下拉箭头不显示

[zhangyuepeng86]

下来箭头不显示，可否用下面代码解决

fileprivate let imageView: UIImageView = {
        let imageView = UIImageView.init()
        if /* Carthage */ let bundle = Bundle.init(identifier: "com.eggswift.CRRefresh") {
            imageView.image = UIImage(named: "refresh_arrow", in: bundle, compatibleWith: nil)
        } else if /* CocoaPods */ let bundle = Bundle.init(identifier: "org.cocoapods.CRRefresh") {
            imageView.image = UIImage(named: "NormalHeader.bundle/images/refresh_arrow", in: bundle, compatibleWith: nil)
        } else /* Manual */ {
            imageView.image = UIImage(named: "refresh_arrow")
        }
        
//        imageView.image = crBundle?.imageFromBundle("refresh_arrow")
        return imageView
    }()