除了点和下划线外,如何限制UITextField
中的特殊字符?
我try 了下面的代码片段,但没有成功:
#define ACCEPTABLE_CHARECTERS @" ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *acceptedInput = [NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARECTERS];
if (![[string componentsSeparatedByCharactersInSet:acceptedInput] count] > 1){
NSLog(@"not allowed");
return NO;
}
else{
return YES;
}
}