基础只是要了解

/*******************************************************************************************

 NSString

 *******************************************************************************************/

//一、NSString   

/*----------------创建字符串的方法----------------*/

 

//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 = [[NSStringalloc] init];

astring = @"This is a String!";

[astring release];

NSLog(@"astring:%@",astring);

 

 

 

//3、在以上方法中，提升速度:initWithString方法

 

NSString*astring = [[NSStringalloc] 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 a String!";

NSString*astring = [[NSStringalloc] 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）

 

inti = 1;

intj = 2;

NSString*astring = [[NSStringalloc] initWithString:[NSStringstringWithFormat:@"%d.This is %i string!",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);

 

 

 

 

/*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/   

 

NSString*path = @"astring.text";

NSString*astring = [[NSStringalloc] initWithContentsOfFile:path];

NSLog(@"astring:%@",astring);

[astring release];

 

 

/*----------------写字符串到文件:writeToFile方法----------------*/   

 

 

NSString*astring = [[NSStringalloc] initWithString:@"This is a String!"];

NSLog(@"astring:%@",astring);

NSString*path = @"astring.text";   

[astring writeToFile: path atomically: YES];

[astring release];   

 

 

 

 

/*----------------比较两个字符串----------------*/       

 

//用C比较:strcmp函数

 

charstring1[] = "string!";

charstring2[] = "string!";

if(strcmp(string1, string2) = = 0)

{

    NSLog(@"1");

}

 

 

 

//isEqualToString方法   

NSString*astring01 = @"This is a String!";

NSString*astring02 = @"This is a String!";

BOOLresult = [astring01 isEqualToString: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 a String!";   

BOOLresult = [astring01 compare: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!";

BOOLresult = [astring01 compare: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!";

BOOLresult = [astring01 compare: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!";

BOOLresult = [astring01 caseInsensitiveCompare: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!";

BOOLresult = [astring01 compare: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。

 

 

/*----------------改变字符串的大小写----------------*/   

 

NSString*string1 = @"A String";

NSString*string2 = @"String";

NSLog(@"string1:%@",[string1 uppercaseString]);//大写

NSLog(@"string2:%@",[string2 lowercaseString]);//小写

NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小

 

 

/*----------------在串中搜索子串----------------*/       

 

NSString*string1 = @"This is a string";

NSString*string2 = @"string";

NSRangerange = [string1 rangeOfString:string2];

intlocation = range.location;

intleight = range.length;

NSString*astring = [[NSStringalloc] initWithString:[NSStringstringWithFormat:@"Location:%i,Leight:%i",location,leight]];

NSLog(@"astring:%@",astring);

[astring release];

 

 

/*----------------抽取子串 ----------------*/       

 

//-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 = [string1 substringToIndex: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 = [string1 substringFromIndex: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 = [string1 substringWithRange:NSMakeRange(0, 4)];

NSLog(@"string2:%@",string2);

 

 

//扩展路径

 

NSString*Path = @"~/NSData.txt";

NSString*absolutePath = [Path stringByExpandingTildeInPath];

NSLog(@"absolutePath:%@",absolutePath);

NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);

 

 

 

//文件扩展名

NSString*Path = @"~/NSData.txt";

NSLog(@"Extension:%@",[Path pathExtension]);

 

 

 

 

/*******************************************************************************************

 NSMutableString

 *******************************************************************************************/   

 

/*---------------给字符串分配容量----------------*/

//stringWithCapacity:

NSMutableString*String;

String = [NSMutableStringstringWithCapacity:40];

 

 

/*---------------在已有字符串后面添加字符----------------*/   

 

//appendString: and appendFormat:

 

NSMutableString*String1 = [[NSMutableStringalloc] initWithString:@"This is a NSMutableString"];

//[String1 appendString:@", I will be adding some character"];

[String1 appendFormat:[NSStringstringWithFormat:@", I will be adding some character"]];

NSLog(@"String1:%@",String1);

*/

 

 

/*--------在已有字符串中按照所给出范围和长度删除字符------*/   

/*

 //deleteCharactersInRange:

 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];

 [String1 deleteCharactersInRange:NSMakeRange(0, 5)];

 NSLog(@"String1:%@",String1);

  

  

  

 /*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/

 

//-insertString: atIndex:

NSMutableString*String1 = [[NSMutableStringalloc] initWithString:@"This is a NSMutableString"];

[String1 insertString:@"Hi! " atIndex:0];

NSLog(@"String1:%@",String1);

 

 

 

/*--------将已有的空符串换成其它的字符串------*/

 

//-setString:

NSMutableString*String1 = [[NSMutableStringalloc] initWithString:@"This is a NSMutableString"];

[String1 setString:@"Hello Word!"];

NSLog(@"String1:%@",String1);

 

 

 

/*--------按照所给出的范围，和字符串替换的原有的字符------*/

 

//-setString:

NSMutableString*String1 = [[NSMutableStringalloc] initWithString:@"This is a NSMutableString"];

[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];

NSLog(@"String1:%@",String1);

 

 

 

/*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/

//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";

[String1 hasPrefix:@"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

 *******************************************************************************************/

 

/*---------------------------创建数组------------------------------*/

//NSArray *array = [[NSArray alloc] initWithObjects:

@"One",@"Two",@"Three",@"Four",nil];

 

self.dataArray = array;

[array release];

 

//- (unsigned) Count;数组所包含对象个数；

NSLog(@"self.dataArray cound:%d",[self.dataArray count]);

 

//- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;

NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);

 

 

/*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/   

 

//arrayWithArray:

//NSArray *array1 = [[NSArray alloc] init];

NSMutableArray*MutableArray = [[NSMutableArrayalloc] init];

NSArray*array = [NSArrayarrayWithObjects:

                  @"a",@"b",@"c",nil];

NSLog(@"array:%@",array);

MutableArray = [NSMutableArrayarrayWithArray:array];

NSLog(@"MutableArray:%@",MutableArray);

 

array1 = [NSArrayarrayWithArray:array];

NSLog(@"array1:%@",array1);

 

 

//Copy

 

//id obj;

NSMutableArray*newArray = [[NSMutableArrayalloc] init];

NSArray*oldArray = [NSArrayarrayWithObjects:

                     @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];

 

NSLog(@"oldArray:%@",oldArray);

for(inti = 0; i < [oldArray count]; i++)

{       

    obj = [[oldArray objectAtIndex:i] copy];

    [newArray addObject: 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(idobj in oldArray)

{

    [newArray addObject: obj];

}

//    

NSLog(@"newArray:%@", newArray);

[newArray release];   

 

 

//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);

[newArray release];   

 

 

//Copy and sort

 

//NSMutableArray *newArray = [[NSMutableArray alloc] init];

NSArray*oldArray = [NSArrayarrayWithObjects:

                     @"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];   

NSLog(@"oldArray:%@",oldArray);

NSEnumerator*enumerator;

enumerator = [oldArray objectEnumerator];

idobj;

while(obj = [enumerator nextObject])

{

    [newArray addObject: obj];

}

[newArray sortUsingSelector:@selector(compare:)];

NSLog(@"newArray:%@", newArray);

[newArray release];

 

 

 

/*---------------------------切分数组------------------------------*/

 

//从字符串分割到数组－ componentsSeparatedByString:

NSString*string = [[NSStringalloc] initWithString:@"One,Two,Three,Four"];

NSLog(@"string:%@",string);   

NSArray*array = [string componentsSeparatedByString:@","];

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 = [array componentsJoinedByString:@","];

NSLog(@"string:%@",string);

 

 

 

/*******************************************************************************************

 NSMutableArray

 *******************************************************************************************/

/*---------------给数组分配容量----------------*/

//NSArray *array;

array = [NSMutableArrayarrayWithCapacity:20];

 

 

 

/*--------------在数组末尾添加对象----------------*/

//- (void) addObject: (id) anObject;

//NSMutableArray *array = [NSMutableArray arrayWithObjects:

@"One",@"Two",@"Three",nil];

[array addObject:@"Four"];

NSLog(@"array:%@",array);

 

 

 

/*--------------删除数组中指定索引处对象----------------*/   

//-(void) removeObjectAtIndex: (unsigned) index;   

//NSMutableArray *array = [NSMutableArray arrayWithObjects:

@"One",@"Two",@"Three",nil];

[array removeObjectAtIndex:1];

NSLog(@"array:%@",array);

 

 

 

/*-------------数组枚举---------------*/   

//- (NSEnumerator *)objectEnumerator;从前向后

//NSMutableArray *array = [NSMutableArray arrayWithObjects:

@"One",@"Two",@"Three",nil];

NSEnumerator*enumerator;

enumerator = [array objectEnumerator];

 

idthingie;

while (thingie = [enumerator nextObject]) {

    NSLog(@"thingie:%@",thingie);

}

 

 

//- (NSEnumerator *)reverseObjectEnumerator;从后向前

//NSMutableArray *array = [NSMutableArray arrayWithObjects:

@"One",@"Two",@"Three",nil];

NSEnumerator*enumerator;

enumerator = [array reverseObjectEnumerator];

 

idobject;

while (object = [enumerator nextObject]) {

    NSLog(@"object:%@",object);

}

 

 

//快速枚举

//NSMutableArray *array = [NSMutableArray arrayWithObjects:

@"One",@"Two",@"Three",nil];

for(NSString*string in array)

{

    NSLog(@"string:%@",string);

}

 

 

 

/*******************************************************************************************

 NSDictionary

 *******************************************************************************************/

 

/*------------------------------------创建字典------------------------------------*/

//- (id) initWithObjectsAndKeys;

 

//NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];

NSString*string = [dictionary objectForKey:@"One"];

NSLog(@"string:%@",string);

NSLog(@"dictionary:%@",dictionary);

[dictionary release];

 

 

/*******************************************************************************************

 NSMutableDictionary

 *******************************************************************************************/

 

/*------------------------------------创建可变字典------------------------------------*/   

//创建

NSMutableDictionary*dictionary = [NSMutableDictionarydictionary];

 

//添加字典

[dictionary setObject:@"One"forKey:@"1"];

[dictionary setObject:@"Two"forKey:@"2"];

[dictionary setObject:@"Three"forKey:@"3"];

[dictionary setObject:@"Four"forKey:@"4"];

NSLog(@"dictionary:%@",dictionary);

 

//删除指定的字典

[dictionary removeObjectForKey:@"3"];

NSLog(@"dictionary:%@",dictionary);

 

 

/*******************************************************************************************

 NSValue（对任何对象进行包装）

 *******************************************************************************************/

 

/*--------------------------------将NSRect放入NSArray中------------------------------------*/   

//将NSRect放入NSArray中

NSMutableArray*array = [[NSMutableArrayalloc] init];

NSValue*value;

CGRect rect = CGRectMake(0, 0, 320, 480);   

value = [NSValuevalueWithBytes:&rect objCType:@encode(CGRect)];

[array addObject:value];

NSLog(@"array:%@",array);

 

//从Array中提取

value = [array objectAtIndex:0];

[value getValue:&rect];

NSLog(@"value:%@",value);

 

 

/*******************************************************************************************

 从目录搜索扩展名为jpg的文件

 *******************************************************************************************/

 

//NSFileManager *fileManager = [NSFileManager defaultManager];

NSString*home;

home = @"../Users/";

 

NSDirectoryEnumerator*direnum;

direnum = [fileManager enumeratorAtPath: home];

 

NSMutableArray*files = [[NSMutableArrayalloc] init];

 

//枚举

NSString*filename;

while (filename = [direnum nextObject]) {

    if([[filename pathExtension] hasSuffix:@"jpg"]){

        [files addObject:filename];

    }

}

 

//快速枚举

//for(NSString *filename in direnum)

//{

//    if([[filename pathExtension] isEqualToString:@"jpg"]){

//        [files addObject:filename];

//    }

//}

NSLog(@"files:%@",files);

 

//枚举

NSEnumerator*filenum;

filenum = [files objectEnumerator];

while (filename = [filenum nextObject]) {

    NSLog(@"filename:%@",filename);

}

 

//快速枚举

//for(id object in files)

//{

//    NSLog(@"object:%@",object);

//}