密码框，再次输入不清空

[cralison]

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

{
if (range.location > 0)
{
textField.text = [textField.text stringByAppendingFormat:@"%@",string] ;
return NO;
}
return YES;
}

[ciwonderful]

这个方法。可行。以前试过。