iOS 获取字符串中指定字符串距离的特定字符串最近的位置（字符串）

    NSString *str = @"huangxiaolin";
    NSMutableArray *array =  [self getRangeStr:str findText:@"a"];
    NSMutableArray *array2 =  [self getRangeStr:str findText:@"l"];
    NSInteger findtextIndex = [array2[0] integerValue];
    NSInteger countMix = str.length-1;
    for (int i=0; i