iOS implementation

Write plugin methods on the iOS side.

iOS implementation

On the iOS side, a plugin is a Swift class implementing the FlutterPlugin protocol. The handle(_ call: FlutterMethodCall) method catches incoming calls from Dart.

class MyPluginiOS: NSObject, FlutterPlugin {
  func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    if call.method == "getVersion" {
      result("1.0")
    } else {
      result(FlutterMethodNotImplemented)
    }
  }
}

Swift and FlutterPlugin

A plugin written in Swift extends NSObject and implements the FlutterPlugin protocol. FlutterMethodCall.method gives the call name; the reply returns to Dart via FlutterResult.

Exercise IOSPlugin simulation

Define a Dart class named IOSPlugin. Its handle(String method) method returns a String: '1.0' if method == 'getVersion', otherwise 'unknown'. In main, create an IOSPlugin instance and print the result of handle('getVersion').

Show example solution

class IOSPlugin {
  String handle(String method) {
    if (method == 'getVersion') {
      return '1.0';
    }
    return 'unknown';
  }
}

void main() {
  final plugin = IOSPlugin();
  print(plugin.handle('getVersion'));
}

Test yourself

Which method catches calls from Dart on the iOS side?
- viewDidLoad
- handle(_ call:)
- onClick
- build
Show answer

handle(_ call:) — The handle(_ call:) method of the FlutterPlugin protocol receives FlutterMethodCalls from Dart; build is for widgets, viewDidLoad for view controllers, and onClick for view events.

Swift method comparison

if call.method == "____" {

Show answer

if call.method == "getVersion" {

iOS implementation matches

iOS

Apple platform
FlutterPlugin

iOS protocol
Swift

iOS programming language
handle

Call capture

Next lesson: Summary - Platform plugin

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