flutter插件开发：分享插件只针对ios平台

在开发flutter应用的时候总会遇到其他插件解决不了的问题，我遇到的问题就是在ios平台分享时候调起的是系统的分享但是，分享栏里面没有我想要的facebook和twitter平台，所以不得已写了一个插件但是只针对ios原生平台，下面介绍一下怎么实现插件的流程。

插件的原理是dart建立一个二进制流来于原生平台进行通信，flutter相当于客户端，ios平台和android平台相当于主机。

一：创建flutter插件工程

1：android平台：

利用android studio 创建一个插件工程，在开发安卓插件的时候一定要打开example项目的android目录右键-> flutter -> open android module in android studio,在国内环境编译此项目的时候可能会出现编译错误的问题，建议在开启VPN的环境下下载对应的依赖，坑会比较少。在对应的地方添加dart代码和java代码

2：Ios平台：

ios平台在写OC代码得时候需要先build一下example工程：flutter build ios这样才能找到插件的原生代码，这一点谨记

SharePlugin.h 

#import @interface SharePlugin : NSObject
@end


SharePlugin.m

#import "SharePlugin.h"
#import "ShareHelper.h"
#import @implementation SharePlugin
+ (void)registerWithRegistrar:(NSObject*)registrar {FlutterMethodChannel* channel = [FlutterMethodChannelmethodChannelWithName:@"share_plugin"binaryMessenger:[registrar messenger]];SharePlugin* instance = [[SharePlugin alloc] init];[registrar addMethodCallDelegate:instance channel:channel];
}- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {if ([@"getPlatformVersion" isEqualToString:call.method]) {result([@"iOS " stringByAppendingString:[[UIDevice currentDevice] systemVersion]]);}// 分享到twitter平台if([@"share" isEqualToString:call.method]) {NSDictionary *arguments = [call arguments];NSString* shareCOntent= arguments[@"content"];NSString* shareUrl = arguments[@"url"];[ShareHelper shareToPlatformType:SLServiceTypeTwitter withContent:shareContent withShareUrl:shareUrl];
// [ShareHelper shareToPlatformType:SLServiceTypeFacebook withContent:shareContent withShareUrl:shareUrl];result(nil);}// 分享到facebook 平台if([@"shareToFacebook" isEqualToString:call.method]) {NSDictionary* arguments = [call arguments];NSString* shareCOntent= arguments[@"content"];NSString* shareUrl = arguments[@"url"];[ShareHelper shareToPlatformType:SLServiceTypeFacebook withContent:shareContent withShareUrl:shareUrl];result(nil);}if([@"shareToSnapchat" isEqualToString:call.method]) {NSDictionary* arguments = [call arguments];NSString* shareCOntent= arguments[@"content"];NSString* shareUrl = arguments[@"url"];[ShareHelper shareToPlatformType:@"com.toyopagroup.picaboo.share" withContent:shareContent withShareUrl:shareUrl];result(nil);}if([@"shareToIns" isEqualToString:call.method]) {NSDictionary* arguments = [call arguments];NSString* shareCOntent= arguments[@"content"];NSString* shareUrl = arguments[@"url"];
// [ShareHelper shareToPlatformType:@"com.burbn.instagram.shareextension" withContent:shareContent withShareUrl:shareUrl];[ShareHelper shareToPlatformType:SLServiceTypeLinkedIn withContent:shareContent withShareUrl:shareUrl];result(nil);}if([@"shareToWeixin" isEqualToString:call.method]) {NSDictionary* arguments = [call arguments];NSString* shareCOntent= arguments[@"content"];NSString* shareUrl = arguments[@"url"];[ShareHelper shareToPlatformType:@"com.tencent.xin.sharetimeline" withContent:shareContent withShareUrl:shareUrl];result(nil);}}@end


 ShareHelper.h

//
// ShareHelper.h
// Pods
//
// Created by 明日虫洞 on 2022/10/8.
//#ifndef ShareHelper_h
#define ShareHelper_h#import @interface ShareHelper : NSObject
+(void)shareToPlatformType:(NSString *)platformType withContent:(NSString *)content withShareUrl:(NSString *)url;@end#endif /* ShareHelper_h */


ShareHelper.m

//
// ShareHelper.m
// Pods-Runner
//
// Created by 明日虫洞 on 2022/10/8.
//#import
#import
#import "ShareHelper.h"
#import "PackageUtil.h"@implementation ShareHelper
+(void)shareToPlatformType:(NSString *)platformType withContent:(NSString *)content withShareUrl:(NSString *)url {if(platformType == nil || platformType.length == 0) {NSLog(@"分享平台字符串不正确");return;}// 检查facebook 平台if([platformType isEqualToString:SLServiceTypeFacebook] && ![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]]) {[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://itunes.apple.com/app/id284882215"]];NSLog(@"UnInstall facebook");return;}// 检查twitter 平台if([platformType isEqualToString:SLServiceTypeTwitter] && ![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"twitter://"]]) {NSLog(@"不可以打开twitter平台");[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://itunes.apple.com/app/id333903271"]];NSLog(@"Uninstall twitter");return;}// 检查instagram 平台 com.burbn.instagram.shareextensionif([platformType isEqualToString:@"com.burbn.instagram.shareextension"] && ![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"instagram://app"]]) {NSLog(@"不能打开Ins平台");[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://itunes.apple.com/app/id389801252"]];return;} else {NSLog(@"可以打开ins");}if([platformType isEqualToString:@"com.toyopagroup.picaboo.share"] && ![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"snapchat://"]]) {NSLog(@"未安装snapchat");[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://itunes.apple.com/app/id447188370"]];return;} else {NSLog(@"可以打开snapchat");}if([platformType isEqualToString:@"com.tencent.xin.sharetimeline"] && ![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"wechat://"]]) {NSLog(@"打不开微信");}// if(![SLComposeViewController isAvailableForServiceType:platformType]) {
// NSLog(@"软件未配置登录信息");
// return;
// }// SLComposeViewController* cvc = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeSinaWeibo];
// NSLog(@"%@",cvc);// [SLComposeViewController]
// SLComposeViewController// 创建服务类型控制器 调起对应app的控制器SLComposeViewController *composeVC = [SLComposeViewController composeViewControllerForServiceType:platformType];NSLog(@"---->>>%@",composeVC);// 分享连接[composeVC addURL:[NSURL URLWithString:url]];// 分享内容[composeVC setInitialText:content];if([[[UIApplication sharedApplication] keyWindow].rootViewController isKindOfClass:[UINavigationController class]]) {UINavigationController *vc = (UINavigationController *)[[UIApplication sharedApplication] keyWindow].rootViewController;[vc pushViewController:composeVC animated:YES];} else {UINavigationController *vc = (UINavigationController *)[[UIApplication sharedApplication] keyWindow].rootViewController;[vc presentViewController:composeVC animated:YES completion:^{NSLog(@"分享完毕");}];}composeVC.completiOnHandler= ^(SLComposeViewControllerResult result) {if(result == SLComposeViewControllerResultDone) {NSLog(@"分享完成");} else if(result == SLComposeViewControllerResultCancelled) {NSLog(@"取消分享");}};}@end

二： 集成到自己的项目里面

在自己的项目里面根目录里面添加一个目录，名字暂定为plugins,将插件的项目整个复制到里面去

然后再pubspec.yaml文件中添加自己写的插件路径：

flutter_ffmpeg: ^0.4.2flutter_linkify: ^5.0.2
# ffmpeg_kit_flutter: ^4.5.1share_plugin:path: plugins/share_plugin

这里注意一下格式哦，至此插件就可以使用了