小编Pun*_*any的帖子

我在 Flutter 的 Android 部分得到了这个。

Unsupported Java. 
Your build is currently configured to use Java 17.0.2 and Gradle 7.0.2.

Possible solution:
 - Open Gradle wrapper settings, change `distributionUrl` property to use compatible Gradle version and reload the project

请告知解决方案。我真的很感激你的回答。

我在导航控制器中嵌入了 2 个 ViewController，如下图所示。

每次我滚动浏览表格项目时，导航背景颜色都会随着状态栏背景颜色不断变化。

如何以编程方式设置导航栏和状态栏的背景颜色？

代码：

import UIKit

class TestViewController: UIViewController, UIGestureRecognizerDelegate {

    @IBOutlet weak var tableView: UITableView!
    
    let faqList : [FAQ] = [
        FAQ(title: "Test 1", content: "Answer 1"),
        FAQ(title: "Test 2", content: "Answer 2"),
        FAQ(title: "Test 3", content: "Answer 3"),
        FAQ(title: "Test 4", content: "Answer 4"),
        FAQ(title: "Test 5", content: "Answer 5"),
        FAQ(title: "Test 6", content: "Answer 6"),
        FAQ(title: "Test 7", content: "Answer 7"),
        FAQ(title: "Test 8", content: "Answer 8"),
        FAQ(title: "Test 9", content: "Answer 9"),
        FAQ(title: …

伙计们！我面对的是这个相机版本。它发生在我合并​​我的项目之后。它说没有可用的相机，但当时它运行良好。请看一看！

E/flutter: [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: PlatformException(no_available_camera, No cameras available for taking pictures., null, null)
    #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:582:7)
    #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:159:18)
    <asynchronous suspension>
    #2      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:332:12)
    #3      MethodChannelImagePicker.pickImagePath (package:image_picker_platform_interface/src/method_channel/method_channel_image_picker.dart:62:21)
    #4      MethodChannelImagePicker.pickImage (package:image_picker_platform_interface/src/method_channel/method_channel_image_picker.dart:30:25)
    #5      ImagePicker.getImage (package:image_picker/image_picker.dart:101:21)
    #6      _ImageEvaluationState.getImage (package:PhotoEarn/screens/camera/image_evaluation.dart:201:38)
    #7      _ImageEvaluationState.build.<anonymous closure> (package:PhotoEarn/screens/camera/image_evaluation.dart:1099:33)
    #8      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
    #9      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1111:38)
    #10     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
    #11     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
    #12     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
    #13     BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:259:7)
    #14     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
    #15     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:362:20)
    #16     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
    #17     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
    #18     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
    #19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
    #20     GestureBinding._handlePointerDataPacket …

我的 React Native 项目昨天运行良好。但是今天早上，在我尝试再次运行后，它给了我以下错误：

error node_modules/react-native/Libraries/Components/ScrollView/ScrollView.js: Property body[41] of BlockStatement expected node to be of a type ["Statement"] but instead got "AssignmentExpression". Run CLI with --verbose flag for more details.
TypeError: Property body[41] of BlockStatement expected node to be of a type ["Statement"] but instead got "AssignmentExpression"

不过，我不确定这意味着什么。我该如何解决这个问题？

我无法在 IOS 设备上运行我的 flutter 项目。

这是我在 flutter run 之后得到的。我不明白为什么。请查看下面的错误并告诉我如何解决此问题。

Launching lib/main.dart on iPhone in debug mode...
Automatically signing iOS for device deployment using specified development team
in Xcode project: L24VC6F98D
Running Xcode build...                                                  
Xcode build done.                                            8,2s
Failed to build iOS app
Error output from Xcode build:
?
    2020-09-18 11:56:14.934 xcodebuild[29414:155421] warning:  The file reference
    for "Objective-C/TOCropViewController/Models/TOActivityCroppedImageProvider.h"
    is a member of multiple groups ("TOCropViewController" and
    "TOCropViewController"); this indicates a malformed project.  Only the
    membership in one of the groups will …

我看到这个mounted语法。它是做什么用的？你能给我样品吗？

如何通过在用户完成输入时自动删除该空格来限制用户使用文本字段中的空格？

例如，如果用户输入King of Light，它将KingofLight在他/她离开文本字段后应用。

TextFormField(
                          initialValue: nickname != null
                              ? nickname
                              : current_user.nickname,
                          decoration: InputDecoration(
                            border: new OutlineInputBorder(
                              borderSide: new BorderSide(color: Colors.grey),
                              borderRadius: BorderRadius.circular(6),
                            ),
                            focusedBorder: OutlineInputBorder(
                              borderSide:
                                  BorderSide(color: Colors.grey, width: 1.0),
                              borderRadius: BorderRadius.circular(6),
                            ),
                            enabledBorder: OutlineInputBorder(
                              borderSide:
                                  BorderSide(color: Colors.grey, width: 1.0),
                              borderRadius: BorderRadius.circular(6),
                            ),
                            hintText: 'Empty',
                            hintStyle: TextStyle(
                              color: Colors.grey[400],
                              fontSize: 20,
                              //fontWeight: FontWeight.bold,
                            ),
                          ),
                          style: TextStyle(
                            fontSize: 20,
                            // fontWeight: FontWeight.bold,
                          ),
                          validator: (val) => val.length < 2
                              ? 'Enter a nickname 2+char …

我正在尝试用 Flutter 实现 webview。但我不断收到以下错误

fatal error: module 'webview_flutter_wkwebview' not found

然后我补充道：

<key>io.flutter.embedded_views_preview</key>
    <true/>

仅供参考，我用webview_flutter: ^3.0.0.

但一切都没有改变。这个你能帮我吗。

Flutter & AlertDialog：如何将其对齐到底部？我如何制作 2 个像这张图片一样的警报对话框？请多多关注这张图片。

showDialog(
                                context: context,
                                builder: (BuildContext context) {
                                  double width =
                                      MediaQuery.of(context).size.width;
                                  double height =
                                      MediaQuery.of(context).size.height;
                                  return AlertDialog(
                                    backgroundColor: Colors.transparent,
                                    contentPadding: EdgeInsets.zero,
                                    title: Center(
                                        child: Text("Evaluation our APP")),
                                    content: Container(

                                       // What Should I write here?

                                    )
                                },
                              );

在 android Studio 中选择时Create New Flutter Project，会出现 4 个选项，如下所示。

• Flutter Application
• Flutter Plugin
• Flutter Package
• Flutter Module

所有这些 Flutter 项目类型之间有什么区别

我使用 UILabel 以编程方式创建了一个带有灰色背景的文本。现在我想添加padding到这一段/文本中。另外，如果您能向我展示如何添加margin到我的UILabel中，那就太好了。

import UIKit

final class SignUpViewController: UIViewController {
    
    public let identifier = "Sign Up"
    
    private let logoImage : UIImageView = {
        let imageView = UIImageView()
        imageView.layer.masksToBounds = true
        imageView.contentMode = .scaleAspectFit
        imageView.image = UIImage(named: "MyLogoWithTitle")
        imageView.clipsToBounds = true
        return imageView
    }()
    
    private let instructionText : UILabel = {
        let label = UILabel()
        label.text = "Please read terms and conditions below carefully before proceeding with the registration."
        label.backgroundColor = UIColor().colorFromHex(hex: "#2C333C", opacity: 0.4) …

我正在尝试使用LogarithmsBase a 和 Argument b 使用NumPy.

我已经阅读了文档，NumPy但它看起来很混乱。

我们如何Log_a (b) 使用进行计算NumPy？

谢谢