Question

嗨朋友我想在表格视图单元格中显示信用卡号码，所以我想只显示最后四个字符，如 XXXXXXXXXX1111 第一个字符用x或其他字符替换我怎么能这样做谁能帮我我试过像吼叫一样

NSString *CardNumber = [CardNumberValues objectAtIndex:indexPath.row];
NSRange subStringRange = NSMakeRange(0,[CardNumber length]-4); 
NSMutableCharacterSet *NumSet = [NSMutableCharacterSet characterSetWithRange:subStringRange];
CardNumber = [[CardNumber componentsSeparatedByCharactersInSet:NumSet] componentsJoinedByString:@"X"];
cell.CardNumber.text = CardNumber;

但它不起作用你可以建议任何参考或代码......

Answer 1

使用此

NSString *CardNumber = @"12345678901234";
NSString *str_padding=@"";
    NSRange subStringRange = NSMakeRange(0,[CardNumber length]-4); 
    str_padding =[str_padding stringByPaddingToLength:subStringRange.length withString:@"X" startingAtIndex:0];
    CardNumber = [CardNumber stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@",[CardNumber substringToIndex:subStringRange.length]] withString:str_padding];
    NSLog(@"%@",CardNumber);

Answer 2

NSString *cardNumber = [NSString stringWithFormat: @"XXXX-XXXX-XXXX-%@", [[CardNumberValues objectAtIndex:indexPath.row] subStringWithIndex:12]];
cell.CardNumber.text = cardNumber;

我假设卡号是16位数。

子串在NSString中带有星号

2 个答案: