字符串操作总结（一）

发过程中难免遇到字符串操作，下面是为您总结的NSString+NSMutableString+NSValue+NSAraay用法汇总，帮您应对各种字符串操作。

//一、NSString   
   

    //1、创建常量字符串。
    NSString *astring = @"This is a String!";


    //2、创建空字符串，给予赋值。

    NSString *astring = [[NSString alloc] init];
    astring = @"This is aString!";
   NSLog(@"astring:%@",astring);
  [astring release];




   //3、在以上方法中，提升速度:initWithString方法

    NSString *astring = [[NSString alloc]initWithString:@"This is a String!"];
   NSLog(@"astring:%@",astring);
    [astring release];



   //4、用标准c创建字符串:initWithCString方法

    char *Cstring = "This is aString!";
    NSString *astring = [[NSString alloc]initWithCString:Cstring];
   NSLog(@"astring:%@",astring);
    [astring release];



   //5、创建格式化字符串:占位符（由一个%加一个字符组成）

    int i = 1;
    int j = 2;
    NSString *astring = [[NSString alloc]initWithString:[NSString stringWithFormat:@"%d.This is %istring!",i,j]];
   NSLog(@"astring:%@",astring);
    [astring release];



    //6、创建临时字符串

    NSString *astring;
    astring = [NSStringstringWithCString:"This is a temporary string"];
   NSLog(@"astring:%@",astring);




      

    NSString *path = @"astring.text";
    NSString *astring = [[NSString alloc]initWithContentsOfFile:path];
   NSLog(@"astring:%@",astring);
    [astring release];


      


    NSString *astring = [[NSString alloc]initWithString:@"This is a String!"];
   NSLog(@"astring:%@",astring);
    NSString *path =@"astring.text";   
    [astring writeToFile: pathatomically: YES];
    [astringrelease];   




          

    //用C比较:strcmp函数

    char string1[] ="string!";
    char string2[] ="string!";
    if(strcmp(string1, string2) == 0)
    {
       NSLog(@"1");
    }



   //isEqualToString方法   
    NSString *astring01 = @"This is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01isEqualToString:astring02];
   NSLog(@"result:%d",result);




   //compare方法(comparer返回的三种值)  
    NSString *astring01 = @"This is a String!";
    NSString *astring02 = @"This is aString!";   
    BOOL result = [astring01compare:astring02] = = NSOrderedSame;  
   NSLog(@"result:%d",result);  
    //NSOrderedSame判断两者内容是否相同




    NSString *astring01 = @"This is a String!";
    NSString *astring02 = @"this is a String!";
    BOOL result = [astring01compare:astring02] = = NSOrderedAscending;  
   NSLog(@"result:%d",result);
    //NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)



    NSString *astring01 = @"this is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01compare:astring02] = = NSOrderedDescending;  
   NSLog(@"result:%d",result);    
    //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)



    //不考虑大 小写比较字符串1
    NSString *astring01 = @"this is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01caseInsensitiveCompare:astring02] = =NSOrderedSame;   
   NSLog(@"result:%d",result);    
   //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)



    //不考虑大小写比较字符串2
    NSString *astring01 = @"this is a String!";
    NSString *astring02 = @"This is a String!";
    BOOL result = [astring01compare:astring02
                    options:NSCaseInsensitiveSearch | NSNumericSearch] = =NSOrderedSame;   
   NSLog(@"result:%d",result);    

   //NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写NSNumericSearch:比较字符串的字符个数，而不是字符值。


      

    NSString *string1 = @"A String";
    NSString *string2 = @"String";
    NSLog(@"string1:%@",[string1uppercaseString]);//大写
    NSLog(@"string2:%@",[string2lowercaseString]);//小写
    NSLog(@"string2:%@",[string2capitalizedString]);//首字母大小


          

    NSString *string1 = @"This is a string";
    NSString *string2 = @"string";
    NSRange range = [string1rangeOfString:string2];
    int location =range.location;
    int leight =range.length;
    NSString *astring = [[NSString alloc]initWithString:[NSStringstringWithFormat:@"Location:%i,Leight:%i",location,leight]];
   NSLog(@"astring:%@",astring);
    [astring release];


          

    //-substringToIndex:从字符串的开头一直截取到指定的位置，但不包括该位置的字符
    NSString *string1 = @"This is a string";
    NSString *string2 = [string1substringToIndex:3];
   NSLog(@"string2:%@",string2);




    //-substringFromIndex:以指定位置开始（包括指定位置的字符），并包括之后的全部字符
    NSString *string1 = @"This is a string";
    NSString *string2 = [string1substringFromIndex:3];
   NSLog(@"string2:%@",string2);




    //-substringWithRange://按照所给出的位置，长度，任意地从字符串中截取子串
    NSString *string1 = @"This is a string";
    NSString *string2 = [string1substringWithRange:NSMakeRange(0, 4)];
   NSLog(@"string2:%@",string2);
//快速枚举
    //for(NSString *filename in direnum)
    //{
    //   if([[filename pathExtension]isEqualToString:@"jpg"]){
    //      [filesaddObject:filename];
    //   }
    //}
   NSLog(@"files:%@",files);

    //枚举
    NSEnumerator *filenum;
    filenum = [filesobjectEnumerator];
    while (filename = [filenumnextObject]) {
       NSLog(@"filename:%@",filename);
   }
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];  
   NSLog(@"oldArray:%@",oldArray);
    NSEnumerator*enumerator;
    enumerator = [oldArrayobjectEnumerator];
    id obj;
    while(obj = [enumeratornextObject])
    {
       [newArrayaddObject: obj];
    }
    [newArraysortUsingSelector:@selector(compare:)];
    NSLog(@"newArray:%@",newArray);
    [newArray release];



   

    //从字符串分割到数组－componentsSeparatedByString:
    NSString *string = [[NSString alloc]initWithString:@"One,Two,Three,Four"];
   NSLog(@"string:%@",string);  
    NSArray *array = [stringcomponentsSeparatedByString:@","];
   NSLog(@"array:%@",array);
    [string release];


    //从数组合并元素到字符串-componentsJoinedByString:
    NSArray *array = [[NSArrayalloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
    NSString *string = [arraycomponentsJoinedByString:@","];
   NSLog(@"string:%@",string);



   
   
    //NSArray *array;
    array = [NSMutableArrayarrayWithCapacity:20];



   
    //- (void) addObject: (id)anObject;
    //NSMutableArray *array =[NSMutableArray arrayWithObjects:
   @"One",@"Two",@"Three",nil];
    [arrayaddObject:@"Four"];
   NSLog(@"array:%@",array);



      
    //-(void)removeObjectAtIndex: (unsigned) index;  
    //NSMutableArray *array =[NSMutableArray arrayWithObjects:
   @"One",@"Two",@"Three",nil];
    [arrayremoveObjectAtIndex:1];
   NSLog(@"array:%@",array);



      
    //- (NSEnumerator*)objectEnumerator;从前向后
    //NSMutableArray *array =[NSMutableArray arrayWithObjects:
   @"One",@"Two",@"Three",nil];
    NSEnumerator*enumerator;
    enumerator = [arrayobjectEnumerator];

    id thingie;
    while (thingie = [enumeratornextObject]) {
       NSLog(@"thingie:%@",thingie);
    }


    //- (NSEnumerator*)reverseObjectEnumerator;从后向前
    //NSMutableArray *array =[NSMutableArray arrayWithObjects:
   @"One",@"Two",@"Three",nil];
    NSEnumerator*enumerator;
    enumerator = [arrayreverseObjectEnumerator];

    id object;
    while (object = [enumeratornextObject]) {
       NSLog(@"object:%@",object);
    }


    //快速枚举
    //NSMutableArray *array =[NSMutableArray arrayWithObjects:
   @"One",@"Two",@"Three",nil];
    for(NSString *string in array)
    {
       NSLog(@"string:%@",string);
    }



   

   
    //- (id)initWithObjectsAndKeys;

    //NSDictionary *dictionary =[[NSDictionary alloc]initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
    NSString *string = [dictionaryobjectForKey:@"One"];
   NSLog(@"string:%@",string);
   NSLog(@"dictionary:%@",dictionary);
    [dictionary release];


   

      
    //创建
    NSMutableDictionary*dictionary = [NSMutableDictionary dictionary];

    //添加字典
    [dictionary setObject:@"One"forKey:@"1"];
    [dictionary setObject:@"Two"forKey:@"2"];
    [dictionarysetObject:@"Three" forKey:@"3"];
    [dictionary setObject:@"Four"forKey:@"4"];
   NSLog(@"dictionary:%@",dictionary);

    //删除指定的字典
    [dictionaryremoveObjectForKey:@"3"];
   NSLog(@"dictionary:%@",dictionary);


   

      
    //将NSRect放入NSArray中
    NSMutableArray *array =[[NSMutableArray alloc] init];
    NSValue *value;
    CGRect rect = CGRectMake(0,0, 320, 480);   
    value = [NSValuevalueWithBytes:&rectobjCType:@encode(CGRect)];
    [arrayaddObject:value];
   NSLog(@"array:%@",array);

    //从Array中 提取
    value = [arrayobjectAtIndex:0];
    [valuegetValue:&rect];
   NSLog(@"value:%@",value);


   

    //NSFileManager *fileManager= [NSFileManager defaultManager];
    NSString *home;
    home = @"../Users/";

    NSDirectoryEnumerator*direnum;
    direnum = [fileManagerenumeratorAtPath: home];

    NSMutableArray *files =[[NSMutableArray alloc] init];

    //枚举
    NSString *filename;
    while (filename = [direnumnextObject]) {
       if([[filenamepathExtension] hasSuffix:@"jpg"]){
          [filesaddObject:filename];
       }
   }
//扩展路径

    NSString *Path = @"~/NSData.txt";
    NSString *absolutePath = [PathstringByExpandingTildeInPath];
   NSLog(@"absolutePath:%@",absolutePath);
   NSLog(@"Path:%@",[absolutePathstringByAbbreviatingWithTildeInPath]);



    //文件扩展名
    NSString *Path = @"~/NSData.txt";
    NSLog(@"Extension:%@",[PathpathExtension]);




      

   
    //stringWithCapacity:
    NSMutableString*String;
    String = [NSMutableStringstringWithCapacity:40];


      

    //appendString: andappendFormat:

    NSMutableString *String1 =[[NSMutableString alloc] initWithString:@"This is aNSMutableString"];
    //[String1 appendString:@", Iwill be adding some character"];
    [String1appendFormat:[NSString stringWithFormat:@", I will be adding somecharacter"]];
   NSLog(@"String1:%@",String1);
    */


      
   

    //-insertString:atIndex:
    NSMutableString *String1 =[[NSMutableString alloc] initWithString:@"This is aNSMutableString"];
    [String1 insertString:@"Hi! "atIndex:0];
   NSLog(@"String1:%@",String1);



   

    //-setString:
    NSMutableString *String1 =[[NSMutableString alloc] initWithString:@"This is aNSMutableString"];
    [String1 setString:@"HelloWord!"];
   NSLog(@"String1:%@",String1);



   

    //-setString:
    NSMutableString *String1 =[[NSMutableString alloc] initWithString:@"This is aNSMutableString"];
    [String1replaceCharactersInRange:NSMakeRange(0, 4)withString:@"That"];
   NSLog(@"String1:%@",String1);



   
    //01： 检查字符串是否以另一个字符串开头-(BOOL) hasPrefix: (NSString *)aString;
    NSString *String1 =@"NSStringInformation.txt";
    [String1hasPrefix:@"NSString"] = = 1?  NSLog(@"YES") :NSLog(@"NO");
    [String1 hasSuffix:@".txt"] == 1 ?  NSLog(@"YES") :NSLog(@"NO");

    //02： 查找字符串某处是否包含其它字符串 -(NSRange) rangeOfString: (NSString*) aString，这一点前面在串中搜索子串用到过;



   

   
    //NSArray *array = [[NSArrayalloc] initWithObjects:
   @"One",@"Two",@"Three",@"Four",nil];

    self.dataArray = array;
    [array release];

    //- (unsigned)Count;数组所包含对象个数；
    NSLog(@"self.dataArraycound:%d",[self.dataArray count]);

    //- (id) objectAtIndex:(unsigned int) index;获取指定索引处的对象;
    NSLog(@"self.dataArray cound2:%@",[self.dataArray objectAtIndex:2]);


      

    //arrayWithArray:
    //NSArray *array1 = [[NSArrayalloc] init];
    NSMutableArray *MutableArray= [[NSMutableArray alloc] init];
    NSArray *array = [NSArrayarrayWithObjects:
                @"a",@"b",@"c",nil];
   NSLog(@"array:%@",array);
    MutableArray =[NSMutableArray arrayWithArray:array];
   NSLog(@"MutableArray:%@",MutableArray);

    array1 = [NSArrayarrayWithArray:array];
   NSLog(@"array1:%@",array1);


    //Copy

    //id obj;
    NSMutableArray *newArray =[[NSMutableArray alloc] init];
    NSArray *oldArray = [NSArrayarrayWithObjects:
                  @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];

   NSLog(@"oldArray:%@",oldArray);
    for(int i = 0; i< [oldArray count]; i++)
    {      
       obj =[[oldArray objectAtIndex:i] copy];
       [newArrayaddObject: obj];
    }
    //    
    NSLog(@"newArray:%@",newArray);
    [newArray release];


    //快速枚举

    //NSMutableArray *newArray =[[NSMutableArray alloc] init];
    NSArray *oldArray = [NSArrayarrayWithObjects:
                  @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];  
   NSLog(@"oldArray:%@",oldArray);

    for(id obj in oldArray)
    {
       [newArrayaddObject: obj];
    }
    //    
    NSLog(@"newArray:%@",newArray);
    [newArrayrelease];   


    //Deep copy

    //NSMutableArray *newArray =[[NSMutableArray alloc] init];
    NSArray *oldArray = [NSArrayarrayWithObjects:
                  @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];  
   NSLog(@"oldArray:%@",oldArray);  
    newArray =(NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault,(CFPropertyListRef)oldArray,kCFPropertyListMutableContainers);
    NSLog(@"newArray:%@",newArray);
    [newArrayrelease];   


    //Copy and sort

    //NSMutableArray *newArray =[[NSMutableArray alloc] init];
    NSArray *oldArray = [NSArrayarrayWithObjects: