pub/url_launcher/ios/Classes/UrlLauncherPlugin.m

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#import "UrlLauncherPlugin.h"

@implementation UrlLauncherPlugin {
}

- (instancetype)initWithController:(FlutterViewController*)controller {
  self = [super init];
  if (self) {
    FlutterMethodChannel* channel = [FlutterMethodChannel
                                     methodChannelWithName:@"plugins.flutter.io/url_launcher"
                                     binaryMessenger:controller];
    [channel setMethodCallHandler:^(FlutterMethodCall *call,
                                    FlutterResult result) {
      NSString* url = call.arguments;
      if ([@"canLaunch" isEqualToString:call.method]) {
        result(@([self canLaunchURL:url]));
      } else if ([@"launch" isEqualToString:call.method]) {
        [self launchURL:url result:result];
      } else {
        result(FlutterMethodNotImplemented);
      }
    }];
  }
  return self;
}

- (BOOL)canLaunchURL:(NSString*)urlString {
  NSURL* url = [NSURL URLWithString:urlString];
  UIApplication* application = [UIApplication sharedApplication];
  return [application canOpenURL:url];
}

- (void)launchURL:(NSString*)urlString result:(FlutterResult)result {
    NSURL* url = [NSURL URLWithString:urlString];
    UIApplication* application = [UIApplication sharedApplication];

    // Using ifdef as workaround to support running with Xcode 7.0 and sdk version 9
    // where the dynamic check fails.
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_10_0
    [application openURL:url options:@{} completionHandler: ^(BOOL success) {
      [self sendResult:success result:result url:url];
    }];
#else
    [self sendResult:[application openURL:url] result:result url:url];
#endif
}

- (void)sendResult:(BOOL)success result:(FlutterResult)result url:(NSURL*)url {
  if (success) {
    result(nil);
  } else {
    result([FlutterError errorWithCode:@"Error"
                               message:[NSString stringWithFormat:@"Error while launching %@", url]
                               details:nil]);

  }

}

@end