如何在Objective-C的AppDelegate中调用Swift编写的AppLinkModule类方法或直接设置其静态变量

Hey there! Since you're new to Objective-C, let's break down exactly how to interact with your Swift-written AppLinkModule from AppDelegate.m—whether you want to call the setLink method or directly set the static appLink variable.

Step 1: Import the Swift Bridge Header #

First, you need to make sure your Objective-C code can see your Swift classes. At the top of your AppDelegate.m file, add the auto-generated Swift bridge header (replace <YourProjectName> with your actual Xcode project name):

#import "<YourProjectName>-Swift.h"

This header is automatically created when you mix Swift and Objective-C in a project, and it lets Objective-C access all your @objc-annotated Swift code.

Option 1: Directly Set the Static appLink Variable #

Your appLink is declared as an @objc static property in Swift, which means Objective-C exposes it as a class-level property with auto-generated getter and setter methods. You can set it directly like this:

// In AppDelegate.m (e.g., inside application:openURL:options:)
[AppLinkModule setAppLink:@"https://your-desired-link.com"];

// If you need to read the value later, use:
NSString *currentLink = [AppLinkModule appLink];

Option 2: Call the setLink Instance Method #

Since setLink is an instance method of AppLinkModule, you'll need to create an instance of the class first, then call the method:

// In AppDelegate.m
AppLinkModule *moduleInstance = [[AppLinkModule alloc] init];
[moduleInstance setLink:@"https://your-desired-link.com"];

Important Fix for Your Bridge File #

Quick heads-up: Your current AppLinkModule.m bridge file has an error for the getLink method. The Swift method uses promise blocks, so you need to match the exact signature in the Objective-C bridge to ensure React Native can resolve the promise correctly:

// Replace your existing RCT_EXTERN_METHOD(getLink) with:
RCT_EXTERN_METHOD(getLink:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject)

Example Use Case in AppDelegate #

Here's how this might look if you're handling deep links in the application:openURL:options: method:

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
    // Extract the full deep link URL
    NSString *deepLink = url.absoluteString;
    
    // Option 1: Set the static variable directly
    [AppLinkModule setAppLink:deepLink];
    
    // OR Option 2: Use the instance method
    // AppLinkModule *module = [[AppLinkModule alloc] init];
    // [module setLink:deepLink];
    
    return YES;
}

内容的提问来源于stack exchange，提问作者SHA