scene(_ scene: UIScene, continue userActivity: NSUserActivity)在用户单击通用链接后启动应用程序时，不会调用方法。
当用户单击通用链接后，已启动的应用程序再次打开时，它工作正常。示例代码：
func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,
let incomingURL = userActivity.webpageURL,
let components = NSURLComponents(url: incomingURL, resolvingAgainstBaseURL: true),
let path = components.path else {
return
}
let params = components.queryItems ?? [URLQueryItem]()
print("path = \(path)")
print("params = \(params)")
}
我尝试使用application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration，但是当用户单击链接时它永远不会被调用：
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
if let scene = …您如何设置箭头依赖项以使@optics注释实际工作？不会为标有 的数据类生成伴随对象@optics。
如果我没记错的话，这是一个注释处理器，因此应该使用 导入它kapt，但是文档将其用作compile.
在验证表单并将请求从 flutter 发送到服务器后端后：我想将来自服务器的任何潜在错误消息设置为以原始表单显示。最好完全像验证错误。
例如：
Widget build(BuildContext context) {
...
TextFormField(
onFieldSubmitted: (value) => _signIn(),
validator: (input) {
if (input.length < 6)
return 'Your password is too short';
return null;
},
onSaved: (input) => _password = input,
decoration: InputDecoration(
labelText: 'Password',
),
obscureText: true,
)
...
}
Future<void> _signIn() async {
final formState = _formKey.currentState;
if (!formState.validate()) return;
formState.save();
try {
... // do fancy request stuff
} catch (e) {
// this is where I want to set the "validation" …我有一个调用的脚本compile。
try:
code = compile('3 = 3', 'test', 'exec')
except Exception as e:
sys.stderr.write(''.join(traceback.format_exception_only(type(e), e)))
3 = 3 结果是：
File "test", line 1
SyntaxError: can't assign to literal
而3 = 3a实际上打印行
File "test", line 1
3 = 3a
^
SyntaxError: invalid syntax
知道为什么吗？
我正在尝试在 Jetson Nano 上编译 C 代码，但在编译过程中出现此错误。我尝试删除任何出现的 'm -64'，但它似乎是自动添加的。这是 cmd 失败的地方： /usr/bin/gcc-7 -Wall -Wextra -Wconversion -pedantic -Wshadow -m64 -Wfatal-errors -O0 -g -o CMakeFiles/dir/testCCompiler.c.o -c /home/user/dir/CMakeFiles/CMakeTmp/testCCompiler.c
uname -a: Linux jetson-nano 4.9.140-tegra aarch64 aarch64 aarch64 GNU/Linux
gcc-7 -v: Using built-in specs.
COLLECT_GCC=gcc-7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/7/lto-wrapper
Target: aarch64-linux-gnu
gcc version 7.4.0 (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04.1)
CMAKE_C_COMPILER = gcc-7
CMAKE_CXX_COMPILER = g++-7
CXX_COMPILE_FLAGS = "-Wall -Werror -Wextra -Wnon-virtual-dtor -Wconversion -Wold-style-cast -pedantic -Wshadow"
C_COMPILE_FLAGS = "-Wall -Wextra -Wconversion -pedantic -Wshadow"
gcc-7：错误：无法识别的命令行选项“-m64”
使用 aws api 我可以在 us-east-1 而不是其他区域创建一个存储桶，这是为什么？
$ aws s3api create-bucket --bucket snap2web-12 --region us-east-1
{
"Location": "/snap2web-12"
}
19:21:27 durrantm u2018 /home/durrantm/Dropbox/_/Michael/cli_scripts
$ aws s3api create-bucket --bucket snap2web-13 --region us-east-2
An error occurred (IllegalLocationConstraintException) when calling the CreateBucket operation: The unspecified location constraint is incompatible for the region specific endpoint this request was sent to.
19:21:44 durrantm u2018 /home/durrantm/Dropbox/_/Michael/cli_scripts
$ aws s3api create-bucket --bucket snap2web-14 --region us-west-1
An error occurred (IllegalLocationConstraintException) when calling the CreateBucket operation: The unspecified location constraint …I have the situation where one function calls one of several possible functions. This seems like a good place to pass a function as a parameter. In this Quoara answer by Zubkov there are three ways to do this.
int g(int x(int)) { return x(1); }
int g(int (*x)(int)) { return x(1); }
int g(int (&x)(int)) { return x(1); }
...
int f(int n) { return n*2; }
g(f); // all three g's above work the same
When should which …
I have a std::vector<T> vec where consecutive blocks of 3 elements are of interest. For ease of processing, I'd like to extract such elements. Currently, the code looks like:
const T& a = vec[i];
const T& b = vec[i + 1];
const T& c = vec[i + 2];
I'd like to use a structured binding to compress the extraction of a, b, c to a single line.
A simple option would be something along the lines of:
std::tuple<T, …我想在我的 Flutter 应用程序中设置 Spotify API 的 oAuth 身份验证。我选择了 flutter_web_auth 0.1.1 包。到目前为止，我已经设法让用户可以登录到 Spotify。登录后，用户应该被重定向回我的应用程序。那行不通。Spotify 总是将用户重定向到另一个网站，而不是返回到应用程序。用户登录后如何关闭 WebView 并将用户重定向到我的应用程序？
import 'package:flutter/material.dart';
import 'package:flutter_web_auth/flutter_web_auth.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
void initState() {
super.initState();
authenticate();
}
void authenticate() async {
// Present the dialog to the user
final result = await FlutterWebAuth.authenticate(
url:
"https://accounts.spotify.com/de/authorize?client_id=78ca499b2577406ba7c364d1682b4a6c&response_type=code&redirect_uri=https://partyai/callback&scope=user-read-private%20user-read-email&state=34fFs29kd09",
callbackUrlScheme: "https://partyai/callback",
);
// Extract token from resulting url
final token = Uri.parse(result).queryParameters['token'];
print('token');
print(token);
} …我是 React 钩子的新手，但我试图将 auseEffect与 a一起使用useCallback，但遇到了臭名昭著的React Hook "useList" cannot be called inside a callback. React Hooks must be called in a React function component or a custom React Hook function react-hooks/rules-of-hooks错误。
Thie 文件包含 makeRequest：
function useConnections = () => {
const makeRequest = React.useCallback(async (props) => {
// Determine base url, determine headers here
const response = fetch(url, options);
return response;
}
return { makeRequest };
}
这个文件是我的useListProvider：
function useListProvider = () => …