objective-c - 如何格式化 NSTextField 或 UITextField？

Question

我想将放置到 NSTextField/UITextField 中的任何文本格式化为看起来像

###-###-####

这里有一些可能的输入

1112223333
111.222.3333
(111)222-3333
(111) 2223333

Answer 1

我已经测试了这段代码，它适用于您的所有示例:

- (NSString *)convertNumber:(NSString *)input {
    NSMutableString *result = [NSMutableString stringWithCapacity:15];
    NSScanner *scanner = [NSScanner scannerWithString:input];
    NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"1234567890"];
    NSString *temp;
    NSInteger location = 0;

    // Get first group
    [scanner scanUpToCharactersFromSet:numbers intoString:&temp];
    location = [scanner scanLocation];
    [scanner scanCharactersFromSet:numbers intoString:&temp];
    [result appendString:temp];

    if ([scanner scanLocation] < location + 4) {
        // Only scanned three numbers - get second group
        [scanner scanUpToCharactersFromSet:numbers intoString:&temp];
        location = [scanner scanLocation];
        [scanner scanCharactersFromSet:numbers intoString:&temp];
        [result appendString:temp];

        if ([scanner scanLocation] < location + 4) {
            // Only scanned three numbers - get last group
            [scanner scanUpToCharactersFromSet:numbers intoString:&temp];
            [scanner scanCharactersFromSet:numbers intoString:&temp];
            [result appendString:temp];
        }
    } else if ([scanner scanLocation] < location + 7) {
        // Scanned six numbers - get last group
        [scanner scanUpToCharactersFromSet:numbers intoString:&temp];
        [scanner scanCharactersFromSet:numbers intoString:&temp];
        [result appendString:temp];
    }

    // Add dashes
    if ([result length] > 6) {
        [result insertString:@"-" atIndex:3];
        [result insertString:@"-" atIndex:7];
    }

    return result;
}

3、3 和 4 组之间的任何数量的非数字字符(或无)都将被忽略。

警告:它可能会到处泄漏，如果输入意外，可能会崩溃。