ios - 如何从 UIPasteBoard 检查 NSString 格式

Question

我允许用户从我的网站复制注册密钥，然后将 NSStirng 保存到剪贴板，当应用程序通过注册对话框打开时，我立即使用此代码检查剪贴板 -

NSString *registrationCode = [UIPasteboard generalPasteboard].string;

现在我有了粘贴板中的值，我想检查它的格式。它应该类似于AAAA-AAAA-AAAA-AAAA所以本质上没有数字，没有空格（包括前面和结尾），没有小写，没有特殊字符...只有大写字符。我怎么能做到这一点？

Answer 1

尝试在您的代码中执行此操作：

NSCharacterSet * everythingThatsAllowedSet = [NSCharacterSet characterSetWithCharactersInString: @"ABCDEFGHIJKLMNOPQRSTUVWXYZ-"];
NSCharacterSet * characterSetFromRegistrationCode = [NSCharacterSet characterSetWithCharactersInString: registrationCode];

if([everythingThatsAllowedSet isSupersetOfSet: characterSetFromRegistrationCode ] == YES)
    NSLog( @"this is a valid registration code");
else
{
    // if there are any characters in the registration code that aren't members of
    // the everythingAllowed set, the "isSupersetOfSet" test will fail
    NSLog( @"this has invalid characters");
}