feat: 添加获取当前 SDK 版本 API。

ios/Alipay.m

@@ -20,6 +20,10 @@ RCT_EXPORT_MODULE()
     self = [super init];
     if (self) {
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleOpenURL:) name:@"RCTOpenURLNotification" object:nil];
+        // 反注释下面代码，可以输出支付宝 SDK 调试信息，便于诊断问题
+        // [AlipaySDK startLogWithBlock:^(NSString* log){
+        //      NSLog(@"%@", log);
+        // }];
     }
     return self;
 }
@@ -80,7 +84,7 @@ RCT_EXPORT_MODULE()
     return NO;
 }
 
-RCT_EXPORT_METHOD(setAlipayScheme:(NSString *)scheme){
+RCT_EXPORT_METHOD(setAlipayScheme:(NSString *)scheme) {
     alipayScheme = scheme;
 }
 
@@ -97,6 +101,10 @@ RCT_EXPORT_METHOD(authInfo:(NSString *)info resolver:(RCTPromiseResolveBlock)res
     }];
 }
 
+RCT_EXPORT_METHOD(getVersion: (RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject) {
+    resolve([[AlipaySDK defaultService] currentVersion]);
+}
+
 /*! 
  * [warn][tid:main][RCTModuleData.mm:68] Module Alipay requires main queue setup since it overrides `init` but doesn't implement `requiresMainQueueSetup`. 
  * In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of.