Fix alternative xcode paths (#542)

This PR allows non standard xcode setups.

##### How to test: 
- change the name of xcode.app in your application directory
- update xcode-select using `xcode-select --switch
${PathToYourXCode}/Contents/Developer`
- run ide

---------

Co-authored-by: Filip <[email protected]>

packages/docs/docs/troubleshooting.md

@@ -81,3 +81,7 @@ Here is what you can try when the extension got stuck on some errors:
 If you need to install an older version of an IDE, you can do so by navigating to the cogwheel menu next to the "install" button in the market place.
 
 <img width="698" alt="download-older-version" src="/img/docs/marketplace_install_older_version.png"/>
+
+### -sec-num- Configureing Alternative Xcode Versions
+
+If you are using alternative Xcode version ( e.g. xcode-beta, ["xcodes"](https://www.xcodes.app/) IDE will only work if xcode-select points to the correct directory to set it up run: `xcode-select --switch ${PathToYourXCode}/Contents/Developer`

packages/vscode-extension/src/devices/preview.ts

@@ -24,7 +24,20 @@ export class Preview implements Disposable {
     );
 
     Logger.debug(`Launch preview ${simControllerBinary} ${this.args}`);
-    const subprocess = exec(simControllerBinary, this.args, { buffer: false });
+
+    let simControllerBinaryEnv: { DYLD_FRAMEWORK_PATH: string } | undefined;
+
+    if (Platform.OS === "macos") {
+      const { stdout } = await exec("xcode-select", ["-p"]);
+      const DYLD_FRAMEWORK_PATH = path.join(stdout, "Library", "PrivateFrameworks");
+      Logger.debug(`Setting DYLD_FRAMEWORK_PATH to ${DYLD_FRAMEWORK_PATH}`);
+      simControllerBinaryEnv = { DYLD_FRAMEWORK_PATH };
+    }
+
+    const subprocess = exec(simControllerBinary, this.args, {
+      buffer: false,
+      env: simControllerBinaryEnv,
+    });
     this.subprocess = subprocess;
 
     return new Promise<string>((resolve, reject) => {