Objective-C字符串处理

NSLog(@"字符串处理");
        //获得字符串长度
        NSString* str1=@"MAC OS Pro";
        NSLog(@"长度是 %d",[str1 length]);
        //两个字符串连接
        NSString* str2=@"MAC OS Pro";
        NSString* str3=@" Leopard";
        NSString* str4=[str2 stringByAppendingString:str3];
        NSLog(str4,nil);
        NSString* str5=[str2 stringByAppendingFormat:@" %d",10];
        NSLog(str5,nil); 
        //可修改字符串
        NSMutableString* string=[NSMutableString string];
        [string appendString:@"Mac"];
        [string appendString:@" OS"];
        [string appendString:@" X"];
        NSLog(string,nil); 
        //插入字符串
        NSMutableString* string1=[NSMutableString stringWithFormat:@"Mac X"];
        [string1 insertString:@"OS " atIndex:4];
        NSLog(string1,nil);
        //删除字符串
        NSMutableString* string2=[NSMutableString stringWithFormat:@"删除字符串"];
        [string2 deleteCharactersInRange:NSMakeRange(0, 2)];
        NSLog(string2,nil);
        //字符串比较
        BOOL result;
        result=[string isEqualToString:string1];
        NSLog(@"%d",result,nil);
        //比较前置串与后置串
        NSString* string3=@"Mac Pro";
        NSString* string4=@"Mac OS";
        //判断是否以Mac开头
        result=[string3 hasPrefix:@"Mac"];
        NSLog(@"%d",result,nil);
        //判断是否以OS结尾
        result=[string4 hasSuffix:@"OS"];
        NSLog(@"%d",result,nil);
        NSString* string5=@"This is Mac OS X";
        //检索字符串
        NSRange range;
        range=[string5 rangeOfString:@"Mac OS"];
        if (range.location!=NSNotFound) 
        {
                //得到字符串的位置和长度
                NSLog(@"%d,%d",range.location,range.length);
        }
        else 
        {
                NSLog(@"没有发现",nil);
        }
        //抽取部分字符串
        NSString* string6=@"This is Mac OS X";
        NSString *nstr1,*nstr2,*nstr3;
        //从开头抽取字符串
        nstr1=[string6 substringToIndex:4];
        NSLog(nstr1,nil);
        //抽取末位位置的字符串
        nstr2=[string6 substringFromIndex:8];
        NSLog(nstr2,nil);
        //抽取指定范围的字符串
        nstr3=[string6 substringWithRange:NSMakeRange(5,2)];
        NSLog(nstr3,nil);
//结果
2011-10-20 14:05:43.940 StringProcessing[1870:1307] 字符串处理
2011-10-20 14:05:43.942 StringProcessing[1870:1307] 长度是 10
2011-10-20 14:05:43.943 StringProcessing[1870:1307] MAC OS Pro Leopard
2011-10-20 14:05:43.943 StringProcessing[1870:1307] MAC OS Pro 10
2011-10-20 14:05:43.944 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.945 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.945 StringProcessing[1870:1307] 字符串
2011-10-20 14:05:43.946 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.946 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.947 StringProcessing[1870:1307] 1
2011-10-20 14:05:43.947 StringProcessing[1870:1307] 8,6
2011-10-20 14:05:43.948 StringProcessing[1870:1307] This
2011-10-20 14:05:43.948 StringProcessing[1870:1307] Mac OS X
2011-10-20 14:05:43.949 StringProcessing[1870:1307] is

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