OC中删除字符串中相邻的重复字符

Question

//去除字符串内的相邻的重复字符，例如：aabdaaadesff，最后结果abdadesf

    NSMutableString *string = [NSMutableString stringWithFormat:@"aabbssddffiieeoo"];

    NSString *strIndex1 = @"";
    NSString *strIndex2 = @"";





    for (NSInteger i = 0; i <= [string length]; i++) {

        strIndex1 = [string substringWithRange:NSMakeRange(i, 1)];

        strIndex2 = [string substringWithRange:NSMakeRange(i + 1, 1)];

        if ([strIndex1 isEqualTo:strIndex2]) {

            [string deleteCharactersInRange:NSMakeRange(i + 1, 1)];


        }

    }

    NSLog(@"%@", string);
            }

运行出来有错误 希望大神帮看看

Answer 1

NSMutableString *string = [NSMutableString stringWithFormat:@"aabbbssddffffiieeoo"];

for (NSInteger i = 0; i < string.length - 1; i++) {
    for (NSInteger j = i+1; j < string.length; j++) {
        NSString *str1 = [string substringWithRange:NSMakeRange(i, 1)];
        NSString *str2 = [string substringWithRange:NSMakeRange(j, 1)];
        if ([str1 isEqualToString:str2]) {
            [string deleteCharactersInRange:NSMakeRange(j, 1)];
            j--;
        } else {
            break;
        }
    }
}