從存儲中下載圖像時出現可選錯誤，我已將字符串轉換為URL

Question

從firebase存儲中下載映像時出現可選錯誤，我將字符串轉換為URL以下載映像

這里是發生錯誤的代碼，如果需要更多代碼，請告訴我

let imageUrl = URL(string: post._postuserprofileImagUrl)
        ImageService.getImage(withURL: imageUrl) { image in
            self.profileImageView.image = image
        }

Answer 1

您必須（安全地）解包URL實例

if let imageUrl = URL(string: post._postuserprofileImagUrl) {
        ImageService.getImage(withURL: imageUrl) { image in
            self.profileImageView.image = image
        }
}

或者甚至（如果postuserprofileImagUrl也是可選的）

if let userprofileImagUrl =  post._postuserprofileImagUrl,
   let imageUrl = URL(string: userprofileImagUrl) {
        ImageService.getImage(withURL: imageUrl) { image in
            self.profileImageView.image = image
        }
}