Fix crash when launching applications on iOS device in debug mode

Fixes NativeScript/nativescript-cli#1362

definitions/mobile.d.ts

@@ -73,6 +73,12 @@ declare module Mobile {
 		 * Available for iOS only - the value of device's 'DeviceColor' property.
 		 */
 		color?: string;
+
+		/**
+		 *  Optional property describing the architecture of the device
+		 *  Available for iOS only - can be "armv7" or "arm64"
+		 */
+		activeArchitecture?: string;
 	}
 
 	interface IDevice {

mobile/ios/ios-device.ts

@@ -54,6 +54,21 @@ export class IOSDevice implements Mobile.IiOSDevice {
 			this.deviceInfo.version = this.getValue("ProductVersion");
 			this.deviceInfo.color = this.getValue("DeviceColor");
 			this.deviceInfo.isTablet = productType && productType.toLowerCase().indexOf("ipad") !== -1;
+
+			productType = productType.toLowerCase().trim();
+			let majorVersionAsString = _.last(productType.split(",")[0]);
+			let majorVersion = parseInt(majorVersionAsString);
+			let isArm64Architecture = false;
+			//https://en.wikipedia.org/wiki/List_of_iOS_devices
+			if (_.startsWith(productType, "iphone")) {
+				isArm64Architecture = majorVersion >= 6;
+			} else if (_.startsWith(productType, "ipad")) {
+				isArm64Architecture = majorVersion >= 4;
+			} else if (_.startsWith(productType, "ipod")) {
+				isArm64Architecture = majorVersion >= 7;
+			}
+
+			this.deviceInfo.activeArchitecture = isArm64Architecture ? "arm64" : "armv7";
 	}
 
 	private static mountImageCallback(dictionary: NodeBuffer, user: NodeBuffer): void {