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
import 'dart:io' show Platform;
if (Platform.isAndroid) {
// Android-specific code
} else if (Platform.isIOS) {
// iOS-specific code
}else if (Platform.isFuchsia) {
// Fuchsia-specific code
}else if (Platform.isLinux) {
// Linux-specific code
}else if (Platform.isMacOS) {
// MacOS-specific code
}else if (Platform.isWindows) {
// Windows-specific code
}else if (Platform.isWindows) {
// Windows-specific code
}
网络
import 'package:flutter/foundation.dart' show kIsWeb;
if (kIsWeb) {
// running on the web!
} else {
// NOT running on the web! You can check for additional platforms here.
}
其他回答
您可以将这个扩展文件(platform_ext.dart)添加到项目中并调用任何对象
import 'dart:io';
import 'package:flutter/foundation.dart' show kIsWeb;
extension Target on Object {
bool isAndroid() {
return Platform.isAndroid;
}
bool isIOS() {
return Platform.isIOS;
}
bool isLinux() {
return Platform.isLinux;
}
bool isWindows() {
return Platform.isWindows;
}
bool isMacOS() {
return Platform.isMacOS;
}
bool isWeb() {
return kIsWeb;
}
// ···
}
只需导入文件并调用它
import 'platform_ext.dart';
....
@override
Widget build(BuildContext context) {
return isAndroid()? Text("Android"):Text("Not Android");
}
导入io库很简单
import'dart:io' show Platform;
void main(){
if(Platform.isIOS){
return someThing();
}else if(Platform.isAndroid){
return otherThing();
}else if(Platform.isMacOS){
return anotherThing();
}
或者用非常简单的方式
Platform.isIOS ? someThing() : anOther(),
import 'dart:io' as io;
if(io.Platform.isAndroid){
doSomething();
}else {
doSomethingElse();
}
最“扑”的答案如下:
import 'package:flutter/foundation.dart' show TargetPlatform;
//...
if(Theme.of(context).platform == TargetPlatform.android)
//do sth for Android
else if(Theme.of(context).platform == TargetPlatform.iOS)
//do sth else for iOS
else if(Theme.of(context).platform == TargetPlatform.fuchsia)
//even do sth else for Fuchsia OS
import 'dart:io' show Platform;
if (Platform.isAndroid) {
// Android-specific code
} else if (Platform.isIOS) {
// iOS-specific code
}
所有选项包括:
Platform.isAndroid
Platform.isFuchsia
Platform.isIOS
Platform.isLinux
Platform.isMacOS
Platform.isWindows
你也可以使用kIsWeb来检测你是否在web上运行,kIsWeb是一个全局常量,指示应用程序是否被编译为在web上运行:
import 'package:flutter/foundation.dart' show kIsWeb;
if (kIsWeb) {
// running on the web!
} else {
// NOT running on the web! You can check for additional platforms here.
}
平台文档:https://api.flutter.dev/flutter/dart-io/Platform-class.html kIsWeb文档:https://api.flutter.dev/flutter/foundation/kIsWeb-constant.html