我刚刚下载了最新的XCode(7.1测试版),并开始玩iOS9。
我有一个完美的应用程序在iOS8中没有错误,但现在我从UITableViewCell类中覆盖drawRect方法得到以下错误:
“此应用程序正在从后台线程修改自动布局引擎,这可能导致引擎损坏和奇怪的崩溃。这将在将来的版本中导致异常。”
这是回溯:
Stack:(
0 CoreFoundation 0x000000010a749f65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000109dcfdeb objc_exception_throw + 48
2 CoreFoundation 0x000000010a749e9d +[NSException raise:format:] + 205
3 Foundation 0x0000000109b442e5 _AssertAutolayoutOnMainThreadOnly + 79
4 Foundation 0x00000001099a4ece -[NSISEngine withBehaviors:performModifications:] + 31
5 UIKit 0x000000010b9d425b -[UIView(AdditionalLayoutSupport) _withAutomaticEngineOptimizationDisabledIfEngineExists:] + 58
6 UIKit 0x000000010b9d4d9e -[UIView(AdditionalLayoutSupport) updateConstraintsIfNeeded] + 254
7 UIKit 0x000000010b702760 -[UITableViewCellContentView updateConstraintsIfNeeded] + 185
8 UIKit 0x000000010b9d5ab3 -[UIView(AdditionalLayoutSupport) _updateConstraintsAtEngineLevelIfNeeded] + 272
9 UIKit 0x000000010b1e6274 -[UIView(Hierarchy) _updateConstraintsAsNecessaryAndApplyLayoutFromEngine] + 159
10 UIKit 0x000000010b1f5d84 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 710
11 QuartzCore 0x000000010ae1059a -[CALayer layoutSublayers] + 146
12 QuartzCore 0x000000010ae04e70 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
13 QuartzCore 0x000000010ae04cee _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
14 QuartzCore 0x000000010adf9475 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277
15 QuartzCore 0x000000010ae26c0a _ZN2CA11Transaction6commitEv + 486
16 QuartzCore 0x000000010ae2737c _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92
17 CoreFoundation 0x000000010a675967 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
18 CoreFoundation 0x000000010a6758d7 __CFRunLoopDoObservers + 391
19 CoreFoundation 0x000000010a66ae4c CFRunLoopRunSpecific + 524
20 CoreFoundation 0x000000010a71e011 CFRunLoopRun + 97
21 SDWebImage 0x000000010971773c -[SDWebImageDownloaderOperation start] + 1868
22 Foundation 0x0000000109961e47 __NSOQSchedule_f + 194
23 libdispatch.dylib 0x000000010d93849b _dispatch_client_callout + 8
24 libdispatch.dylib 0x000000010d91e8ec _dispatch_queue_drain + 2215
25 libdispatch.dylib 0x000000010d91de0d _dispatch_queue_invoke + 601
26 libdispatch.dylib 0x000000010d920a56 _dispatch_root_queue_drain + 1420
27 libdispatch.dylib 0x000000010d9204c5 _dispatch_worker_thread3 + 111
28 libsystem_pthread.dylib 0x000000010dc80a9d _pthread_wqthread + 729
29 libsystem_pthread.dylib 0x000000010dc7e3dd start_wqthread + 13
)
这是drawRect方法:
override func drawRect(rect: CGRect) {
super.drawRect(rect)
let cellRect = rect
// Values
let buttonBoxX = CELL_MARGIN + CELL_MARGIN/2
let buttonBoxY = cellRect.height - buttonBoxHeight
let buttonBoxWidth = rect.width - CELL_MARGIN * 3
// Set Button Box
let buttonBoxRect = CGRectMake(buttonBoxX, buttonBoxY, buttonBoxWidth, buttonBoxHeight )
let buttonBox = UIBezierPath(roundedRect: buttonBoxRect, byRoundingCorners: [.BottomRight, .BottomLeft], cornerRadii: CGSize(width: CORNER_RADIUS, height: CORNER_RADIUS)) // Create the path
UIColor.whiteColor().setFill() // Set the Fill to be white
buttonBox.fill()
}
我的理解(参见this question)是复杂的计算等应该在后台线程和主线程上的UI更新,因为UI不是线程安全的。
但是,如果我使用以下内容:
override func drawRect(rect: CGRect) {
super.drawRect(rect)
let cellRect = rect
// Values
let buttonBoxX = CELL_MARGIN + CELL_MARGIN/2
let buttonBoxY = cellRect.height - buttonBoxHeight
let buttonBoxWidth = rect.width - CELL_MARGIN * 3
// Set Button Box
let buttonBoxRect = CGRectMake(buttonBoxX, buttonBoxY, buttonBoxWidth, buttonBoxHeight )
let buttonBox = UIBezierPath(roundedRect: buttonBoxRect, byRoundingCorners: [.BottomRight, .BottomLeft], cornerRadii: CGSize(width: CORNER_RADIUS, height: CORNER_RADIUS)) // Create the path
UIColor.whiteColor().setFill() // Set the Fill to be white
dispatch_async(dispatch_get_main_queue(), {
buttonBox.fill()
})
}
我现在收到一个CGContext错误......
<Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextSetFlatness: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextAddPath: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextDrawPath: 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.
<Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextSetFlatness: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextAddPath: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
<Error>: CGContextDrawPath: 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.
有什么建议吗?
解决方案: 好。这是交易。我正在异步地将图像加载到UIImageView中,但不是在主线程的UI中“绘制”它,而是在后台线程上。此外;在将图像添加到UI后,我在UITableViewCell上调用setNeedsDisplay,从而再次调用drawRect方法......但这次是在后台线程上。
答案 0 :(得分:22)
您注意到的第一个错误看起来与您的drawRect:
代码无关。你的drawRect:
看起来不错。它没有做任何特别复杂的事情。如果你的路径更复杂,你可能想要缓存它,但它可能很好。您更有可能尝试在后台线程上的其他位置修改UI。它可能只会在您覆盖drawRect:
时弹出,因为它会更改UI更新的发生方式(没有自定义drawRect:
,系统可能会应用简单的转换)。您需要在后台线程中查找您正在进行UIKit调用的位置。
如果有疑问,如果它以UI
开头,您可能无法在后台线程上使用它。这不完全正确(您可以在后台线程上创建UIBezierPath
,甚至可以将其绘制到非屏幕上下文中),但作为第一个近似值,它是一个很好的选择。
这段代码不正确:
dispatch_async(dispatch_get_main_queue(), {
buttonBox.fill()
})
对drawRect:
的调用最好已经在主队列上 (因此调度到主队列没有帮助)。如果不是,请参见上文。到这个块执行时,绘制周期结束了,所以没有任何上下文可以进入。
答案 1 :(得分:2)
基本上This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release
表示不应更新UI,尤其是非UI线程中的autolayout相关部分。修复使用dispatch_async(dispatch_get_main_queue()) { // your code }
或
斯威夫特3:
DispatchQueue.main.async {
buttonBox.fill()
}
答案 2 :(得分:0)