实现通过FlutterBoost销毁engine

example/ios/Runner/AppDelegate.h

@@ -9,7 +9,7 @@
 #import <UIKit/UIKit.h>
 #import <flutter_boost/FlutterBoost.h>
 
-@interface AppDelegate : FLBFlutterAppDelegate <UIApplicationDelegate>
-
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
 @end
 

example/ios/Runner/AppDelegate.m

@@ -19,12 +19,6 @@
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
-    PlatformRouterImp *router = [PlatformRouterImp new];
-    [FlutterBoostPlugin.sharedInstance startFlutterWithPlatform:router
-                                                        onStart:^(FlutterEngine *engine) {
-                                                            
-                                                        }];
-    
     self.window = [[UIWindow alloc] initWithFrame: [UIScreen mainScreen].bounds];
     
     
@@ -35,17 +29,14 @@
     vc.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"hybrid" image:nil tag:0];
    
     
-    FLBFlutterViewContainer *fvc = FLBFlutterViewContainer.new;
-    [fvc setName:@"tab" params:@{}];
+    UIViewController *fvc = UIViewController.new;
+//    [fvc setName:@"tab" params:@{}];
     fvc.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"flutter_tab" image:nil tag:1];
     
     
     UITabBarController *tabVC = [[UITabBarController alloc] init];
     UINavigationController *rvc = [[UINavigationController alloc] initWithRootViewController:tabVC];
     
-   
-    router.navigationController = rvc;
-    
     tabVC.viewControllers = @[vc,fvc];
     
     self.window.rootViewController = rvc;
@@ -57,16 +48,48 @@
     
     
     UIButton *nativeButton = [UIButton buttonWithType:UIButtonTypeCustom];
-    nativeButton.frame = CGRectMake(self.window.frame.size.width * 0.5 - 50, 200, 100, 45);
+    nativeButton.frame = CGRectMake(self.window.frame.size.width * 0.5 - 60, 150, 130, 45);
     nativeButton.backgroundColor = [UIColor redColor];
     [nativeButton setTitle:@"push native" forState:UIControlStateNormal];
     [nativeButton addTarget:self action:@selector(pushNative) forControlEvents:UIControlEventTouchUpInside];
     [self.window addSubview:nativeButton];
     
+    UIButton *startEngine = [UIButton buttonWithType:UIButtonTypeCustom];
+    startEngine.frame = CGRectMake(self.window.frame.size.width * 0.5 - 60, 230, 130, 40);
+    startEngine.backgroundColor = [UIColor redColor];
+    [startEngine setTitle:@"start engine" forState:UIControlStateNormal];
+    [startEngine addTarget:self action:@selector(startFlutter:) forControlEvents:UIControlEventTouchUpInside];
+    [self.window addSubview:startEngine];
+    
+    UIButton *destroyEngine = [UIButton buttonWithType:UIButtonTypeCustom];
+    destroyEngine.frame = CGRectMake(self.window.frame.size.width * 0.5 - 60, 300, 130, 40);
+    destroyEngine.backgroundColor = [UIColor redColor];
+    [destroyEngine setTitle:@"destroy engine" forState:UIControlStateNormal];
+    [destroyEngine addTarget:self action:@selector(destroyFlutter:) forControlEvents:UIControlEventTouchUpInside];
+    [self.window addSubview:destroyEngine];
+    
     
     return YES;
 }
 
+- (void)startFlutter:(id)sender {
+    PlatformRouterImp *router = [PlatformRouterImp new];
+    router.navigationController = (UINavigationController*)self.window.rootViewController;
+    [FlutterBoostPlugin.sharedInstance startFlutterWithPlatform:router
+                                                        onStart:^(FlutterEngine *engine) {
+                                                            
+                                                        }];
+}
+
+- (void)destroyFlutter:(id)sender {
+    
+    //切记：在destroyEngine前务必将所有FlutterViewController及其子类的实例销毁。在这里是FLBFlutterViewContainer。否则会异常;以下是全部步骤
+    //1. 首先通过为所有FlutterPlugin的methodChannel属性设为nil来接触其与FlutterEngine的间接强引用
+    //2. 销毁所有的FlutterViewController实例，来解除其与FlutterEngine的强引用
+    //3. 调用FlutterBoostPlugin.destroyEngine函数来解除与FlutterEngine的强引用
+    [FlutterBoostPlugin.sharedInstance destroyEngine];
+}
+
 - (void)pushNative
 {
     UINavigationController *nvc = (id)self.window.rootViewController;

example/ios/Runner/UIViewControllerDemo.xib

 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>

ios/Classes/Boost/FlutterBoostPlugin.h

@@ -108,4 +108,6 @@
         exts:(NSDictionary *)exts
 onPageFinished:(void (^)(NSDictionary *))resultCallback
   completion:(void (^)(BOOL))completion;
+
+- (void)destroyEngine;
 @end

ios/Classes/Boost/FlutterBoostPlugin.m

@@ -118,8 +118,8 @@
     __weak __typeof__(self) weakSelf = self;
     dispatch_once(&onceToken, ^{
         __strong __typeof__(weakSelf) self = weakSelf;
-        self.factory = FLBFactory.new;
-        self.application = [self->_factory createApplication:platform];
+        FLBFactory *factory = FLBFactory.new;
+        self.application = [factory createApplication:platform];
         [self.application startFlutterWithPlatform:platform
                                        onStart:callback];
     });
@@ -169,4 +169,9 @@
     id<FLBFlutterApplicationInterface> app = [[FlutterBoostPlugin sharedInstance] application];
     [app close:uniqueId result:resultData exts:exts completion:completion];
 }
+
+- (void)destroyEngine{
+    self.methodChannel = nil;
+    self.application = nil;
+}
 @end

ios/Classes/Boost/FlutterBoostPlugin_private.h

@@ -28,7 +28,6 @@
 #import "FlutterBoostPlugin.h"
 @interface FlutterBoostPlugin()
 @property (nonatomic,strong) id<FLBFlutterApplicationInterface> application;
-@property (nonatomic,strong) id<FLBAbstractFactory> factory;
 @property (nonatomic,strong) FlutterMethodChannel *methodChannel;
 @property (nonatomic,copy) NSString *fPageId;
 @property (nonatomic,copy) NSString *fPagename;

ios/Classes/Engine/FLBFlutterEngine.m

@@ -101,11 +101,6 @@
                          arguments:nil];
 }
 
-- (FlutterEngine *)engine
-{
-    return _engine;
-}
-
 - (void)atacheToViewController:(FlutterViewController *)vc
 {
     if(_engine.viewController != vc){
@@ -128,5 +123,15 @@
 //    [self detach];
 }
 
+- (void)dealloc{
+    [self.engine setViewController:nil];
+    [self.engine destroyContext];
+    __weak __typeof__(_engine) weak = _engine;
+    NSLog(@"Retain count is %ld", CFGetRetainCount((__bridge CFTypeRef)weak));
+////    CFRelease((__bridge CFTypeRef)_engine);
+//    _engine = nil;
+//    NSLog(@"after Retain count is %ld", CFGetRetainCount((__bridge CFTypeRef)weak));
+//    NSLog(@"[DEBUG]---dealloc--");
+}
 @end