Indeterminate NSProgressIndicator will not animate - objective-c

Question

So I've got a simple UI, A Start button, some text/labels, and a progress bar. When the Start button is click, the NSProgressIndicator should animate. Here's my code:
#synthesize progressBar = progressBar;
/* Some code and setup stuffs... */
- (IBAction)startAction:(id)sender {
NSLog(#"Button clicked.");
NSLog(#"Beginning Socketry and socket creation...");
[progressBar setUsesThreadedAnimation:YES];
[progressBar setIndeterminate:YES];
[progressBar startAnimation:progressBar];
}
I've checked multiple source (Apple Developer Portal, etc.), and nothing works. I don't have to have the NSPIndicator, but it would be really nice if I could.
Also, here's my AppDelegate.h file:
#import <Cocoa/Cocoa.h>
#interface AppDelegate : NSObject <NSApplicationDelegate>
#property (assign) IBOutlet NSWindow *window;
#property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
#property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
#property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
#property (weak) IBOutlet NSProgressIndicator *progressBar;
- (IBAction)saveAction:(id)sender;
- (IBAction)startAction:(id)sender;
- (IBAction)changeStatus:(id)sender;
- (IBAction)changeProgress:(id)sender;
#end

Answer 1

Go to the Attributes Inspector of the Progress Indicator and set up as shown in the picture below:
See code below:
#synthesize progressBar;
- (IBAction)startAction:(id)sender {
[progressBar setHidden:NO];
[progressBar setIndeterminate:YES];
[progressBar setUsesThreadedAnimation:YES];
[progressBar startAnimation:nil];
}