ios 初始界面自定义rootviewcontroller

#import "AppDelegate.h"
#import "rootViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate


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

rootviewcontroller.png