在iOS中的textField上进行电子邮件验证 [英] Email validation on textField in iOS
本文介绍了在iOS中的textField上进行电子邮件验证的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在iOS App中,如何在UITextField上添加电子邮件验证?
In iOS App, how to add Email validation on UITextField?
推荐答案
使用NSPredicate和Regex:
Use NSPredicate and Regex:
- (BOOL)validateEmailWithString:(NSString*)email
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:email];
}
对于一堆用逗号分隔的电子邮件:
For a bunch of emails separated by a comma:
- (NSMutableArray*)validateEmailWithString:(NSString*)emails
{
NSMutableArray *validEmails = [[NSMutableArray alloc] init];
NSArray *emailArray = [emails componentsSeparatedByString:@","];
for (NSString *email in emailArray)
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
if ([emailTest evaluateWithObject:email])
[validEmails addObject:email];
}
return [validEmails autorelease];
}
编辑答案:(它还可以验证多余的点)
Edited Answer: (It also validates extra dots )
- (BOOL)validateEmailWithString:(NSString*)checkString
{
BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
NSString *laxString = @".+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:checkString];
}
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