Question

我使用以下命令创建了我的第一个本机应用程序。

react-native init PropertyFinder

这为 Objective-C 中的ios创建了一个项目。问题是我不知道Objective-C但我在Swift上工作。

这个gist展示了如何将反应组件链接到一个快速项目。但有没有办法直接用 Swift语言创建项目？

Answer 1

这excellent post帮我解决了这个问题。

解决方案

添加桥接标题

#import "RCTBridgeModule.h"
#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
#import "RCTRootView.h"
#import "RCTUtils.h"
#import "RCTConvert.h"

添加AppDelegate.Swift

var bridge: RCTBridge!

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    /**
     * Loading JavaScript code - uncomment the one you want.
     *
     * OPTION 1
     * Load from development server. Start the server from the repository root:
     *
     * $ npm start
     *
     * To run on device, change `localhost` to the IP address of your computer
     * (you can get this by typing `ifconfig` into the terminal and selecting the
     * `inet` value under `en0:`) and make sure your computer and iOS device are
     * on the same Wi-Fi network.
     */

    let jsCodeLocation = NSURL(string: "http://localhost:8081/index.ios.bundle?platform=ios&dev=true")

    /**
     * OPTION 2
     * Load from pre-bundled file on disk. The static bundle is automatically
     * generated by "Bundle React Native code and images" build step.
     */

    // jsCodeLocation = NSBundle.mainBundle().URLForResource("main", withExtension: "jsbundle")

    let rootView = RCTRootView(bundleURL:jsCodeLocation as URL!, moduleName: "PropertyFinder", initialProperties: nil, launchOptions:launchOptions)

    self.bridge = rootView?.bridge

    self.window = UIWindow(frame: UIScreen.main.bounds)
    let rootViewController = UIViewController()

    rootViewController.view = rootView

    self.window!.rootViewController = rootViewController;
    self.window!.makeKeyAndVisible()

    return true
  }

删除AppDelegate.h，AppDelegate.m和主文件。
清洁和建造。

Answer 2

如果您在导入时遇到问题

#import "RCTBridgeModule.h"
#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
#import "RCTRootView.h"
#import "RCTUtils.h"
#import "RCTConvert.h"

试

#import <React/RCTBridgeModule.h>
#import <React/RCTBridge.h>
#import <React/RCTEventDispatcher.h>
#import <React/RCTRootView.h>
#import <React/RCTUtils.h>
#import <React/RCTConvert.h>

Answer 3

这实际上对我有用：

import Foundation

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
  var window: UIWindow?
  var bridge: RCTBridge!

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let jsCodeLocation: URL

    jsCodeLocation = RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index.ios", fallbackResource:nil)
    let rootView = RCTRootView(bundleURL: jsCodeLocation, moduleName: "REPLACE_WITH_YOUR_PROJECT_NAME", initialProperties: nil, launchOptions: launchOptions)
    let rootViewController = UIViewController()
    rootViewController.view = rootView

    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = rootViewController
    self.window?.makeKeyAndVisible()

    return true
  }
}

Answer 4

我调查了它，react-native不支持该功能。

react-native init正在做的是采用模板并更改其中的一些属性。

模板是用Objective-C编写的，因此除了手动修改结果外，你无能为力。

然而，这不应该让你真正关心。即使在Objective-C项目中也可以使用Swift。无需将文件重写为Swift。

Answer 5

1）在Xcode中打开Worksapce项目

2）删除这些文件：

AppDelegate.h
AppDelegate.m
main.m

3）创建一个名为AppDelegate的新Swift文件，接着单击创建桥接头文件

4）复制以下内容到AppDelegate.swift

import Foundation
import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
  var window: UIWindow?
  var bridge: RCTBridge!

  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    let jsCodeLocation: URL

    jsCodeLocation = RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index.ios", fallbackResource:nil)
    let rootView = RCTRootView(bundleURL: jsCodeLocation, moduleName: "REPLACE_WITH_YOUR_PROJECT_NAME", initialProperties: nil, launchOptions: launchOptions)
    let rootViewController = UIViewController()
    rootViewController.view = rootView

    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = rootViewController
    self.window?.makeKeyAndVisible()

    return true
  }
}

5）将以下代码复制到桥接头文件中

#import "React/RCTBridgeModule.h"
#import "React/RCTBridge.h"
#import "React/RCTEventDispatcher.h"
#import "React/RCTRootView.h"
#import "React/RCTUtils.h"
#import "React/RCTConvert.h"
#import "React/RCTBundleURLProvider.h"

6）现在运行您的项目

Answer 6

这对我有用：

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, RCTBridgeDelegate {
    func sourceURL(for bridge: RCTBridge!) -> URL! {
        #if DEBUG
            return RCTBundleURLProvider.sharedSettings().jsBundleURL(forBundleRoot: "index", fallbackResource:nil)
        #else
            return Bundle.main.url(forResource:"main", withExtension:"jsbundle")
        #endif
}

var window: UIWindow?
var bridge: RCTBridge!

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    self.bridge = RCTBridge(delegate: self, launchOptions: launchOptions)

    let rootView = RCTRootView(bridge: self.bridge, moduleName: "SolutoPartnersApp", initialProperties: nil)

    self.window = UIWindow(frame: UIScreen.main.bounds)
    let rootViewController = UIViewController()

    rootViewController.view = rootView

    self.window!.rootViewController = rootViewController;
    self.window!.makeKeyAndVisible()

    return true
}

func applicationWillResignActive(_ application: UIApplication) {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

func applicationDidEnterBackground(_ application: UIApplication) {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

func applicationWillEnterForeground(_ application: UIApplication) {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}

func applicationDidBecomeActive(_ application: UIApplication) {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

func applicationWillTerminate(_ application: UIApplication) {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

}

React Native应用程序纯粹在Swift中

6 个答案: