UItexfile实时验证输入字符「建议收藏」

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– (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string;

{

NSString * toBeString = [textField.text stringByReplacingCharactersInRange:range withString:string];

UITextField *loginPass = _textArr[1];

if (loginPass == textField) {

if ([toBeString length] > 12) {

textField.text = [toBeString substringToIndex:12];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@”长度不能超过12″ delegate:nil cancelButtonTitle:@”ok” otherButtonTitles:nil, nil];

;

return NO;

}

}

return YES;

}

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