按钮禁用时置灰

Introduce/Record/INVideoExportController.swift

@@ -82,6 +82,7 @@ class INVideoExportController: BFBaseViewController {
         let btn = UIButton()
         btn.setTitle(" 保存到相册", for: .normal)
         btn.setTitleColor(.white, for: .normal)
+        btn.setTitleColor(.gray, for: .disabled)
         btn.setImage(UIImage(named: "export_btn"), for: .normal)
         btn.backgroundColor = ThemeStyleColor
         btn.addCorner(roundingCorners: .allCorners, corner: 8)