Replace Preferences view. Removed LaunchAtLoginController and replaced with simpler code

ZeroTier One/PreferencesViewController.m

@@ -0,0 +1,102 @@
+//
+//  PreferencesViewController.m
+//  ZeroTier One
+//
+//  Created by Grant Limberg on 8/7/16.
+//  Copyright © 2016 ZeroTier, Inc. All rights reserved.
+//
+
+#import "PreferencesViewController.h"
+
+@interface PreferencesViewController ()
+
+@end
+
+@implementation PreferencesViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+
+    if([self isLaunchAtStartup]) {
+        self.startupCheckBox.state = NSOnState;
+    }
+    else {
+        self.startupCheckBox.state = NSOffState;
+    }
+}
+
+- (IBAction)onStartupCheckBoxChanged:(NSButton *)sender
+{
+    if(sender.state == NSOnState) {
+        [self setLaunchAtLoginEnabled:YES];
+    }
+    else {
+        [self setLaunchAtLoginEnabled:NO];
+    }
+
+}
+
+- (void)setLaunchAtLoginEnabled:(BOOL)enabled
+{
+     LSSharedFileListRef loginItemsRef = LSSharedFileListCreate(NULL, kLSSharedFileListSessionLoginItems, NULL);
+
+    if (enabled) {
+        // Add the app to the LoginItems list.
+        CFURLRef appUrl = (__bridge CFURLRef)[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]];
+        LSSharedFileListItemRef itemRef = LSSharedFileListInsertItemURL(loginItemsRef, kLSSharedFileListItemLast, NULL, NULL, appUrl, NULL, NULL);
+        if (itemRef) CFRelease(itemRef);
+    }
+    else {
+        // Remove the app from the LoginItems list.
+        LSSharedFileListItemRef itemRef = [self itemRefInLoginItems];
+        LSSharedFileListItemRemove(loginItemsRef,itemRef);
+        if (itemRef != nil) CFRelease(itemRef);
+    }
+}
+
+
+- (BOOL)isLaunchAtStartup {
+    // See if the app is currently in LoginItems.
+    LSSharedFileListItemRef itemRef = [self itemRefInLoginItems];
+    // Store away that boolean.
+    BOOL isInList = itemRef != nil;
+    // Release the reference if it exists.
+    if (itemRef != nil) CFRelease(itemRef);
+
+    return isInList;
+}
+
+- (LSSharedFileListItemRef)itemRefInLoginItems {
+    LSSharedFileListItemRef itemRef = nil;
+
+    NSString * appPath = [[NSBundle mainBundle] bundlePath];
+
+    // This will retrieve the path for the application
+    // For example, /Applications/test.app
+    CFURLRef url = (__bridge CFURLRef)[NSURL fileURLWithPath:appPath];
+
+    // Create a reference to the shared file list.
+    LSSharedFileListRef loginItems = LSSharedFileListCreate(NULL, kLSSharedFileListSessionLoginItems, NULL);
+
+    if (loginItems) {
+        UInt32 seedValue;
+        //Retrieve the list of Login Items and cast them to
+        // a NSArray so that it will be easier to iterate.
+        NSArray  *loginItemsArray = (__bridge NSArray *)LSSharedFileListCopySnapshot(loginItems, &seedValue);
+        for(int i = 0; i< [loginItemsArray count]; i++){
+            LSSharedFileListItemRef currentItemRef = (__bridge LSSharedFileListItemRef)[loginItemsArray
+                                                                                        objectAtIndex:i];
+            //Resolve the item with URL
+            if (LSSharedFileListItemResolve(currentItemRef, 0, (CFURLRef*) &url, NULL) == noErr) {
+                NSString * urlPath = [(__bridge NSURL*)url path];
+                if ([urlPath compare:appPath] == NSOrderedSame){
+                    itemRef = currentItemRef;
+                }
+            }
+        }
+    }    
+    CFRelease(loginItems);
+    return itemRef;
+}
+
+@end