[IOS] Objective-C 字符处理函数

//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