photoCount)
}
override func viewDidLoad(){
super.viewDidLoad()
photoCount = 0;
}
}
我发现应用程序崩溃，而xcode表示它已经失去连接＆＃34;与设备。 所以一切都指向内存泄漏，并且正在运行的仪器表明，它也表明有一些新的线程一遍又一遍地创建，它们永远不会完成。
问题是，我使用非常基本的代码，重复使用选择器，解除视图，这是整个应用程序中唯一的视图。
为了让事情变得更加奇怪，当我在iOS 10.3.1上使用我的iPhone 7或在iOS 10.3.2上使用另一部iPhone 6（而不是+）时，根本不会发生异常
所以我将6+降级到10.3.1并再次获得例外。我甚至穿上了iOS 11 Beta，但仍然发生了异常。
我希望有人能至少给我一些关于发生了什么或者为什么的解释。
更新
我在Xamarin Forms PCL项目中遇到过这种情况，并决定将其全部删除并编写Swift版本以查看问题是否仍然存在。事实证明它确实如此。无论如何，在测试Xamarin App时，我们得到了一个例外。
异常被写入日志文件。这是内容：
Error Occurred:
Objective-C exception thrown. Name: NSInvalidArgumentException Reason: *** setObjectForKey: object cannot be nil (key: UIImagePickerControllerOriginalImage)
Native stack trace:
0 CoreFoundation 0x000000018a93eff8 <redacted> + 148
1 libobjc.A.dylib 0x00000001893a0538 objc_exception_throw + 56
2 CoreFoundation 0x000000018a822528 <redacted> + 0
3 PhotoLibrary 0x0000000197b18980 <redacted> + 756
4 PhotoLibrary 0x0000000197b1864c PLNotifyImagePickerOfImageAvailability + 28
5 CameraUI 0x00000001a08e990c <redacted> + 456
6 CameraUI 0x00000001a08e9218 <redacted> + 548
7 UIKit 0x0000000190aa5010 <redacted> + 96
8 UIKit 0x0000000190aa4f90 <redacted> + 80
9 UIKit 0x0000000190a8f504 <redacted> + 440
10 UIKit 0x0000000190aa4874 <redacted> + 576
11 UIKit 0x0000000190aa4390 <redacted> + 2480
12 UIKit 0x0000000190a9f728 <redacted> + 3192
13 UIKit 0x0000000190a7033c <redacted> + 340
14 UIKit 0x000000019126a014 <redacted> + 2400
15 UIKit 0x0000000191264770 <redacted> + 4268
16 UIKit 0x0000000191264a50 <redacted> + 5004
17 UIKit 0x0000000191264a50 <redacted> + 5004
18 UIKit 0x0000000191264b9c <redacted> + 148
19 CoreFoundation 0x000000018a8ed42c <redacted> + 24
20 CoreFoundation 0x000000018a8ecd04 <redacted> + 388
21 CoreFoundation 0x000000018a8ea9a8 <redacted> + 744
22 CoreFoundation 0x000000018a81ada4 CFRunLoopRunSpecific + 424
23 GraphicsServices 0x000000018c284074 GSEventRunModal + 100
24 UIKit 0x0000000190ad5058 UIApplicationMain + 208
25 MyApp_iOS_beta 0x0000000100bcb634 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 340
26 MyApp_iOS_beta 0x000000010050c59c UIKit_UIApplication_Main_string___intptr_intptr + 44
27 MyApp_iOS_beta 0x000000010050c45c UIKit_UIApplication_Main_string___string_string + 172
28 MyApp_iOS_beta 0x0000000100078164 MyApp_iOS_Application_Main_string__ + 212
29 MyApp_iOS_beta 0x00000001011f29f4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 244
30 MyApp_iOS_beta 0x00000001038e504c mono_jit_runtime_invoke + 836
31 MyApp_iOS_beta 0x000000010394f6b4 do_runtime_invoke + 112
32 MyApp_iOS_beta 0x00000001039522dc do_exec_main_checked + 152
33 MyApp_iOS_beta 0x00000001038cea44 mono_jit_exec + 268
34 MyApp_iOS_beta 0x0000000103a02f70 xamarin_main + 2148
35 MyApp_iOS_beta 0x00000001038a5e84 main + 96
36 libdyld.dylib 0x000000018982959c <redacted> + 4
Stack Trace:
at ObjCRuntime.Runtime.ThrowNSException (System.IntPtr ns_exception) [0x00000] in /Users/builder/data/lanes/4691/d2270eec/source/xamarin-macios/src/ObjCRuntime/Runtime.cs:319
at ObjCRuntime.Runtime.throw_ns_exception (System.IntPtr exc) [0x00000] in /Users/builder/data/lanes/4691/d2270eec/source/xamarin-macios/runtime/Delegates.generated.cs:126
at (wrapper native-to-managed) ObjCRuntime.Runtime:throw_ns_exception (intptr)
--- End of stack trace from previous location where exception was thrown ---
at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/4691/d2270eec/source/xamarin-macios/src/UIKit/UIApplication.cs:79
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/4691/d2270eec/source/xamarin-macios/src/UIKit/UIApplication.cs:63
at MyApp.iOS.Application.Main (System.String[] args) [0x00009] in /Users/MyApp/iOS/Main.cs:16
答案 0 :(得分：0)
var image: UIImage? = (info.value(forKey: UIImagePickerControllerOriginalImage) as? UIImage)
使用此键从库中获取原始图像。在原生iOS中
这是Xamarin https://developer.xamarin.com/recipes/ios/media/video_and_photos/choose_a_photo_from_the_gallery/
的参考