oc string

转自http://www.cnblogs.com/CCSSPP/archive/2011/10/20/2218897.html

备用查看

         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",];
     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:];
     NSLog(string1,nil);
     //删除字符串
     NSMutableString* string2=[NSMutableString stringWithFormat:@"删除字符串"];
     [string2 deleteCharactersInRange:NSMakeRange(, )];
     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:];
     NSLog(nstr1,nil);
     //抽取末位位置的字符串
     nstr2=[string6 substringFromIndex:];
     NSLog(nstr2,nil);
     //抽取指定范围的字符串
     nstr3=[string6 substringWithRange:NSMakeRange(,)];
     NSLog(nstr3,nil);

http://www.cnblogs.com/CCSSPP/archive/2011/10/20/2218897.html