Flutter踩坑日记：接入现有iOS项目
之前搞的Flutter版工具链已经弄完了，感兴趣的朋友可以围观下，Android版本dio库（v2.0.14）发送网络请求老是报错，去官方提了issue还没回，于是今天搞一下把Flutter模块接入到已有项目中。
首先Flutter官方已经出了wiki，教大家怎么接入。懒得看官方原文的可以看看这个简易版快速集成，先来看看效果。
一、创建Flutter模块
一般用Flutter或者React Native的团队大部分原因都是因为需要跨平台，所以在已有项目目录的上一级创建Flutter模块，譬如你的工作目录在some/path/MyApp，那么你需要在some/path下执行，这样Flutter可以单独交给一个虚拟团队维护，各自独立。
$ cd some/path/
$ flutter create -t module my_flutter
文件结构如下：
some/path/
my_flutter/
lib/main.dart
.ios/
MyApp/
MyApp.xcodeproj
Podfile
MyApp/
AppDelegate.h
AppDelegate.m (or swift)
二、利用Cocoapods添加依赖
没用过Cocoapods的童鞋可以google搜一下，之前写过很多Cocoapods的文章由于博客主机商跑路都没了，说多了都是泪
1.在Podfile文件加入以下代码：
flutter_application_path = '../my_flutter/'
eval(File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')), binding)
注意my_flutter的路径，因为我们是以xcodeproj文件的上一级创建的，所以需要加../，这个和React Native引入依赖路径是一样的，都需要注意这个问题。
2.执行pod install
注：如果报错
[!] InvalidPodfilefile: No such file or directory @ rb_sysopen - ./my_flutter/.ios/Flutter/podhelper.rb.
需要在my_flutter文件夹下执行以下flutter run，把.ios和.android等flutter配置生成出来。
3.禁用bitcode，设置环境变量
找到你的target，Build Settings->Build Options->Enable Bitcode设置为NO，另外在Preprocessor Macros添加FLUTTER_BUILD_MODE=Debug和FLUTTER_BUILD_MODE=Release，如果还有其他环境需要根据情况选择Debug或Release。
4.添加run script
找到你的target，Build Phases -> + -> New Run Script Phase，并且在bash或zsh配置FLUTTER_ROOT，否则打包会出错找不到flutter。涉及多人开发还需要安装路径位置，否则团队小伙伴每个人的路径不一样。
"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build
"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" embed
注：把这个script放到Target Dependencies phasescript的后面。
5.添加assets资源
官网说需要添加Flutter.framework资源，但是这个Cocoapods已经帮忙引入了，所以就不需要了，如果没有被引入进去那就手动引入下。这里只需要添加flutter_assets就行了，记得选Creat folder references引入方式。Flutter 1.0.0版本路径是my_flutter->build->flutter_assets
6.修改AppDelegate
Objective-C:
AppDelegate.h
#import <UIKit/UIKit.h>
#import <Flutter/Flutter.h>
@interface AppDelegate : FlutterAppDelegate
@property (nonatomic,strong) FlutterEngine *flutterEngine;
@end
AppDelegate.m
#import <FlutterPluginRegistrant/GeneratedPluginRegistrant.h> // Only if you have Flutter Plugins
#include "AppDelegate.h"
@implementation AppDelegate
// This override can be omitted if you do not have any Flutter Plugins.
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.flutterEngine = [[FlutterEngine alloc] initWithName:@"io.flutter" project:nil];
[self.flutterEngine runWithEntrypoint:nil];
[GeneratedPluginRegistrant registerWithRegistry:self.flutterEngine];
return [super application:application didFinishLaunchingWithOptions:launchOptions];
}
@end
Swift:
AppDelegate.swift
import UIKit
import Flutter
import FlutterPluginRegistrant // Only if you have Flutter Plugins.
@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
var flutterEngine : FlutterEngine?;
// Only if you have Flutter plugins.
override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
self.flutterEngine = FlutterEngine(name: "io.flutter", project: nil);
self.flutterEngine?.run(withEntrypoint: nil);
GeneratedPluginRegistrant.register(with: self.flutterEngine);
return super.application(application, didFinishLaunchingWithOptions: launchOptions);
}
}
到这里，我们的Flutter就算已经引入工程了
三、跳转Flutter页面
Objective-C:
ViewController.m
#import <Flutter/Flutter.h>
#import "AppDelegate.h"
#import "ViewController.h"
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self
action:@selector(handleButtonAction)
forControlEvents:UIControlEventTouchUpInside];
[button setTitle:@"Press me" forState:UIControlStateNormal];
[button setBackgroundColor:[UIColor blueColor]];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[self.view addSubview:button];
}
- (void)handleButtonAction {
FlutterEngine *flutterEngine = [(AppDelegate *)[[UIApplication sharedApplication] delegate] flutterEngine];
FlutterViewController *flutterViewController = [[FlutterViewController alloc] initWithEngine:flutterEngine nibName:nil bundle:nil];
[self presentViewController:flutterViewController animated:false completion:nil];
}
@end
Swift:
ViewController.swift
import UIKit
import Flutter
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(type:UIButtonType.custom)
button.addTarget(self, action: #selector(handleButtonAction), for: .touchUpInside)
button.setTitle("Press me", for: UIControlState.normal)
button.frame = CGRect(x: 80.0, y: 210.0, width: 160.0, height: 40.0)
button.backgroundColor = UIColor.blue
self.view.addSubview(button)
}
@objc func handleButtonAction() {
let flutterEngine = (UIApplication.shared.delegate as? AppDelegate)?.flutterEngine;
let flutterViewController = FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)!;
self.present(flutterViewController, animated: false, completion: nil)
}
}
剩下的就是写Flutter页面逻辑了以及Flutter模块需要调用Native API（后面专门写一篇文章）。
写完Flutter页面，如果要跳转到指定页面使用Flutter的路由就可以了
Objective-C:
[flutterViewController setInitialRoute:@"route1"];
Swift:
flutterViewController.setInitialRoute("route1")
四、运行
在my_flutter手动flutter run一下，或者直接开启热加载，然后就可以在原有的iOS项目中用Xcoderun起来了。
$ flutter attach --isolate-filter='debug'
Waiting for a connection from Flutter...
Done.
Syncing files to device... 1.1s
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