📜  Flutter-编写IOS特定代码

📅  最后修改于: 2020-12-08 04:44:26             🧑  作者: Mango


访问iOS特定代码与Android平台上的代码相似,不同之处在于它使用iOS特定语言-Objective-C或Swift和iOS SDK。否则,该概念与Android平台的概念相同。

让我们也为iOS平台编写与上一章相同的应用程序。

  • 让我们在Android Studio(macOS)中创建一个新的应用程序flutter_browser_ios_app

  • 按照上一章中的步骤2-6进行操作。

  • 启动XCode,然后单击文件→打开

  • 在我们的flutter项目的ios目录下选择xcode项目。

  • 在“跑步者”→“跑步者路径”下打开AppDelegate.m。它包含以下代码-

#include "AppDelegate.h" 
#include "GeneratedPluginRegistrant.h" 
@implementation AppDelegate 

- (BOOL)application:(UIApplication *)application
   didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
      // [GeneratedPluginRegistrant registerWithRegistry:self];
      // Override point for customization after application launch.
      return [super application:application didFinishLaunchingWithOptions:launchOptions];
   } 
@end
  • 我们添加了一个方法openBrowser来打开具有指定URL的浏览器。它接受单个参数url。

- (void)openBrowser:(NSString *)urlString { 
   NSURL *url = [NSURL URLWithString:urlString]; 
   UIApplication *application = [UIApplication sharedApplication]; 
   [application openURL:url]; 
}
  • 在didFinishLaunchingWithOptions方法中,找到控制器并将其设置在控制器变量中。

FlutterViewController* controller = (FlutterViewController*)self.window.rootViewController;
  • 在didFinishLaunchingWithOptions方法中,将浏览器通道设置为flutterapp.tutorialspoint.com/browse-

FlutterMethodChannel* browserChannel = [
   FlutterMethodChannel methodChannelWithName:
   @"flutterapp.tutorialspoint.com/browser" binaryMessenger:controller];
  • 创建一个变量weakSelf并设置当前类-

__weak typeof(self) weakSelf = self;
  • 现在,实现setMethodCallHandler。通过匹配call.method调用openBrowser。通过调用call.arguments获取URL,并在调用openBrowser时传递它。

[browserChannel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
   if ([@"openBrowser" isEqualToString:call.method]) { 
      NSString *url = call.arguments[@"url"];   
      [weakSelf openBrowser:url]; 
   } else { result(FlutterMethodNotImplemented); } 
}];
  • 完整的代码如下-

#include "AppDelegate.h" 
#include "GeneratedPluginRegistrant.h" 
@implementation AppDelegate 

- (BOOL)application:(UIApplication *)application 
   didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   
   // custom code starts 
   FlutterViewController* controller = (FlutterViewController*)self.window.rootViewController; 
   FlutterMethodChannel* browserChannel = [
      FlutterMethodChannel methodChannelWithName:
      @"flutterapp.tutorialspoint.com /browser" binaryMessenger:controller]; 
   
   __weak typeof(self) weakSelf = self; 
   [browserChannel setMethodCallHandler:^(
      FlutterMethodCall* call, FlutterResult result) { 
      
      if ([@"openBrowser" isEqualToString:call.method]) { 
         NSString *url = call.arguments[@"url"];
         [weakSelf openBrowser:url]; 
      } else { result(FlutterMethodNotImplemented); } 
   }]; 
   // custom code ends 
   [GeneratedPluginRegistrant registerWithRegistry:self]; 
   
   // Override point for customization after application launch. 
   return [super application:application didFinishLaunchingWithOptions:launchOptions]; 
}
- (void)openBrowser:(NSString *)urlString { 
   NSURL *url = [NSURL URLWithString:urlString]; 
   UIApplication *application = [UIApplication sharedApplication]; 
   [application openURL:url]; 
} 
@end
  • 打开项目设置。

  • 转到功能并启用后台模式

  • 添加*背景获取远程通知**

  • 现在,运行该应用程序。它的工作方式类似于Android版本,但将打开Safari浏览器,而不是chrome。