为什么自定义放大动画时, 第一个tab没法默认放大呀?

[hubin97]

class RAMScaleAnimation: RAMItemAnimation {

var normalImage: UIImage?
var selectImage: UIImage?

var scaleFactor: CGFloat = 1.3

override func playAnimation(_ icon: UIImageView, textLabel: UILabel) {
    if let selectImage {
        icon.image = selectImage
    }
    textLabel.textColor = textSelectedColor
    icon.transform = CGAffineTransform(scaleX: scaleFactor, y: scaleFactor) // 保持放大
}

/// 取消选中恢复
override func deselectAnimation(_ icon: UIImageView, textLabel: UILabel, defaultTextColor: UIColor, defaultIconColor: UIColor) {
    // 恢复默认 image
    if let normalImage {
        icon.image = normalImage
    }
    textLabel.textColor = defaultTextColor
    icon.transform = .identity
}

/// 初始选中状态，保持放大
override func selectedState(_ icon: UIImageView, textLabel: UILabel) {
    if let selectImage {
        icon.image = selectImage
    }
    textLabel.textColor = textSelectedColor
    icon.transform = CGAffineTransform(scaleX: scaleFactor, y: scaleFactor)
}

}