修复订单来源弹窗打开时的图片预览展示

suixinkan/Base/BaseViewController.swift

@@ -119,6 +119,30 @@ class BaseViewController: UIViewController {
         navigationController?.popViewController(animated: true)
     }
 
+    /// 沿 presentation 链找到当前最顶层控制器，避免 Sheet 已展示时 present 冲突。
+    func topMostPresentedViewController() -> UIViewController {
+        var top: UIViewController = self
+        while let presented = top.presentedViewController {
+            top = presented
+        }
+        return top
+    }
+
+    /// 在当前可见 presentation 链顶端弹出页面。
+    func presentOnTop(
+        _ viewController: UIViewController,
+        animated: Bool = true,
+        completion: (() -> Void)? = nil
+    ) {
+        topMostPresentedViewController().present(viewController, animated: animated, completion: completion)
+    }
+
+    /// 全屏预览网络图片。
+    func presentImagePreview(imageURLs: [String], startIndex: Int) {
+        guard !imageURLs.isEmpty else { return }
+        presentOnTop(ImagePreviewViewController(imageURLs: imageURLs, startIndex: startIndex))
+    }
+
     // MARK: - Notifications
 
     private func registerBaseNotifications() {