如何将 AppDelegate 的引用发送到 Viewcontroller 子类？

Question

我已经继承了一个 viewController 类，像这样......

.h 文件

#import "GADBannerView.h"

@interface ViewController : SPViewController
{
    GADBannerView *bannerView;
}

@property GADBannerView *bannerView;

@end

.m 文件

#import "ViewController.h"
#import "GADBannerView.h"
#import "GADRequest.h"

@implementation ViewController

@synthesize bannerView;

- (void)viewDidLoad {

    [super viewDidLoad];
    // Do any additional setup after loading the view.

    bannerView = [[GADBannerView alloc] initWithFrame:CGRectMake(0,0, 320, 50)];

    // Replace this ad unit ID with your own ad unit ID.
    self.bannerView.adUnitID = @"ca-app-pub-LONG ID HERE";
    self.bannerView.rootViewController = self;

    [self.view addSubview:bannerView];

    GADRequest *request = [GADRequest request];

    // Requests test ads on devices you specify. Your test device ID is printed to the console when
    // an ad request is made.
    request.testDevices = @[ GAD_SIMULATOR_ID, @"SIM ID HERE" ];
    [self.bannerView loadRequest:request];


}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

在我的 AppDelegate 中有这个

 _viewController = [[ViewController alloc] init];


    [_viewController startWithRoot:[Game class] supportHighResolutions:YES doubleOnPad:YES];

    [_window setRootViewController:_viewController];
    [_window makeKeyAndVisible];

一切正常，但我需要能够在 ViewController 子类中放置一个开关，以判断是否设置了 AdMob 广告，这是一个布尔值，将在 plist 中设置，可通过 AppDelegate 访问，所以我需要将 AppDelegate 的引用发送到我的子类 ViewController，这样我就可以执行类似的操作

if ([[appDelegate.coreData objectForKey:@"AdMob"] boolValue] == YES) {
       //Admob setup here
    }

在我的 ViewController 子类中。如何在 ViewController 子类中获取对 AppDelegate 的引用？

Answer 1

#import "AppDelegate.h"
// ...
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];