iOS app 模拟器图片显示不全

在跟着千峰的视频写一个angrybirds
但是自己太水，真的是一步一个坑，自己跳的可爽了，明明是视频怎么教我怎么写的但是，。。。。。

创建精灵，模拟器的大小明明是 480 ＊ 320 我的图片也是 480 ＊ 320但是就是显示不全

 //
//  LoadingScene.m
//  AngryBirds
//
//  Created by lee on 16/1/6.
//  Copyright © 2016年 ltybrp. All rights reserved.
//

#import "LoadingScene.h"

@implementation LoadingScene
+(id) scene{
    CCScene *sc = [CCScene node];
    LoadingScene *ls = [LoadingScene node];
    [sc addChild:ls];
    return sc;
}


-(id) init{

    self  =[ super init];
    if(self){
        CGSize winSize = [[CCDirector sharedDirector] winSize];
        CCSprite *sp = [CCSprite spriteWithFile:@"loading.png"];
        [sp setPosition:ccp(winSize.width/2.0f, winSize.height/2.0f)];
        printf("%f %f\n",winSize.width/2.0f, winSize.height/2.0f);

        [self addChild:sp];

    }
    return self;
}
@end

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    _window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
    _window.rootViewController = [[UIViewController alloc]init];
    _window.backgroundColor = [UIColor blackColor];
    // Override point for customization after application launch.

    if (![CCDirector setDirectorType:kCCDirectorTypeDisplayLink]) {
        [CCDirector setDirectorType:kCCDirectorTypeDefault];
        return NO;
    }
    CCDirector *director = [CCDirector sharedDirector];
    EAGLView *glView = [EAGLView viewWithFrame:self.window.bounds pixelFormat: kEAGLColorFormatRGB565 depthFormat:0];
    [director setOpenGLView:glView];
    [director setDeviceOrientation:kCCDeviceOrientationPortrait];
    [director setAnimationInterval:1.0f/60.0f];
    [director setDisplayFPS:YES];

    RootViewController *rvc = [[RootViewController alloc] init];
    [rvc setView:glView];
    [_window setRootViewController:rvc];
    [rvc release];

    [_window makeKeyAndVisible];

    //First scene
    CCScene *sc = [LoadingScene scene];
    [[CCDirector sharedDirector] runWithScene:sc];

    return YES;
}

(https://img-ask.csdn.net/upload/201601/06/1452070848_2723.png)

主要是可能进行了屏幕的拉伸等 最好用autolayout来控制