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override func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Runs the default Dart entrypoint with a default Flutter route.
flutterEngine.run();
// Connects plugins with iOS platform code to this app.
GeneratedPluginRegistrant.register(with: self.flutterEngine);
return super.application(application, didFinishLaunchingWithOptions: launchOptions);
}
}<code_end>
In this example, we create a FlutterEngine
object inside a SwiftUI ObservableObject.
We then pass this FlutterEngine into a
ContentView using the environmentObject() property.
<code_start>@import UIKit;
@import Flutter;
@interface AppDelegate : FlutterAppDelegate // More on the FlutterAppDelegate below.
@property (nonatomic,strong) FlutterEngine *flutterEngine;
@end<code_end>
<code_start>// The following library connects plugins with iOS platform code to this app.
#import <FlutterPluginRegistrant/GeneratedPluginRegistrant.h>
#import "AppDelegate.h"
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary<UIApplicationLaunchOptionsKey, id> *)launchOptions {
self.flutterEngine = [[FlutterEngine alloc] initWithName:@"my flutter engine"];
// Runs the default Dart entrypoint with a default Flutter route.
[self.flutterEngine run];
// Connects plugins with iOS platform code to this app.
[GeneratedPluginRegistrant registerWithRegistry:self.flutterEngine];
return [super application:application didFinishLaunchingWithOptions:launchOptions];
}
@end<code_end>
<topic_end>
<topic_start>
Show a FlutterViewController with your FlutterEngine
The following example shows a generic ContentView with a
Button hooked to present a FlutterViewController.
The FlutterViewController constructor takes the pre-warmed
FlutterEngine as an argument. FlutterEngine is passed in
as an EnvironmentObject via flutterDependencies.
<code_start>import SwiftUI
import Flutter
struct ContentView: View {
// Flutter dependencies are passed in an EnvironmentObject.
@EnvironmentObject var flutterDependencies: FlutterDependencies
// Button is created to call the showFlutter function when pressed.
var body: some View {
Button("Show Flutter!") {
showFlutter()
}
}
func showFlutter() {
// Get the RootViewController.
guard
let windowScene = UIApplication.shared.connectedScenes
.first(where: { $0.activationState == .foregroundActive && $0 is UIWindowScene }) as? UIWindowScene,
let window = windowScene.windows.first(where: \.isKeyWindow),
let rootViewController = window.rootViewController
else { return }
// Create the FlutterViewController.
let flutterViewController = FlutterViewController(
engine: flutterDependencies.flutterEngine,
nibName: nil,
bundle: nil)
flutterViewController.modalPresentationStyle = .overCurrentContext
flutterViewController.isViewOpaque = false
rootViewController.present(flutterViewController, animated: true)
}
}<code_end>
The following example shows a generic ViewController with a
UIButton hooked to present a FlutterViewController.
The FlutterViewController uses the FlutterEngine instance
created in the AppDelegate.
<code_start>import UIKit
import Flutter
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Make a button to call the showFlutter function when pressed.
let button = UIButton(type:UIButton.ButtonType.custom)
button.addTarget(self, action: #selector(showFlutter), for: .touchUpInside)
button.setTitle("Show Flutter!", for: UIControl.State.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 showFlutter() {
let flutterEngine = (UIApplication.shared.delegate as! AppDelegate).flutterEngine
let flutterViewController =
FlutterViewController(engine: flutterEngine, nibName: nil, bundle: nil)
present(flutterViewController, animated: true, completion: nil)
}
}<code_end>
The following example shows a generic ViewController with a
UIButton hooked to present a FlutterViewController.
The FlutterViewController uses the FlutterEngine instance
created in the AppDelegate.
<code_start>@import Flutter;
#import "AppDelegate.h"
#import "ViewController.h"
@implementation ViewController