[英]How to remove special characters'&' from UItextField iPhone
I searched a lot over Google, but cant find a valid solution for best way to remove special characters'&' from Text Field in iPhone 我在谷歌搜索了很多,但无法找到一个有效的解决方案,以便从iPhone中的文本字段中删除特殊字符“&”
I only want to remove or delimit user to enter '&' keyword. 我只想删除或分隔用户输入'&'关键字。
I know that I have to do something in function 我知道我必须在功能上做点什么
- (BOOL)textField:(UITextField *)textFieldBeingChanged shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
But what exactly not getting it properly. 但到底是什么原因并不恰当。
Thanks in advance..... 提前致谢.....
See if this works : 看看这是否有效:
-(NSString *) formatIdentificationNumber:(NSString *)string
{
NSCharacterSet * invalidNumberSet = [NSCharacterSet characterSetWithCharactersInString:@"\n_!@#$%^&*()[]{}'\".,<>:;|\\/?+=\t~` "];
NSString * result = @"";
NSScanner * scanner = [NSScanner scannerWithString:string];
NSString * scannerResult;
[scanner setCharactersToBeSkipped:nil];
while (![scanner isAtEnd])
{
if([scanner scanUpToCharactersFromSet:invalidNumberSet intoString:&scannerResult])
{
result = [result stringByAppendingString:scannerResult];
}
else
{
if(![scanner isAtEnd])
{
[scanner setScanLocation:[scanner scanLocation]+1];
}
}
}
return result;
}
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