问题描述
尝试让应用程序启动 URL 的默认浏览器,但前提是输入的 URL 有效,否则会显示一条消息,指出该 URL 无效.
Trying to make an app launch the default browser to a URL, but only if the URL entered is valid, otherwise it displays a message saying the URL is invalid.
我将如何使用 Swift 检查有效性?
How would I go about checking the validity using Swift?
推荐答案
如果您的目标是验证您的应用程序是否可以打开 URL,您可以执行以下操作.尽管 safari 可以打开 URL,但该网站可能不存在或已关闭.
If your goal is to verify if your application can open a URL, here is what you can do. Although safari can open the URL, the website might not exist or it might be down.
// Swift 5
func verifyUrl (urlString: String?) -> Bool {
if let urlString = urlString {
if let url = NSURL(string: urlString) {
return UIApplication.shared.canOpenURL(url as URL)
}
}
return false
}
作为旁注,这不检查 URL 是否有效或完整.例如,一个通过https://"的调用返回真.
As a side note, this does not check whether or not a URL is valid or complete. For example, a call that passes "https://" returns true.
这篇关于如何在 Swift 中检查 URL 的有效性?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!