字符串壓縮

網上看到的一個帖子,保存下來,

-(NSString *)simplifyStringFromString:(NSString *)str{ 

    int strIndex = 0; 
    int repeatCount = 0; 
    NSString *tempStr = nil; 
    NSString *returnStr = nil; 
    while (strIndex <= str.length) { 
        NSString *c = nil; 
        if (strIndex != str.length) { 
            c = [str substringWithRange:NSMakeRange(strIndex, 1)]; 
        } 
        if (strIndex == 0) { 
            tempStr = c; 
        } 
        if (![c isEqualToString:tempStr]) { 
            if (repeatCount != 0) { 
                returnStr = [NSString stringWithFormat:@"%@%d",returnStr ? returnStr : @"",repeatCount]; 
            } 
            returnStr = [NSString stringWithFormat:@"%@%@",returnStr ? returnStr : @"",tempStr]; 
            tempStr = c; 
            repeatCount = 1; 
        }else{ 
            repeatCount ++; 
        } 
        strIndex ++; 
    } 
    return returnStr; 
} 
 
    NSString *str = @"abbcccddddeeeeeffffff"; 
    NSString *result = [self simplifyStringFromString:str]; 
    NSLog(@"%@",result); 
 
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