修改 >从主线程访问布局引擎后，不得从后台线程执行布局引擎 [英] Modifications to the > layout engine must not be performed from a background thread after it has been accessed from the main thread
问题描述
我刚刚为我的 iPhone 和新的 Xcode 下载了 iOS 13.我想为 iOS 13 测试我的应用程序，但是当我尝试运行我的应用程序时，它会在几秒钟后给我一个错误.错误:
I just downloaded iOS 13 for my iPhone and the new Xcode. I wanted to test my app for iOS 13, but when I try to run my app it will give me a error after a few seconds. Error:
由于未捕获的异常而终止应用'NSInternalInconsistencyException'，原因:'修改布局引擎不能在它之后从后台线程执行已从主线程访问.*** 第一次抛出调用堆栈:(0x191ea9c30 0x191bc40c8 0x192395434 0x19218eb94 0x19218eaa8 0x19218e718 0x1963e6ea8 0x191bbfaf00x198984384 0x19634fe54 0x19898468c 0x198997bf4 0x1988dd3e40x1989083a0 0x198909388 0x191bbc3c0 0x191bb4dbc 0x191bb6de80x191bb6b30 0x191bbcc78) libc++abi.dylib:以未捕获终止NSException 类型的异常
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread.' *** First throw call stack: (0x191ea9c30 0x191bc40c8 0x192395434 0x19218eb94 0x19218eaa8 0x19218e718 0x1963e6ea8 0x191bbfaf0 0x198984384 0x19634fe54 0x19898468c 0x198997bf4 0x1988dd3e4 0x1989083a0 0x198909388 0x191bbc3c0 0x191bb4dbc 0x191bb6de8 0x191bb6b30 0x191bbcc78) libc++abi.dylib: terminating with uncaught exception of type NSException
在 iOS 12 及更低版本中，一切似乎都在工作，我不会收到此错误.有人知道如何修复此错误以及此错误的含义吗?
In iOS 12 and lower everything seems to be working and I won't get this error. Does somebody knows how to fix this error and what this error means?
下载 ID:
func Download_ID() {
let urlString = "https://www.instagram.com/(self.username_String)/?__a=1"
guard let url = URL(string: urlString) else { return }
URLSession.shared.dataTask(with: url) { data, urlResponse, error in
guard let data = data, error == nil, urlResponse != nil else {
print(error)
return
}
do
{
let decoder = JSONDecoder()
let downloadedData_user = try decoder.decode(Website.self, from: data)
DispatchQueue.main.async {
self.profile_img_String = downloadedData_user.graphql.user.profile_pic_url
let Veri = downloadedData_user.graphql.user.is_verified
if Veri == true {
self.Verified!.isHidden = false
}else{
self.Verified!.isHidden = true
}
self.Name!.text = downloadedData_user.graphql.user.full_name
self.username!.text = self.username_String
let url = URL(string: "(self.profile_img_String)")
self.profileImage!.kf.indicatorType = .activity
self.profileImage!.kf.setImage(
with: url,
placeholder: UIImage(named: "image-placeholder.png"),
options: [
.scaleFactor(UIScreen.main.scale),
.transition(.fade(0.4)),
.cacheOriginalImage
])
}
} catch {
print(error)
}
}.resume()
}
堆栈:
Main Thread Checker: UI API called on a background thread: -[UIView setHidden:]
PID: 4437, TID: 1560742, Thread name: (none), Queue name: NSOperationQueue 0x10440d330 (QOS: UNSPECIFIED), QoS: 0
Backtrace:
4 Instagram Profile 0x00000001029c09bc $s17Instagram_Profile21History_TableViewCellC11Download_IDyyFyycfU_y10Foundation4DataVSg_So13NSURLResponseCSgs5Error_pSgtcfU_ + 1612
5 Instagram Profile 0x00000001029c10d4 $s10Foundation4DataVSgSo13NSURLResponseCSgs5Error_pSgIegggg_So6NSDataCSgAGSo7NSErrorCSgIeyByyy_TR + 284
6 CFNetwork 0x0000000195105ffc CFNetServiceBrowserSearchForServices + 95540
7 CFNetwork 0x00000001951168dc _CFHTTPMessageSetResponseProxyURL + 7680
8 Foundation 0x0000000192279c60 A99BF5C7-12EA-3700-8798-6522387A8A89 + 1170528
9 Foundation 0x000000019217b7e8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 129000
10 Foundation 0x000000019227bfbc A99BF5C7-12EA-3700-8798-6522387A8A89 + 1179580
11 Foundation 0x000000019217b464 A99BF5C7-12EA-3700-8798-6522387A8A89 + 128100
12 Foundation 0x000000019227c9e8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 1182184
13 Foundation 0x000000019227c4a8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 1180840
14 libdispatch.dylib 0x00000001042bda48 _dispatch_block_async_invoke2 + 144
15 libdispatch.dylib 0x00000001042af2a8 _dispatch_client_callout + 20
16 libdispatch.dylib 0x00000001042b2084 _dispatch_continuation_pop + 572
17 libdispatch.dylib 0x00000001042b1468 _dispatch_async_redirect_invoke + 628
18 libdispatch.dylib 0x00000001042c0aac _dispatch_root_queue_drain + 356
19 libdispatch.dylib 0x00000001042c1418 _dispatch_worker_thread2 + 144
20 libsystem_pthread.dylib 0x0000000191bb6a60 _pthread_wqthread + 216
21 libsystem_pthread.dylib 0x0000000191bbcc78 start_wqthread + 8
2019-09-24 23:21:24.917645+0200 Instagram Profile[4437:1560742] [reports] Main Thread Checker: UI API called on a background thread: -[UIView setHidden:]
PID: 4437, TID: 1560742, Thread name: (none), Queue name: NSOperationQueue 0x10440d330 (QOS: UNSPECIFIED), QoS: 0
Backtrace:
4 Instagram Profile 0x00000001029c09bc $s17Instagram_Profile21History_TableViewCellC11Download_IDyyFyycfU_y10Foundation4DataVSg_So13NSURLResponseCSgs5Error_pSgtcfU_ + 1612
5 Instagram Profile 0x00000001029c10d4 $s10Foundation4DataVSgSo13NSURLResponseCSgs5Error_pSgIegggg_So6NSDataCSgAGSo7NSErrorCSgIeyByyy_TR + 284
6 CFNetwork 0x0000000195105ffc CFNetServiceBrowserSearchForServices + 95540
7 CFNetwork 0x00000001951168dc _CFHTTPMessageSetResponseProxyURL + 7680
8 Foundation 0x0000000192279c60 A99BF5C7-12EA-3700-8798-6522387A8A89 + 1170528
9 Foundation 0x000000019217b7e8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 129000
10 Foundation 0x000000019227bfbc A99BF5C7-12EA-3700-8798-6522387A8A89 + 1179580
11 Foundation 0x000000019217b464 A99BF5C7-12EA-3700-8798-6522387A8A89 + 128100
12 Foundation 0x000000019227c9e8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 1182184
13 Foundation 0x000000019227c4a8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 1180840
14 libdispatch.dylib 0x00000001042bda48 _dispatch_block_async_invoke2 + 144
15 libdispatch.dylib 0x00000001042af2a8 _dispatch_client_callout + 20
16 libdispatch.dylib 0x00000001042b2084 _dispatch_continuation_pop + 572
17 libdispatch.dylib 0x00000001042b1468 _dispatch_async_redirect_invoke + 628
18 libdispatch.dylib 0x00000001042c0aac _dispatch_root_queue_drain + 356
19 libdispatch.dylib 0x00000001042c1418 _dispatch_worker_thread2 + 144
20 libsystem_pthread.dylib 0x0000000191bb6a60 _pthread_wqthread + 216
21 libsystem_pthread.dylib 0x0000000191bbcc78 start_wqthread + 8
2019-09-24 23:21:25.431565+0200 Instagram Profile[4437:1560883] WF: _userSettingsForUser mobile: {
filterBlacklist = (
);
filterWhitelist = (
);
restrictWeb = 1;
useContentFilter = 0;
useContentFilterOverrides = 0;
whitelistEnabled = 0;
}
2019-09-24 23:21:25.431612+0200 Instagram Profile[4437:1560883] WF: _WebFilterIsActive returning: NO
2019-09-24 23:21:26.084697+0200 Instagram Profile[4437:1560883] WF: _userSettingsForUser mobile: {
filterBlacklist = (
);
filterWhitelist = (
);
restrictWeb = 1;
useContentFilter = 0;
useContentFilterOverrides = 0;
whitelistEnabled = 0;
}
2019-09-24 23:21:26.084745+0200 Instagram Profile[4437:1560883] WF: _WebFilterIsActive returning: NO
2019-09-24 23:21:26.150637+0200 Instagram Profile[4437:1560979] NSURLConnection ordering violation: didFinishLoading to be scheduled before didReceiveResponse
2019-09-24 23:21:30.905067+0200 Instagram Profile[4437:1560742] This application is modifying the autolayout engine from a background thread after the engine was accessed from the main thread. This can lead to engine corruption and weird crashes.
Stack:(
0 Foundation 0x00000001923953a4 A99BF5C7-12EA-3700-8798-6522387A8A89 + 2331556
1 Foundation 0x000000019218eb94 A99BF5C7-12EA-3700-8798-6522387A8A89 + 207764
2 Foundation 0x000000019218eaa8 A99BF5C7-12EA-3700-8798-6522387A8A89 + 207528
3 Foundation 0x000000019218e718 A99BF5C7-12EA-3700-8798-6522387A8A89 + 206616
4 UIKitCore 0x00000001963e6ea8 EBED47E6-6BB2-3119-82CE-CC13EDCA02D6 + 15568552
5 libobjc.A.dylib 0x0000000191bbfaf0 10328337-A06E-370F-8958-6EDDA1F434DC + 6896
6 QuartzCore 0x0000000198984384 18D85F6F-635D-3A6F-BF7D-898A644FDCF5 + 1393540
7 UIKitCore 0x000000019634fe54 EBED47E6-6BB2-3119-82CE-CC13EDCA02D6 + 14949972
8 QuartzCore 0x000000019898468c 18D85F6F-635D-3A6F-BF7D-898A644FDCF5 + 1394316
9 QuartzCore 0x0000000198997bf4 18D85F6F-635D-3A6F-BF7D-898A644FDCF5 + 1473524
10 QuartzCore 0x00000001988dd3e4 18D85F6F-635D-3A6F-BF7D-898A644FDCF5 + 709604
11 QuartzCore 0x00000001989083a0 18D85F6F-635D-3A6F-BF7D-898A644FDCF5 + 885664
12 QuartzCore 0x0000000198909388 18D85F6F-635D-3A6F-BF7D-898A644FDCF5 + 889736
13 libsystem_pthread.dylib 0x0000000191bbc3c0 FEB52688-4D65-3D38-AD50-01B128A74208 + 37824
14 libsystem_pthread.dylib 0x0000000191bb4dbc FEB52688-4D65-3D38-AD50-01B128A74208 + 7612
15 libsystem_pthread.dylib 0x0000000191bb6de8 FEB52688-4D65-3D38-AD50-01B128A74208 + 15848
16 libsystem_pthread.dylib 0x0000000191bb6b30 _pthread_wqthread + 424
17 libsystem_pthread.dylib 0x0000000191bbcc78 start_wqthread + 8
)
2019-09-24 23:21:30.927369+0200 Instagram Profile[4437:1560742] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread.'
*** First throw call stack:
(0x191ea9c30 0x191bc40c8 0x192395434 0x19218eb94 0x19218eaa8 0x19218e718 0x1963e6ea8 0x191bbfaf0 0x198984384 0x19634fe54 0x19898468c 0x198997bf4 0x1988dd3e4 0x1989083a0 0x198909388 0x191bbc3c0 0x191bb4dbc 0x191bb6de8 0x191bb6b30 0x191bbcc78)
libc++abi.dylib: terminating with uncaught exception of type NSException
推荐答案
您的网络获取代码几乎是正确的 - 您正在重新加载主队列上的表，但并未停止活动指示器.
Your network fetch code is almost right - you are reloading the table on the main queue but not stopping the activity indicator.
你只需要在闭包内移动那条线:
You just need to move that line inside the closure:
let downloadedData_user = try decoder.decode(Top_us.self, from: data)
self.Top_Search = downloadedData_user.users
DispatchQueue.main.async {
self.tableView.reloadData()
self.Indicator.stopAnimating()
}
请注意，按照惯例，属性应以小写字母开头，而类应以大写字母开头.两者都应该使用camelCase，所以Top_Search 应该是topSearch，Top_us 应该是TopUsers 和Indicator应该是indicator.
Note that by convention, properties should start with a lower case letter while classes should start with an upper case letter. Both should use camelCase, so Top_Search should be topSearch, Top_us should be TopUsers and Indicator should be indicator.
这篇关于修改 >从主线程访问布局引擎后，不得从后台线程执行布局引擎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！
