添加Flutter到现有iOS的项目
创建iOS项目
如果你已经有iOS项目，可以直接使用。这里我们先创建一个空的iOS项目来模拟已有的项目，取名叫TestOne
创建Flutter模块
进入你的项目同一层目录，假如你的项目是在...path1/path2/yourApp,那么你应该进入到path2目录中
$ cd ...path1/path2/
$ flutter create -t module my_flutter
复制代码上面的命令会创建一个flutter的项目模块，在flutter文件夹中有一个.ios的隐藏文件夹，里面包裹了Cocoapods 和 Ruby 脚本。
完成后的项目目录是这样的：
将Flutter模块作为依赖添加到主项目
添加Flutter需要使用cocoapods，如果你还没有安装，可以参考这里的详细教程：安装cocoapods
创建Podfile文件
如果你的工程已经使用了Cocoapods，就可以跳过此步骤。 安装完成之后，切换到工程的文件夹下：
cd 工程路径
复制代码初始化pod的环境：
pod init
复制代码此时工程中会出现一个Podfile文件，添加项目依赖的第三方库就在这个文件中配置。
编辑Podfile文件添加最后两行代码：
# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'
target 'TestOne' do
# Uncomment the next line if you're using Swift or would like to use dynamic frameworks
# use_frameworks!
# Pods for TestOne
target 'TestOneTests' do
inherit! :search_paths
# Pods for testing
end
target 'TestOneUITests' do
inherit! :search_paths
# Pods for testing
end
end
#新添加的代码
flutter_application_path = '../my_flutter'
eval（File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')), binding)
复制代码其中flutter_application_path代表你的flutter模块路径。 运行
pod install
复制代码为编译Dart 代码添加build phase
打开iOS项目，选中TARGETTestOne项目的Build Phases选项，点击左上角+号按钮,选择New Run Script Phase,将下面的shell脚本添加到输入框中：
"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build
"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" embed
复制代码如下图所示：
然后需要编译一下项目：Command + B。 如果你遇到了类似的这个问题：
FlutterPluginRegistrant/libFlutterPluginRegistrant.a(GeneratedPluginRegistrant.o)' does not contain bitcode.You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target.for architecture arm64
将EnableBitCode关掉就行，因为目前Flutter目前还不支持BitCode。
在主app中使用FlutterViewController
修改AppDelegate.h继承自FlutterAppDelegate：
#import <UIKit/UIKit.h>
#import <Flutter/Flutter.h>
@interface AppDelegate : FlutterAppDelegate
@end
复制代码修改AppDelegate.m文件：
#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 {
[GeneratedPluginRegistrant registerWithRegistry:self];
return [super application:application didFinishLaunchingWithOptions:launchOptions];
}
@end
复制代码如果你是Swift代码，可以修改AppDelegate.swift这个文件:
import UIKit
import Flutter
import FlutterPluginRegistrant // Only if you have Flutter Plugins.
@UIApplicationMain
class AppDelegate: FlutterAppDelegate {
// Only if you have Flutter plugins.
override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
GeneratedPluginRegistrant.register(with: self);
return super.application(application, didFinishLaunchingWithOptions: launchOptions);
}
}
复制代码但是如果你的delegate已经是继承于别的类的时候，可以通过让你的delegate实现FlutterAppLifeCycleProvider协议：
#import <Flutter/Flutter.h>
#import <UIKit/UIKit.h>
#import <FlutterPluginRegistrant/GeneratedPluginRegistrant.h> // Only if you have Flutter Plugins
@interface AppDelegate : UIResponder <UIApplicationDelegate, FlutterAppLifeCycleProvider>
@property (strong, nonatomic) UIWindow *window;
@end
复制代码然后生命周期方法应该由FlutterPluginAppLifeCycleDelegate来代理：
@implementation AppDelegate
{
FlutterPluginAppLifeCycleDelegate *_lifeCycleDelegate;
}
- (instancetype)init {
if (self = [super init]) {
_lifeCycleDelegate = [[FlutterPluginAppLifeCycleDelegate alloc] init];
}
return self;
}
- (BOOL)application:(UIApplication*)application
didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
[GeneratedPluginRegistrant registerWithRegistry:self]; // Only if you are using Flutter plugins.
return [_lifeCycleDelegate application:application didFinishLaunchingWithOptions:launchOptions];
}
// Returns the key window's rootViewController, if it's a FlutterViewController.
// Otherwise, returns nil.
- (FlutterViewController*)rootFlutterViewController {
UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
if ([viewController isKindOfClass:[FlutterViewController class]]) {
return (FlutterViewController*)viewController;
}
return nil;
}
- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
[super touchesBegan:touches withEvent:event];
// Pass status bar taps to key window Flutter rootViewController.
if (self.rootFlutterViewController != nil) {
[self.rootFlutterViewController handleStatusBarTouches:event];
}
}
- (void)applicationDidEnterBackground:(UIApplication*)application {
[_lifeCycleDelegate applicationDidEnterBackground:application];
}
- (void)applicationWillEnterForeground:(UIApplication*)application {
[_lifeCycleDelegate applicationWillEnterForeground:application];
}
- (void)applicationWillResignActive:(UIApplication*)application {
[_lifeCycleDelegate applicationWillResignActive:application];
}
- (void)applicationDidBecomeActive:(UIApplication*)application {
[_lifeCycleDelegate applicationDidBecomeActive:application];
}
- (void)applicationWillTerminate:(UIApplication*)application {
[_lifeCycleDelegate applicationWillTerminate:application];
}
- (void)application:(UIApplication*)application
didRegisterUserNotificationSettings:(UIUserNotificationSettings*)notificationSettings {
[_lifeCycleDelegate application:application
didRegisterUserNotificationSettings:notificationSettings];
}
- (void)application:(UIApplication*)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken {
[_lifeCycleDelegate application:application
didRegisterForRemoteNotificationsWithDeviceToken:deviceToken];
}
- (void)application:(UIApplication*)application
didReceiveRemoteNotification:(NSDictionary*)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler {
[_lifeCycleDelegate application:application
didReceiveRemoteNotification:userInfo
fetchCompletionHandler:completionHandler];
}
- (BOOL)application:(UIApplication*)application
openURL:(NSURL*)url
options:(NSDictionary<UIApplicationOpenURLOptionsKey, id>*)options {
return [_lifeCycleDelegate application:application openURL:url options:options];
}
- (BOOL)application:(UIApplication*)application handleOpenURL:(NSURL*)url {
return [_lifeCycleDelegate application:application handleOpenURL:url];
}
- (BOOL)application:(UIApplication*)application
openURL:(NSURL*)url
sourceApplication:(NSString*)sourceApplication
annotation:(id)annotation {
return [_lifeCycleDelegate application:application
openURL:url
sourceApplication:sourceApplication
annotation:annotation];
}
- (void)application:(UIApplication*)application
performActionForShortcutItem:(UIApplicationShortcutItem*)shortcutItem
completionHandler:(void (^)(BOOL succeeded))completionHandler NS_AVAILABLE_IOS(9_0) {
[_lifeCycleDelegate application:application
performActionForShortcutItem:shortcutItem
completionHandler:completionHandler];
}
- (void)application:(UIApplication*)application
handleEventsForBackgroundURLSession:(nonnull NSString*)identifier
completionHandler:(nonnull void (^)(void))completionHandler {
[_lifeCycleDelegate application:application
handleEventsForBackgroundURLSession:identifier
completionHandler:completionHandler];
}
- (void)application:(UIApplication*)application
performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler {
[_lifeCycleDelegate application:application performFetchWithCompletionHandler:completionHandler];
}
- (void)addApplicationLifeCycleDelegate:(NSObject<FlutterPlugin>*)delegate {
[_lifeCycleDelegate addDelegate:delegate];
}
@end
复制代码使用FlutterViewController
在ViewController.m中添加测试代码：
#import <Flutter/Flutter.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 {
FlutterViewController* flutterViewController = [[FlutterViewController alloc] init];
[self presentViewController:flutterViewController animated:false completion:nil];
}
@end
复制代码swift版：
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 flutterViewController = FlutterViewController()
self.present(flutterViewController, animated: false, completion: nil)
}
}
复制代码现在运行代码，点击按钮，就能看到一个全屏的Flutter界面在你的app上。 你也可以设置路由跳转的别的组件上：
- Objective-C:
[flutterViewController setInitialRoute:@"route1"];
复制代码- Swift：
flutterViewController.setInitialRoute("route1")
复制代码你可以在展示FlutterViewController之前，在Dart代码中使用SystemNavigator.pop()将其弹出展示栈（就像iOS原生那样）。
例子截图：
点击按钮跳转到flutter页面：
使用热重载的方法
热重载指的是不用重新启动就看到修改后的效果，类似web网页开发时保存就看到效果的方式。 进入flutter模块，执行命令：
$ cd some/path/my_flutter
$ flutter attach
Waiting for a connection from Flutter on iPhone XR...
复制代码接下来在xcode中启动你的app，进入到flutter的页面，此时你应该在控制台（终端）看到如下信息：
|
你可以在my_flutter中编辑Dart code，然后在终端输入r来使用热重载。你也可以在浏览器中输入上面的URL来查看断点、分析内存和其他的调试任务。
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