oc温习五：字符串

/**
     substringFromIndex:
     --从第from位数 开始截取字符串
     */
    NSString *str = @"asdfghjkzxcbnm";
    NSString *subFromStr = [str substringFromIndex:4];
    NSLog(@"-----subFromeStr=%@-----", subFromStr);  //ghjkzxcbnm

    /**
     substringToIndex:
     -- 字符串截取到第to位
     */
    NSString *subToStr = [str substringToIndex:6];
    NSLog(@"-----subToStr=%@-----", subToStr); //asdfgh

    /**
     substringWithRange:
     -- 截取range的范围的字符串
     */
    NSString *subRangeStr = [str substringWithRange:NSMakeRange(3, 4)];
    NSLog(@"-----subRangeStr=%@-----", subRangeStr);  //fghj

    /**
     - (NSComparisonResult)compare:(NSString *)string;
     - (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask;
     - (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask range:(NSRange)rangeOfReceiverToCompare;
     -- 字符串的比较大小
     */
    NSString *compareStr = @"fgrt";
    NSLog(@"-----compare=%ld-----",[str compare:compareStr]);//-1

    /**
     caseInsensitiveCompare
     -- 比较字母，忽略大小写
     */
    NSString *caseInsStr = @"adE";
    NSLog(@"-----compare=%ld-----", [str compare:caseInsStr]);//1

    /**
     localizedCompare
     -- 按照 汉字 拼音字母排序
     */
    NSString *name1 = @"安";

    NSLog(@"-----compare=%ld-----",[name1 localizedCompare:@"微微"]);  //-1

    /**
     localizedStandardCompare:
     -- added in 10.6,比较字符串不管是汉子还是字符串
     */
    NSLog(@"-----comare111==%ld-----", [str localizedStandardCompare:name1]);  // 1

    /**
     isEqualToString
     -- 比较两个字符串是否相等
     */

    /**
     hasPrefix:
     -- 是否包含了前缀 str
     */
    NSLog(@"-----hasPrefix=%d-----", [str hasPrefix:@"as"]);

    /**
     hasSuffix:
     -- 结束字符串中是否包含 str 字符串
     */
    NSLog(@"-----hasSuffix=%d-----", [str hasSuffix:@"bnm"]);

    /**
     commonPrefixWithString: options:
     -- 找与之开头相同的字符，返回相同开头的字符串
     */
    NSString *commonPrdfixStr = [str commonPrefixWithString:@"as" options:NSCaseInsensitiveSearch];
    NSLog(@"-----commonPrdfixStr=%@-----", commonPrdfixStr);

    /**
     containsString:
     -- 是否包含了某字符串 区分大小写
     */
    NSLog(@"-----containsString=%d-----", [str containsString:@"Fg"]);  //0

    /**
     localizedCaseInsensitiveContainsString:
     -- 是否包含了某字符串 不区分大小写
     */
    NSLog(@"-----localizedCaseInsensitiveContainsString=%ld-----", [str localizedStandardCompare:@"Fg"]);