如何用iOS代码获取APP启动页图片

//
// AppleSystemService.swift
// Swift-Animations
//
// Created by YouXianMing on 16/8/11.
// Copyright © 2016年 YouXianMing. All rights reserved.
//

import UIKit

class AppleSystemService : NSObject {
 
 /**
  Get the lauch image.
  
  - returns: The lauch image.
  */
 class func launchImage() -> UIImage {
  
  var lauchImage  : UIImage!
  var viewOrientation : String!
  let viewSize  = UIScreen.mainScreen().bounds.size
  let orientation  = UIApplication.sharedApplication().statusBarOrientation
  
  if orientation == .LandscapeLeft || orientation == .LandscapeRight {
   
   viewOrientation = "Landscape"
   
  } else {
   
   viewOrientation = "Portrait"
  }
  
  let imagesInfoArray = NSBundle.mainBundle().infoDictionary!["UILaunchImages"]
  for dict : Dictionary  in imagesInfoArray as! Array {
   
   let imageSize = CGSizeFromString(dict["UILaunchImageSize"]!)
   if CGSizeEqualToSize(imageSize, viewSize) && viewOrientation == dict["UILaunchImageOrientation"]! as String {
    
    lauchImage = UIImage(named: dict["UILaunchImageName"]!)
   }
  }
  
  return lauchImage
 }
}

//
// AppleSystemService.h
// AppleSystemService
//
// Created by YouXianMing on 16/7/2.
// Copyright © 2016年 YouXianMing. All rights reserved.
//

#import 
#import 

@interface AppleSystemService : NSObject

/**
 * Get the lauch image.
 *
 * @return The lauch image.
 */
+ (UIImage *)launchImage;

@end



//
// AppleSystemService.m
// AppleSystemService
//
// Created by YouXianMing on 16/7/2.
// Copyright © 2016年 YouXianMing. All rights reserved.
//

#import "AppleSystemService.h"

@implementation AppleSystemService

+ (UIImage *)launchImage {

 UIImage    *lauchImage  = nil;
 NSString    *viewOrientation = nil;
 CGSize     viewSize  = [UIScreen mainScreen].bounds.size;
 UIInterfaceOrientation orientation  = [[UIApplication sharedApplication] statusBarOrientation];
 
 if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight) {
  
  viewOrientation = @"Landscape";
  
 } else {
 
  viewOrientation = @"Portrait";
 }
 
 NSArray *imagesDictionary = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
 for (NSDictionary *dict in imagesDictionary) {
  
  CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);
  if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]]) {
  
   lauchImage = [UIImage imageNamed:dict[@"UILaunchImageName"]];
  }
 }

 return lauchImage;
}

@end

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