xcode CGContextSaveGState:无效上下文 0x0 错误仅在设备上
声明:本页面是StackOverFlow热门问题的中英对照翻译,遵循CC BY-SA 4.0协议,如果您需要使用它,必须同样遵循CC BY-SA许可,注明原文地址和作者信息,同时你必须将它归于原作者(不是我):StackOverFlow
原文地址: http://stackoverflow.com/questions/32236204/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
CGContextSaveGState: invalid context 0x0 Error only on device
提问by mattgabor
Update: I am using XCode 7 Beta with Swift 2.0
更新:我在 Swift 2.0 中使用 XCode 7 Beta
When I try to run my app on an iPhone I get these 3 errors:
当我尝试在 iPhone 上运行我的应用程序时,我收到以下 3 个错误:
<Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextRestoreGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
When I enable to CG_CONTEXT_SHOW_BACKTRACE variable I get this:
当我启用 CG_CONTEXT_SHOW_BACKTRACE 变量时,我得到了这个:
Backtrace:
<<redacted>+40>
<<redacted>+432>
<<redacted>+144>
<<redacted>+172>
<<redacted>+332>
<<redacted>+112>
<<redacted>+820>
<<redacted>+688>
<<redacted>+356>
<<redacted>+80>
<<redacted>+808>
<<redacted>+344>
<<redacted>+420>
<<redacted>+104>
<<redacted>+284>
<<redacted>+556>
<<redacted>+504>
<<redacted>+1792>
<<redacted>+220>
<<redacted>+284>
<<redacted>+920>
<<redacted>+168>
<<redacted>+184>
<<redacted>+56>
<<redacted>+24>
<<redacted>+540>
<<redacted>+724>
<CFRunLoopRunSpecific+384>
<<redacted>+460>
<UIApplicationMain+204>
<main+164>
I'm not sure how to interpret this, I am not using any CoreGraphics content in my code, and the other similar questions had answers that did not work for me. I understand it can be difficult to help debug without code, but I can't figure out what code is related to this, so if anyone has an idea I can post more code.
我不确定如何解释这一点,我没有在我的代码中使用任何 CoreGraphics 内容,其他类似问题的答案对我不起作用。我知道在没有代码的情况下很难帮助调试,但我无法弄清楚哪些代码与此相关,因此如果有人有想法,我可以发布更多代码。
回答by Mark Krenek
From my experimentation, this seems to be due to defining UIViewControllerBasedStatusBarAppearance
in Info.plist
.
从我的实验来看,这似乎是由于UIViewControllerBasedStatusBarAppearance
在Info.plist
.
It happens on iOS 9 (beta & GM) but not on 8.4.
它发生在 iOS 9(测试版和 GM)上,但不在 8.4 上。
回答by Olie
At @JimRota's suggestion, moving this into an answer, since it was deemed helpful:
在@JimRota 的建议下,将其转化为答案,因为它被认为有帮助:
Had this still in XCode 7 GM, iOS9 GM. But, check it out: Set UIViewControllerBasedStatusBarAppearance
to YES (even though the status bar is hidden, which is why I set it to NO to begin with), and the warnings go away. Crazy!
在 XCode 7 GM、iOS9 GM 中还有这个。但是,检查一下:设置UIViewControllerBasedStatusBarAppearance
为 YES(即使状态栏是隐藏的,这就是我将其设置为 NO 开始的原因),警告就会消失。疯狂的!
I then had to add this to my view controllers to keep the status bar hidden:
然后我不得不将它添加到我的视图控制器中以保持状态栏隐藏:
- (BOOL) prefersStatusBarHidden
{
return YES;
}
For me, all my VCs actually inherit from the ProjectNameViewController
, so that simplified it a bit.
对我来说,我所有的 VC 实际上都继承自ProjectNameViewController
,因此简化了一点。
回答by Logic
from comments given above , this is the real way to fix :
根据上面给出的评论,这是解决问题的真正方法:
UIViewControllerBasedStatusBarAppearance to YES in Info.plist
回答by user3099837
im getting the same thing on the xcode 7 GM release, i think ill simply ignore them since everything works but its pretty annoying even though they have admitted its a bug and just didnt fix it yet. Dev Forum Posting
我在 xcode 7 GM 版本上得到了同样的东西,我认为我不会简单地忽略它们,因为一切正常,但它很烦人,即使他们承认它是一个错误并且只是没有修复它。 开发论坛发帖
回答by Peter Johnson
I am getting this too (including the redacted part) when compiling my project on iOS9 beta5. Its fine when compiling on iOS8.
在 iOS9 beta5 上编译我的项目时,我也得到了这个(包括编辑的部分)。在iOS8上编译时没问题。
It happens right in my App Delegate, before executing any commands from
它发生在我的 App Delegate 中,在执行任何命令之前
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
so it seems more likely to be an iOS beta problem than ours.
所以它似乎比我们的更有可能是 iOS 测试版问题。
回答by madewulf
I had the same type of bug when using non integer values as insets for resizable images, like this:
使用非整数值作为可调整大小的图像的插图时,我遇到了相同类型的错误,如下所示:
UIImage * image = [[UIImage imageNamed:@"pill"]
resizableImageWithCapInsets:UIEdgeInsetsMake(17.5, 17.5, 17.5, 17.5)];
This caused this kind of logs. Using integer values fixed the problem.
这导致了这种日志。使用整数值解决了这个问题。
回答by Lee
I had this error. It was because I created a function and forgot to add a return value.
我有这个错误。那是因为我创建了一个函数,忘记添加返回值。
-(void)doSomething
vs.
对比
-doSomething
ugh.
啊。