feat(ios): ensure user defined xcconfig always takes priority (#5784)

Author: NathanWalker

lib/definitions/ios.d.ts

@@ -57,7 +57,7 @@ declare global {
 			buildConfig: IBuildConfig
 		): Promise<string[]>;
 		getXcodeProjectArgs(
-			projectRoot: string,
+			platformData: IPlatformData,
 			projectData: IProjectData
 		): string[];
 	}

lib/services/ios/spm-service.ts

@@ -78,7 +78,7 @@ export class SPMService implements ISPMService {
 	) {
 		await this.$xcodebuildCommandService.executeCommand(
 			this.$xcodebuildArgsService
-				.getXcodeProjectArgs(platformData.projectRoot, projectData)
+				.getXcodeProjectArgs(platformData, projectData)
 				.concat([
 					"-destination",
 					"generic/platform=iOS",

lib/services/ios/xcodebuild-args-service.ts

@@ -53,7 +53,7 @@ export class XcodebuildArgsService implements IXcodebuildArgsService {
 				)
 			)
 			.concat(this.getBuildLoggingArgs())
-			.concat(this.getXcodeProjectArgs(platformData.projectRoot, projectData));
+			.concat(this.getXcodeProjectArgs(platformData, projectData));
 
 		return args;
 	}
@@ -78,7 +78,7 @@ export class XcodebuildArgsService implements IXcodebuildArgsService {
 			buildConfig.release ? Configurations.Release : Configurations.Debug,
 			"-allowProvisioningUpdates",
 		]
-			.concat(this.getXcodeProjectArgs(platformData.projectRoot, projectData))
+			.concat(this.getXcodeProjectArgs(platformData, projectData))
 			.concat(architectures)
 			.concat(
 				this.getBuildCommonArgs(
@@ -108,38 +108,43 @@ export class XcodebuildArgsService implements IXcodebuildArgsService {
 	}
 
 	public getXcodeProjectArgs(
-		projectRoot: string,
+		platformData: IPlatformData,
 		projectData: IProjectData
 	): string[] {
 		const xcworkspacePath = path.join(
-			projectRoot,
+			platformData.projectRoot,
 			`${projectData.projectName}.xcworkspace`
 		);
 		// Introduced in Xcode 14+
 		// ref: https://forums.swift.org/t/telling-xcode-14-beta-4-to-trust-build-tool-plugins-programatically/59305/5
 		const skipPackageValidation = "-skipPackagePluginValidation";
 
+		const extraArgs: string[] = [
+			"-scheme",
+			projectData.projectName,
+			skipPackageValidation,
+		];
+
+		const BUILD_SETTINGS_FILE_PATH = path.join(
+			projectData.appResourcesDirectoryPath,
+			platformData.normalizedPlatformName,
+			constants.BUILD_XCCONFIG_FILE_NAME
+		);
+
+		if (this.$fs.exists(BUILD_SETTINGS_FILE_PATH)) {
+			extraArgs.push("-xcconfig");
+			extraArgs.push(BUILD_SETTINGS_FILE_PATH);
+		}
+
 		if (this.$fs.exists(xcworkspacePath)) {
-			return [
-				"-workspace",
-				xcworkspacePath,
-				"-scheme",
-				projectData.projectName,
-				skipPackageValidation,
-			];
+			return ["-workspace", xcworkspacePath, ...extraArgs];
 		}
 
 		const xcodeprojPath = path.join(
-			projectRoot,
+			platformData.projectRoot,
 			`${projectData.projectName}.xcodeproj`
 		);
-		return [
-			"-project",
-			xcodeprojPath,
-			"-scheme",
-			projectData.projectName,
-			skipPackageValidation,
-		];
+		return ["-project", xcodeprojPath, ...extraArgs];
 	}
 
 	private getBuildLoggingArgs(): string[] {