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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = self.viewController;
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic,strong) UILabel *label;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    CGRect labelRect = CGRectMake(50.0f, 50.0f, 100.0f, 70.0f);
    self.label = [[UILabel alloc] initWithFrame:labelRect];
    self.label.text = @"Hello World";
    [self.view addSubview:self.label];
}

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;


@end

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()
@property (nonatomic,strong) ViewController *viewController;
@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.rootViewController = self.viewController;
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}