Add iOS

ios/React/Promise.swift

@@ -0,0 +1,65 @@
+//
+//  Promise.swift
+//  Cuvent
+//
+//  Created by Marc Rousavy on 14.01.21.
+//  Copyright © 2021 Facebook. All rights reserved.
+//
+
+import Foundation
+
+/**
+ * Represents a JavaScript Promise instance. `reject()` and `resolve()` should only be called once.
+ */
+class Promise {
+  private let resolver: RCTPromiseResolveBlock
+  private let rejecter: RCTPromiseRejectBlock
+
+  init(resolver: @escaping RCTPromiseResolveBlock, rejecter: @escaping RCTPromiseRejectBlock) {
+    self.resolver = resolver
+    self.rejecter = rejecter
+  }
+
+  func reject(error: CameraError, cause: NSError?) {
+    rejecter(error.code, error.message, cause)
+  }
+
+  func reject(error: CameraError) {
+    reject(error: error, cause: nil)
+  }
+
+  func resolve(_ value: Any?) {
+    resolver(value)
+  }
+
+  func resolve() {
+    resolve(nil)
+  }
+}
+
+/**
+ * Wrap a block with an automatic promise resolver and rejecter.
+ *
+ * The value returned by the `block` must be serializable by the React Native bridge, or `nil`.
+ * The error thrown by the `block` should be a `CameraError`
+ */
+func withPromise(_ promise: Promise, _ block: () throws -> Any?) {
+  do {
+    let result = try block()
+    promise.resolve(result)
+  } catch let error as CameraError {
+    promise.reject(error: error)
+  } catch let error as NSError {
+    promise.reject(error: CameraError.unknown(message: error.localizedDescription), cause: error)
+  }
+}
+
+/**
+ * Wrap a block with an automatic promise resolver and rejecter.
+ *
+ * The value returned by the `block` must be serializable by the React Native bridge, or `nil`.
+ * The error thrown by the `block` should be a `CameraError`
+ */
+func withPromise(resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock, _ block: () throws -> Any?) {
+  return withPromise(Promise(resolver: resolve, rejecter: reject), block)
+}