Xcode 10主线程检查器:Cordova相机插件 [英] Xcode 10 Main Thread Checker: Cordova Camera Plugin
问题描述
在iOS13发行之后，我正在使用Cordova测试混合应用程序.启动相机非常慢，并会生成以下内容:
Following iOS13 release, I'm testing a hybrid app using Cordova. Launching the camera is very slow and generates the following:
==================================================================
=================================================================
主线程检查器:在后台线程上调用的UI API:-[UIImagePickerController init]
Main Thread Checker: UI API called on a background thread: -[UIImagePickerController init]
PID:1347，TID:618928，线程名称:(none)，队列名称:com.apple.root.default-qos，QoS:0
PID: 1347, TID: 618928, Thread name: (none), Queue name: com.apple.root.default-qos, QoS: 0
回溯:
4 0x0000000100f1bba0 + [CDVCameraPicker createFromPictureOptions:] + 124
4 0x0000000100f1bba0 +[CDVCameraPicker createFromPictureOptions:] + 124
5 0x0000000100f15d54-[CDVCamera showCameraPicker:withOptions:] + 108
5 0x0000000100f15d54 -[CDVCamera showCameraPicker:withOptions:] + 108
6 0x0000000100f15570 __25- [CDVCamera takePicture:] _ block_invoke_2 + 336
6 0x0000000100f15570 __25-[CDVCamera takePicture:]_block_invoke_2 + 336
7 AVFoundation 0x00000001b76178f8 2BC0C357-314E-3AE8-B006-C28528B87512 + 710904
7 AVFoundation 0x00000001b76178f8 2BC0C357-314E-3AE8-B006-C28528B87512 + 710904
8 TCC 0x00000001b35dfbf8 85A762AF-99DB-3B4C-B24B-09600CC17196 + 7160
8 TCC 0x00000001b35dfbf8 85A762AF-99DB-3B4C-B24B-09600CC17196 + 7160
9 TCC 0x00000001b35e3de4 85A762AF-99DB-3B4C-B24B-09600CC17196 + 24036
9 TCC 0x00000001b35e3de4 85A762AF-99DB-3B4C-B24B-09600CC17196 + 24036
10 libxpc.dylib 0x00000001acfe3804 79A1F1AD-9CB4-3334-91D9-E1ED6B1032A3 + 104452
10 libxpc.dylib 0x00000001acfe3804 79A1F1AD-9CB4-3334-91D9-E1ED6B1032A3 + 104452
11 libxpc.dylib 0x00000001acfd72c4 79A1F1AD-9CB4-3334-91D9-E1ED6B1032A3 + 53956
11 libxpc.dylib 0x00000001acfd72c4 79A1F1AD-9CB4-3334-91D9-E1ED6B1032A3 + 53956
12 libdispatch.dylib 0x000000010109b3b4 _dispatch_client_callout3 + 20
12 libdispatch.dylib 0x000000010109b3b4 _dispatch_client_callout3 + 20
13 libdispatch.dylib 0x00000001010b7000 _dispatch_mach_msg_async_reply_invoke + 392
13 libdispatch.dylib 0x00000001010b7000 _dispatch_mach_msg_async_reply_invoke + 392
14 libdispatch.dylib 0x00000001010ada8c _dispatch_kevent_worker_thread + 1436
14 libdispatch.dylib 0x00000001010ada8c _dispatch_kevent_worker_thread + 1436
15 libsystem_pthread.dylib 0x00000001ad0e6adc _pthread_wqthread + 336
15 libsystem_pthread.dylib 0x00000001ad0e6adc _pthread_wqthread + 336
16 libsystem_pthread.dylib 0x00000001ad0ecc7c start_wqthread + 8
16 libsystem_pthread.dylib 0x00000001ad0ecc7c start_wqthread + 8
Xcode 10.3cordova-plugin-camera版本4.1.0
Xcode 10.3 cordova-plugin-camera version 4.1.0
在iPhone X，iOS13上运行
running on iPhone X, iOS13
最终，相机打开并允许我拍照，但之后UI不能正确显示.我尝试创建一个仅添加了相机插件的全新应用程序，并且发生了同样的事情.
Eventually the camera opens and allows me to take a photo but the UI is not displayed correctly afterwards. I've tried creating a brand new app with only the camera plugin added and the same thing happens.
该如何解决?
推荐答案
似乎需要在UI线程中调用UIImagePickerController.幸运的是，代码已经准备好进行更改！
It would seem that UIImagePickerController needs to be called in the UI Thread. Fortunately, the code is already ready for that change!
只需将cameraPicker初始化部分移至主线程部分:
Just move the cameraPicker init section into the main thread section:
dispatch_async(dispatch_get_main_queue(), ^{
// UI MainThread execution
CDVCameraPicker* cameraPicker = [CDVCameraPicker createFromPictureOptions:pictureOptions];
weakSelf.pickerController = cameraPicker;
cameraPicker.delegate = weakSelf;
cameraPicker.callbackId = command.callbackId;
// we need to capture this state for memory warnings that dealloc this object
cameraPicker.webView = weakSelf.webView;
...
}
D.
这篇关于Xcode 10主线程检查器:Cordova相机插件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
