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使用 UIImagePickerController/ImagePicker 的 iOS Swift 和 Xamarin 应用程序崩溃

转载 作者:行者123 更新时间:2023-11-30 12:21:18 26 4
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我在 iPhone 6s 上使用 Swift 3 拍照时遇到奇怪的问题。我试图一张接一张地拍摄许多照片,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;

}
}

我的应用程序崩溃了,xcode 说它与设备“失去了连接”。因此,一切都表明存在内存泄漏,并且运行仪器表明,这也表明存在一遍又一遍创建的新线程,但它们永远不会完成。

问题是,我使用非常基本的代码,重用选择器,关闭 View ,这是整个应用程序中唯一的 View 。

更奇怪的是,当我在 iOS 10.3.1 上使用 iPhone 7 或在另一部运行 iOS 10.3.2 的 iPhone 6(不是 +)上时,根本不会发生异常

所以我将 6+ 降级到 10.3.1 并再次遇到异常。我什至换上了iOS 11 Beta,仍然出现异常。

我希望有人至少能给我一些关于发生了什么或为什么发生的解释。

更新

我在 Xamarin Forms PCL 项目中遇到了这种情况,并决定将其全部剥离并编写一个 Swift 版本,以查看问题是否仍然发生。事实证明确实如此。无论如何,在测试 Xamarin 应用程序时,我们遇到了异常。

异常已写入日志文件。内容如下:

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

最佳答案

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/ 的引用

关于使用 UIImagePickerController/ImagePicker 的 iOS Swift 和 Xamarin 应用程序崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44758213/

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