创建一个工具类MTAppHelper

import UIKitfileprivate let isIphone4 = Int(kScreenH) == 480fileprivate let isIphone5 = Int(kScreenH) == 568fileprivate let isIphone6 = Int(kScreenH) == 667fileprivate let isIphonePlus = Int(kScreenH) == 736/// 工具类class MTAppHelper {/// 根据机型获取指定机型的图片////// - returns: 指定手机类型的图片static func fetchLaunchImage() -> UIImage? {    var imageName: String!    if isIphonePlus {        imageName = "Default-736h"    } else if isIphone6 {        imageName = "Default-667h"    } else if isIphone5 {        imageName = "Default-568h@2x~iphone"    } else {        imageName = "Default@2x~iphone"    }    return UIImage(named: imageName)}   }

加载UI时调用方法

showSplashScreenImage();

/// 闪屏图片视图lazy var splashImageView: UIImageView = UIImageView(frame: kScreenBounds)  /// 展示闪屏图片private func showSplashScreenImage() {//使用工具类方法         splashImageView.image = ZSAppHelper.fetchLaunchImage()    UIApplication.shared.keyWindow?.addSubview(splashImageView)}