iOS學習-7 限制 TextField 輸入字元長度，iostextfield

iOS學習-7 限制 TextField 輸入字元長度，iostextfield

#pragma mark -- TextField代理-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{/* // Method - one    int limit = 3;    return !([textField.text length] > limit && [string length] > range.length);*/ // Method - two    if (textField == self.passWordLabel) {        if (range.length + range.location > textField.text.length) {            return NO;        }        NSUInteger newLength = [textField.text length] + [string length] - range.length;        return newLength <= 4;    }    return YES;}

Method - one 比較繞