swift 按钮设置图片 颜色
actionBtn.setTitleColor(UIColor.gray, for: UIControl.State.normal)
actionBtn.tintColor = UIColor.gray
actionBtn.setImage(UIImage.init(named: "report")?.withTintColor(UIColor.gray, renderingMode: UIImage.RenderingMode.alwaysTemplate), for: UIControl.State.normal)
imageView 设置同理