/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

  The iOS-specific implementation of the application delegate. See AAPLAppDelegate for implementation shared between platforms. Uses NSProgress to display a loading UI while the app loads its assets.

 */

#import "AAPLAppDelegateIOS.h"

#import "AAPLSceneView.h"

#import "AAPLViewController.h"

@implementation AAPLAppDelegateIOS {

    UIProgressView *_progressView;

}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;

{

    if ([keyPath isEqualToString:@"fractionCompleted"]) {

        double fraction = ((NSProgress *)object).fractionCompleted;

        dispatch_async(dispatch_get_main_queue(), ^{

            _progressView.progress = fraction;

        });

    } else {

        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];

    }

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    AAPLViewController *rootViewController = [[AAPLViewController alloc] init];

    application.statusBarHidden = YES;

    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    self.window.backgroundColor = [UIColor purpleColor];

    self.window.rootViewController = rootViewController;

    self.scnView = rootViewController.sceneView;

    [self.window makeKeyAndVisible];

    _progressView = [[UIProgressView alloc] initWithFrame:CGRectInset(self.scnView.bounds, 40, 40)];

    [self.scnView addSubview:_progressView];

    NSProgress *prepareProgress = [NSProgress progressWithTotalUnitCount:1];

    [prepareProgress addObserver:self forKeyPath:@"fractionCompleted" options:NSKeyValueObservingOptionNew context:NULL];

    [prepareProgress becomeCurrentWithPendingUnitCount:1];

    [self commonApplicationDidFinishLaunchingWithCompletionHandler:^{

        [prepareProgress removeObserver:self forKeyPath:@"fractionCompleted"];

        [_progressView removeFromSuperview];

        _progressView = nil;

    }];

    [prepareProgress resignCurrent];

    return YES;

}

@end