对于在iOS和Android上略有不同的UI,即在不同的平台上,必须有一种方法来检测应用程序在哪个平台上运行,但我在文档中找不到它。是什么?
当前回答
这个自定义创建的类将帮助您检测平台:
import 'package:flutter/foundation.dart'
show defaultTargetPlatform, kIsWeb, TargetPlatform;
enum Os {
web,
android,
ios,
macOS,
linux,
windows,
fuchsia,
}
class Platform {
const Platform();
/// Platform is Web.
static bool get isWeb => os == Os.web;
/// Platform is Android.
static bool get isAndroid => os == Os.android;
/// Platform is IOS.
static bool get isIOS => os == Os.ios;
/// Platform is Fuchsia.
static bool get isFuchsia => os == Os.fuchsia;
/// Platform is Linux.
static bool get isLinux => os == Os.linux;
/// Platform is MacOS.
static bool get isMacOS => os == Os.macOS;
/// Platform is Windows.
static bool get isWindows => os == Os.windows;
/// Platform is Android or IOS.
static bool get isMobile => isAndroid || isIOS;
/// Platform is Android or IOS or Fuchsia.
static bool get isFullMobile => isMobile || isFuchsia;
/// Platform is Linux or Windows or MacOS.
static bool get isDesktop => isLinux || isWindows || isMacOS;
/// Getting the os name.
static Os get os {
if (kIsWeb) {
return Os.web;
}
switch (defaultTargetPlatform) {
case TargetPlatform.android:
return Os.android;
case TargetPlatform.iOS:
return Os.ios;
case TargetPlatform.macOS:
return Os.macOS;
case TargetPlatform.windows:
return Os.windows;
case TargetPlatform.fuchsia:
return Os.fuchsia;
case TargetPlatform.linux:
return Os.linux;
}
}
}
其他回答
为更简单的方式为网络和应用程序。试试这个
import 'dart:io' show Platform;
import 'package:flutter/foundation.dart' show kIsWeb;
var platformName = '';
if (kIsWeb) {
platformName = "Web";
} else {
if (Platform.isAndroid) {
platformName = "Android";
} else if (Platform.isIOS) {
platformName = "IOS";
} else if (Platform.isFuchsia) {
platformName = "Fuchsia";
} else if (Platform.isLinux) {
platformName = "Linux";
} else if (Platform.isMacOS) {
platformName = "MacOS";
} else if (Platform.isWindows) {
platformName = "Windows";
}
}
print("platformName :- "+platformName.toString());
所以这里有一个小工具,我用来检测平台和操作系统的反应适当。
import'dart:io' show Platform;
import 'package:flutter/foundation.dart' show kIsWeb;
class Util {
os getPlatform() {
if (kIsWeb) {
return os.Web;
} else if (Platform.isIOS) {
return os.IOS;
} else if (Platform.isAndroid) {
return os.Android;
} else if (Platform.isFuchsia) {
return os.Fuchsia;
} else if (Platform.isLinux) {
return os.Linux;
} else if (Platform.isMacOS) {
return os.MacOS;
} else if (Platform.isWindows) {
return os.Windows;
}
return os.Unknown;
}
bool isWeb() {
return (getPlatform()==os.Web);
}
bool isMobile() {
os platform = getPlatform();
return (platform == os.Android || platform == os.IOS || platform== os.Fuchsia);
}
bool isComputer() {
os platform = getPlatform();
return (platform == os.Linux || platform == os.MacOS || platform== os.Windows);
}
}
enum os { Unknown, Web, Android, Fuchsia, IOS, Linux, MacOS, Windows }
import 'dart:io' show Platform; //at the top
String os = Platform.operatingSystem; //in your code
print(os);
if (Platform.isAndroid) {
// Android-specific code/UI Component
} else if (Platform.isIOS) {
// iOS-specific code/UI Component
}
不要忘记导入IO库。
import 'dart:io';
如果你使用导入'dart:html';那么你必须指定平台定义,因为两个库都有“平台”的定义
在这种情况下,使用如下所示的平台特定代码:
import 'dart:io' as IO;
import 'dart:html';
if (IO.Platform.isAndroid) {
// Android-specific code/UI Component
} else if (IO.Platform.isIOS) {
// iOS-specific code/UI Component
}
如果你正在寻找合适的平台集成,我建议在Flutter网站上使用完整的示例: https://flutter.dev/docs/development/platform-integration/platform-channels
你可以这样做
defaultTargetPlatform == TargetPlatform.iOS
? kIOSTheme
: kDefaultTheme,
从导入'包:flutter/foundation.dart';