iOS上扫描到图片的时候，从扫描界面present 出一个viewcontroller，然后再dismiss返回之后出现白屏！

Question

Xcode 9.1, iOS 11.0.1, EasyAR SDK version 2.1.0:

在官方HelloARSwift项目中，当检测到扫描的图片时，发送一个通知，在Viewcontroller界面present出一个newViewcontroller，从newViewcontroller dismiss之后回到viewcontroller界面会出现白屏，如果对着图片，扫描仍然是正常的，但是界面显示却一直是白屏！求解决。

Answer 1

Hi，

1.有没有相应的log输出？可能更方便了解问题

Comments

我在xcode 9.1,  EasyAR 2.1.0  ,ios 11.0.1版本也遇到这个问题了，跳转原生VC界面再返回之后会出现白屏，但是相机扫描仍然正常，只是有白屏什么都看不到，log如下：
7-12-11 17:44:59.581666+0800 helloar[1108:395624] [DYMTLInitPlatform] platform initialization successful
EasyAR SDK Basic Version 2.1.0
2017-12-11 17:44:59.694137+0800 helloar[1108:395590] refreshPreferences: HangTracerEnabled: 0
2017-12-11 17:44:59.694182+0800 helloar[1108:395590] refreshPreferences: HangTracerDuration: 500
2017-12-11 17:44:59.694193+0800 helloar[1108:395590] refreshPreferences: ActivationLoggingEnabled: 0 ActivationLoggingTaskedOffByDA:0
2017-12-11 17:45:06.532428+0800 helloar[1108:395590] Metal GPU Frame Capture Enabled
2017-12-11 17:45:06.532901+0800 helloar[1108:395590] Metal API Validation Enabled
2017-12-11 17:45:06.571364+0800 helloar[1108:395590] Failed to bind EAGLDrawable: <CAEAGLLayer: 0x1c00338e0> to GL_RENDERBUFFER 1
2017-12-11 17:45:06.571427+0800 helloar[1108:395590] Failed to make complete framebuffer object 8cd6
2017-12-11 17:45:06.580607+0800 helloar[1108:395590] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
2017-12-11 17:45:06.580914+0800 helloar[1108:395590] [MC] Reading from public effective user settings.
load target (true): argame (1)
load target (true): idback (2)
load target (true): argame01 (3)
load target (true): argame02 (4)
load target (true): argame03 (5)
load target (true): MyLogo_logo (6)
load target (true): namecard (7)
UIInterfaceOrientation
UIInterfaceOrientation
close current View
UIInterfaceOrientation
load target (true): argame (8)
load target (true): idback (9)
load target (true): argame01 (10)
load target (true): argame02 (11)
load target (true): argame03 (12)
load target (true): MyLogo_logo (13)
load target (true): namecard (14)

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我不相信这个问题你们会没有遇见过，在扫描识别到图片的地方发送一个通知，在viewcontroller(即扫描的界面) 界面上present 出来一个新的viewcontroller,然后再将这个viewcontroller dismiss掉之后返回扫描的界面，就会出现白屏。