有点像是和 JS 的交互，Flutter 是通过自定义的 MethodChannel 来做通道
Flutter 中的代码：
//调用原生方法
Future runiOSMethod() async {
const platform = const MethodChannel('lianchu');
var result;
try {
result = await platform.invokeMethod('comeonman');
return Future.value(result);
} on PlatformException catch (e) {
return Future.error(e.toString());
}
}
MethodChannel 对应通道，invokeMethod 对应方法，上面的代码调用了通道‘lianchu’的‘comeonman’方法
iOS 中的代码：
从这里可以直接在 XCode 中打开对应的 iOS 项目
image.png
先为 Flutter 方法创建一个工具类：
FlutterNativePlugin.h:
#import <Foundation/Foundation.h>
#import <Flutter/Flutter.h>
NS_ASSUME_NONNULL_BEGIN
@interface FlutterNativePlugin : NSObject <FlutterPlugin>
@end
NS_ASSUME_NONNULL_END
FlutterNativePlugin.m:
#import "FlutterNativePlugin.h"
@implementation FlutterNativePlugin
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
FlutterMethodChannel *channel = [FlutterMethodChannel methodChannelWithName:@"lianchu" binaryMessenger:[registrar messenger]];
FlutterNativePlugin *instance = [[FlutterNativePlugin alloc]init];
[registrar addMethodCallDelegate:instance channel:channel];
}
- (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result {
if ([call.method isEqualToString:@"comeonman"]) {
result(@"么么哒");
}else {
result(FlutterMethodNotImplemented);
}
}
@end
上面代码找到了 MethodChannel('lianchu') 中的 Method('comeonman')，并返回了一个‘么么哒’
接下来要在 AppDelegate.m 中完成注册
AppDelegate.m：
#include "AppDelegate.h"
#include "GeneratedPluginRegistrant.h"
#import "FlutterNativePlugin.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
[GeneratedPluginRegistrant registerWithRegistry:self];
[FlutterNativePlugin registerWithRegistrar:[self registrarForPlugin:@"FlutterNativePlugin"]];
return [super application:application didFinishLaunchingWithOptions:launchOptions];
}
@end
妥了，在 Flutter 代码中写个按钮调用一下试试效果：
FlatButton(
onPressed: () async {
var futureValue = await runiOSMethod();
return showDialog(
context: context,
builder: (context) {
return AlertDialog(
content: Text(
futureValue,
textAlign: TextAlign.center,
),
);
},
);
},
child: Text(
'我是按钮',
style: TextStyle(fontSize: 12.0),
),
color: Colors.red,
textColor: Colors.white,
)
image.png
