APNS或GCM设备令牌验证(APNS or GCM Device Token Validation)
APNS或GCM设备令牌中是否包含任何特殊字符? 我们正在尝试对令牌进行服务器端验证,并且需要知道我们是否应该检查a-z0-9并消除其他所有内容?
Does APNS or GCM device tokens have any special characters in them? we are trying to do server side validation of the tokens and need to know if we should just check for a-z0-9 and eliminate everything else?
原文:https://stackoverflow.com/questions/22862208
更新时间:2023-07-06 22:07
最满意答案
indexPathsForSelectedItems()
返回[NSIndexPath]?
(可选),您必须为可选链接添加另一个问号并删除as? NSIndexPath
作为编译器的as? NSIndexPath
知道解包的类型。if let selectedRowIndex = collectionView?.indexPathsForSelectedItems()?.last {
Solution:
if let selectedRowIndex = collectionView!.indexPathsForSelectedItems()!.last! as? NSIndexPath
My only concern is type safety but it works in my project as it currently is.
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