1. 折分字符串操作：

#import 
     
      int main (int argc, const char * argv[]){    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];    //将一个句子分解为单独的单词     NSString *string1 = @"my name is bill";    NSArray *words = [string1 componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];    NSLog(@"Word array: %@", words);        //把一个NSString追加到另一个NSString    NSString *str1 = @"第一个字符串 ";    NSString *str2 = @"第二个字符串。";    NSString *result = [str1 stringByAppendingFormat:str2];    NSLog(@"result: %@", result);    [pool drain];    return 0;}
     

2. C字符串和NSString之间的转换

#import 
     
      int main (int argc, const char * argv[]){    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];    //C字符串和NSString之间的转换    char* cString = "Hello bill.";    NSString *nsString = [NSString stringWithUTF8String:cString];    NSLog(@"%@\r\n",nsString);        char* cString2 = [nsString UTF8String];    printf(cString2);    printf("\r\n");    [pool drain];    return 0;}
     

3.可变字符串

#import 
     
      int main (int argc, const char * argv[]){    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];    NSMutableString *mutableString = [NSMutableString stringWithString:@"可变字符串:"];        [mutableString insertString:@"NSMutableString" atIndex:[mutableString length]];        NSLog(@"%@", mutableString);    [pool drain];    return 0;}