//將NSData轉(zhuǎn)化為NSString
NSString* str = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
//將NSString 轉(zhuǎn)化為NSData
(NSString.h)
- (NSData *)dataUsingEncoding:(NSStringEncoding)encoding;
//載一個(gè)字符串中刪除一個(gè)字符或字符串
[_display deleteCharactersInRange:NSMakeRange(index_of_char_to_remove, 1)];
數(shù)學(xué)轉(zhuǎn)換為字符串
NSString *returnStr;
returnStr = [[NSNumber numberWithInt:row] stringValue];
NSString
*******************************************************************************************/
//一、NSString
/*----------------創(chuàng)建字符串的方法----------------*/
//1、創(chuàng)建常量字符串。
NSString *astring = @"This is a String!";
//2、創(chuàng)建空字符串，給予賦值。
NSString *astring = [[NSString alloc] 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 = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
[astring release];
//4、用標(biāo)準(zhǔn)c創(chuàng)建字符串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astring release];
//5、創(chuàng)建格式化字符串:占位符（由一個(gè)%加一個(gè)字符組成）
int i = 1;
int j = 2;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astring release];
//6、創(chuàng)建臨時(shí)字符串
NSString *astring;
astring = [NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
/*----------------從文件讀取字符串:initWithContentsOfFile方法----------------*/
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------寫字符串到文件:writeToFile方法----------------*/
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
/*----------------比較兩個(gè)字符串----------------*/
//用C比較:strcmp函數(shù)
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 = [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//compare方法(comparer返回的三種值)
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame判斷兩者內(nèi)容是否相同
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
NSLog(@"result:%d",result);
//NSOrderedAscending判斷兩對(duì)象值的大小(按字母順序進(jìn)行比較，astring02大于astring01為真)
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
NSLog(@"result:%d",result);
//NSOrderedDescending判斷兩對(duì)象值的大小(按字母順序進(jìn)行比較，astring02小于astring01為真)
//不考慮大小寫比較字符串1
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedDescending判斷兩對(duì)象值的大小(按字母順序進(jìn)行比較，astring02小于astring01為真)
//不考慮大小寫比較字符串2
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSCaseInsensitiveSearch:不區(qū)分大小寫比較 NSLiteralSearch:進(jìn)行完全比較，區(qū)分大小寫 NSNumericSearch:比較字符串的字符個(gè)數(shù)，而不是字符值。
/*----------------改變字符串的大小寫----------------*/
NSString *string1 = @"A String";
NSString *string2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大寫
NSLog(@"string2:%@",[string2 lowercaseString]);//小寫
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";
NSRange range = [string1 rangeOfString:string2];
int location = range.location;
int leight = range.length;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------抽取子串 ----------------*/
//-substringToIndex: 從字符串的開頭一直截取到指定的位置，但不包括該位置的字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置開始（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: //按照所給出的位置，長(zhǎng)度，任意地從字符串中截取子串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
//擴(kuò)展路徑
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//文件擴(kuò)展名
NSString *Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
/*******************************************************************************************
NSMutableString
*******************************************************************************************/
/*---------------給字符串分配容量----------------*/
//stringWithCapacity:
NSMutableString *String;
String = [NSMutableString stringWithCapacity:40];
/*---------------在已有字符串后面添加字符----------------*/
//appendString: and appendFormat:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
//[String1 appendString:@", I will be adding some character"];
[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
NSLog(@"String1:%@",String1);
*/
/*--------在已有字符串中按照所給出范圍和長(zhǎng)度刪除字符------*/
/*
//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給出的字符串------*/
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
/*--------將已有的空符串換成其它的字符串------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
/*--------按照所給出的范圍，和字符串替換的原有的字符------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
/*-------------判斷字符串內(nèi)是否還包含別的字符串(前綴，后綴)-------------*/
//01：檢查字符串是否以另一個(gè)字符串開頭- (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：查找字符串某處是否包含其它字符串 - (NSRange) rangeOfString: (NSString *) aString，這一點(diǎn)前面在串中搜索子串用到過;
/*******************************************************************************************
NSArray
*******************************************************************************************/
/*---------------------------創(chuàng)建數(shù)組------------------------------*/
//NSArray *array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
self.dataArray = array;
[array release];
//- (unsigned) Count;數(shù)組所包含對(duì)象個(gè)數(shù)；
NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
//- (id) objectAtIndex: (unsigned int) index;獲取指定索引處的對(duì)象;
NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
/*--------------------------從一個(gè)數(shù)組拷貝數(shù)據(jù)到另一數(shù)組(可變數(shù)級(jí))----------------------------*/
//arrayWithArray:
//NSArray *array1 = [[NSArray alloc] init];
NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
NSArray *array = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
MutableArray = [NSMutableArray arrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);
array1 = [NSArray arrayWithArray:array];
NSLog(@"array1:%@",array1);
//Copy
//id obj;
NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"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];
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArray release];
//快速枚舉
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(id obj in oldArray)
{
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArray release];
//Deep copy
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"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 = [NSArray arrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
NSLog(@"oldArray:%@",oldArray);
NSEnumerator *enumerator;
enumerator = [oldArray objectEnumerator];
id obj;
while(obj = [enumerator nextObject])
{
[newArray addObject: obj];
}
[newArray sortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@", newArray);
[newArray release];
/*---------------------------切分?jǐn)?shù)組------------------------------*/
//從字符串分割到數(shù)組－ componentsSeparatedByString:
NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string);
NSArray *array = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[string release];
//從數(shù)組合并元素到字符串- componentsJoinedByString:
NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSString *string = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
/*******************************************************************************************
NSMutableArray
*******************************************************************************************/
/*---------------給數(shù)組分配容量----------------*/
//NSArray *array;
array = [NSMutableArray arrayWithCapacity:20];
/*--------------在數(shù)組末尾添加對(duì)象----------------*/
//- (void) addObject: (id) anObject;
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array addObject:@"Four"];
NSLog(@"array:%@",array);
/*--------------刪除數(shù)組中指定索引處對(duì)象----------------*/
//-(void) removeObjectAtIndex: (unsigned) index;
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array removeObjectAtIndex:1];
NSLog(@"array:%@",array);
/*-------------數(shù)組枚舉---------------*/
//- (NSEnumerator *)objectEnumerator;從前向后
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator *enumerator;
enumerator = [array objectEnumerator];
id thingie;
while (thingie = [enumerator nextObject]) {
NSLog(@"thingie:%@",thingie);
}
//- (NSEnumerator *)reverseObjectEnumerator;從后向前
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator *enumerator;
enumerator = [array reverseObjectEnumerator];
id object;
while (object = [enumerator nextObject]) {
NSLog(@"object:%@",object);
}
//快速枚舉
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
for(NSString *string in array)
{
NSLog(@"string:%@",string);
}
/*******************************************************************************************
NSDictionary
*******************************************************************************************/
/*------------------------------------創(chuàng)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
*******************************************************************************************/
/*------------------------------------創(chuàng)建可變字典------------------------------------*/
//創(chuàng)建
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
//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);
//刪除指定的字典
[dictionary removeObjectForKey:@"3"];
NSLog(@"dictionary:%@",dictionary);
/*******************************************************************************************
NSValue（對(duì)任何對(duì)象進(jìn)行包裝）
*******************************************************************************************/
/*--------------------------------將NSRect放入NSArray中------------------------------------*/
//將NSRect放入NSArray中
NSMutableArray *array = [[NSMutableArray alloc] init];
NSValue *value;
CGRect rect = CGRectMake(0, 0, 320, 480);
value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
[array addObject:value];
NSLog(@"array:%@",array);
//從Array中提取
value = [array objectAtIndex:0];
[value getValue:&rect];
NSLog(@"value:%@",value);
/*******************************************************************************************
從目錄搜索擴(kuò)展名為jpg的文件
*******************************************************************************************/
//NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *home;
home = @"../Users/";
NSDirectoryEnumerator *direnum;
direnum = [fileManager enumeratorAtPath: home];
NSMutableArray *files = [[NSMutableArray alloc] init];
//枚舉
NSString *filename;
while (filename = [direnum nextObject]) {
if([[filename pathExtension] hasSuffix:@"jpg"]){
[files addObject:filename];
}
}
//快速枚舉
//for(NSString *filename in direnum)
//{
//??? if([[filename pathExtension] isEqualToString:@"jpg"]){
//??????? [files addObject:filename];
//??? }
//}
NSLog(@"files:%@",files);
//枚舉
NSEnumerator *filenum;
filenum = [files objectEnumerator];
while (filename = [filenum nextObject]) {
NSLog(@"filename:%@",filename);
}
//快速枚舉
//for(id object in files)
//{
//??? NSLog(@"object:%@",object);
//}
#import
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
//創(chuàng)建字符串
NSString *height;
/**類方法：
+(id) stringWithFormat: (NSString *) format,...
通過格式字符串和參數(shù)來創(chuàng)建NSString
省略號(hào)（。。。）：可以接受多個(gè)以逗號(hào)分割的參數(shù)。
這聲明方法時(shí)添加加號(hào)（＋），那么這個(gè)方法為類方法，不需要?jiǎng)?chuàng)建實(shí)例就可以調(diào)用，通常用于創(chuàng)建心的實(shí)例，我們稱用來創(chuàng)建新對(duì)象的類方法為工廠方法。
－－－－－－－－－－－－－－－－－－－
objective－c運(yùn)行時(shí)生成一個(gè)類的時(shí)候，它會(huì)創(chuàng)建一個(gè)代表該類的類對(duì)象。類對(duì)象包含了指向超類的指針，類名，和指向類方法列表的指針。類對(duì)象還包含一個(gè)long型數(shù)據(jù)，為新創(chuàng)建的類實(shí)例對(duì)象指定大?。ㄒ宰止?jié)為單位）
類方法可以用來訪問全局?jǐn)?shù)據(jù)。
實(shí)例方法要用前導(dǎo)減號(hào)（－）來開始聲明
*/
height=[NSString stringWithFormat:@"you heigh is %d feet,%d inches",5,11];
NSLog(height);
//length 返回字符串中字符的個(gè)數(shù)。－（unsigned int) length;
if([height length]>5){
NSLog(@"height length ------");
}
//字符串比較
/**
isEqualToString :可以用來比較接收方和當(dāng)作參數(shù)傳遞來的字符串的內(nèi)容是否相同，返回yes和no
*/
NSString *thing1=@"hello";
NSString *thing2=[[NSString alloc] initWithString:@"hello"];
if([thing1 isEqualToString:thing2]){
NSLog(@"they are same");
}
/**
==:只判斷指針數(shù)值，而不是它們所指向的內(nèi)容
*/
if(thing1==thing2){
NSLog(@"== same");
}
/*
compare:比較兩個(gè)字符串。區(qū)分大小寫
compare將接收對(duì)象和傳遞來的字符串逐個(gè)字符的進(jìn)行比較，它返回一個(gè)NSComparisonResult(枚舉類型)來顯示結(jié)果。
typedef enum _NSComparisonResult{
NSOrderedAscending=-1;
NSOrderedsame;
NSOrderedDescending;
} NSComparisonResult;
*/
[thing1 compare:thing2];
if(NSOrderedSame==[thing1 compare:thing2]){
NSLog(@"compare same");
}
//compare：options:
/***
-(NSComparisonResult) compare:(NSString *) string
options:(unsinged) mask;
options 是一個(gè)位掩碼，可以使用|添加選項(xiàng)標(biāo)記
選項(xiàng)：
NSCaseInsensitiveSearch:不區(qū)分大小寫字符
NSLiteralSearch:進(jìn)行完全比較，區(qū)分大小寫
NSNumbericSearch:比較字符串的字符個(gè)數(shù)，而不是字符值
*/
if([thing1 compare:thing2 options:NSCaseInsensitiveSearch|
NSNumericSearch]==NSOrderedSame){
NSLog(@"they match");
}
/**
以某個(gè)字符串開始或結(jié)尾
-(BOOL) hasPrefix:(NSString *) aString;
-(BOOL) hasSuffix:(NSString *) aString;
*/
NSString *fileName=@"aabbbcc";
if([fileName hasPrefix:@"aa"]){
NSLog(@"begin with aa");
}
if([fileName hasSuffix:@"cc"]){
NSLog(@"end with cc");
}
//NSMutableString 可變字符串
//SString 是不可變的，一旦NSString 被創(chuàng)建了，我們就不能改變它。
//+(id) stringWithCapacity:(unsinged) capacity; capacity:是給NSMutableString的一個(gè)建議，字符串的大小并不局限于所提供的大小，這個(gè)容量?jī)H是個(gè)最優(yōu)值。
NSMutableString *str=[NSMutableString stringWithCapacity:40];
[str appendFormat:@"sdfsdf%d",5];
[str appendString:@"ssssssss"];
NSLog(str);
//刪除字符串
//-(void) deleteCharactersInRange:(NSRange) range;
NSMutableString *ms;
ms=[NSMutableString stringWithCapacity:50];
[ms appendString:@"aabbccdd"];
NSRange range;
range=[ms rangeOfString:@"cc"];
[ms deleteCharactersInRange:range];
NSLog(ms);
//與實(shí)例方法一樣，繼承對(duì)類方法也同樣適用
//------------------集合－－－－－－－－－－－－－－
//NSArray ,NSDictionary
/**
NSArray 是一個(gè)cocoa類，用來存儲(chǔ)對(duì)象的有序列表。
NSArray有兩個(gè)限制：1，它只能存儲(chǔ)objective－c的對(duì)象，而不能存儲(chǔ)c語言中的基本數(shù)據(jù)類型如int，float，enum，struct，或者nsarray中的隨機(jī)指針。2，不能這nsarray中存儲(chǔ)nil
類方法：
arrayWithObjects:創(chuàng)建一個(gè)新的nsarray。發(fā)送一個(gè)以逗號(hào)分割的對(duì)象列表，這列表結(jié)尾添加nil代表列表結(jié)束，（這就是不能這nsarray中存儲(chǔ)nil的原因）
*/
NSArray *array=[NSArray arrayWithObjects:@"aa",@"bb",@"cc",nil];
//-(unsigned) count; 取得包含對(duì)象的個(gè)數(shù)
//-(id) objectAtIndex:(unsigned int) index; 取得索引位置的對(duì)象
int i;
for (i=0; i<[array count]; i++) {
NSLog(@"index %d has %@",i,[array objectAtIndex:i]);
}
//------------切分?jǐn)?shù)組
//-componentsSeparatedByString:
NSString *ns=@"sdf,dsfs,dfd,fdf,df,dd";
NSArray *comArr=[ns componentsSeparatedByString:@","];
for(int i=0;i<[comArr count];i++){
NSLog(@"componentsSeparatedByString===%@",[comArr objectAtIndex:i]);
}
//componentJoinedByString: 合并nsarray中的元素來創(chuàng)建字符串
NSString *joinedStr=[comArr componentsJoinedByString:@"-->"];
NSLog(@"joined---= %@",joinedStr);
//可變數(shù)組
NSMutableArray *mutableArr=[NSMutableArray arrayWithCapacity:40];
[mutableArr addObject:@"aa"];
[mutableArr addObject:@"bb"];
[mutableArr addObject:@"cc"];
[mutableArr addObject:@"dd"];
for(int i=0;i<[mutableArr count];i++){
NSLog(@"mutableArr==%@",[mutableArr objectAtIndex:i]);
}
//-----? -(void) removeObjectAtIndex:(unsinged) index; 刪除指定索引的對(duì)象,
//刪除一個(gè)對(duì)象之后，數(shù)組中并沒有留下漏洞，被刪除對(duì)象后面的數(shù)組元素的哦被前移來填補(bǔ)空缺
[mutableArr removeObjectAtIndex:2];
for(int i=0;i<[mutableArr count];i++){
NSLog(@"removeObjectAtIndex == %@",[mutableArr objectAtIndex:i]);
}
//枚舉
//NSEnumerator ,它是cocoa用來描述這種集合迭代運(yùn)輸?shù)姆椒?/p>
//-(NSEnumerator *) objectEnumerator;
NSEnumerator *enumerator=[mutableArr objectEnumerator];
id thingie;
while(thingie=[enumerator nextObject]){
NSLog(@"i found %@",thingie);
}
//快速枚舉
for(NSString *string in mutableArr){
NSLog(@"for in == %@",string);
}
//NSDictionary 字典
/*
NSDictionary 是在給定的關(guān)鍵字（通常是一個(gè)NSString字符串）下存儲(chǔ)一個(gè)數(shù)值（可以是任何類型的對(duì)象）。然后你可以用這個(gè)關(guān)鍵字來查找相應(yīng)的數(shù)值。
NSDictionary 是鍵查詢的優(yōu)化存儲(chǔ)方式。它可以立即找出要查詢的數(shù)據(jù)，而不需要遍歷整個(gè)數(shù)組進(jìn)行查找。
＋（id) dictionaryWithObjectAndKeys:(id) firstObject,....;
該方法接收對(duì)象和關(guān)鍵字交替出現(xiàn)的系列，以nil值作為終止符號(hào)。
**/
NSDictionary *dic=[NSDictionary dictionaryWithObjectsAndKeys:@"aaa",@"a",@"bbb",@"b",nil];
NSString *dicStr=[dic objectForKey:@"a"];
if([dicStr isEqualToString:@"aaa"]){
NSLog(@"------------00000000000000000");
}
//可變字典
NSMutableDictionary *mutableDic=[NSMutableDictionary dictionaryWithCapacity:50];
[mutableDic setObject:@"1111" forKey:@"1"];
[mutableDic setObject:@"222" forKey:@"2"];
//刪除 -(void) removeObjectForKe:(id) key;
[mutableDic removeObjectForKey:@"2"];
NSArray *keyArr=[mutableDic allKeys];
for(NSString *str in keyArr){
NSLog(@"key== %@",str);
NSLog(@"value== %@",[mutableDic objectForKey:str]);
}
//各種數(shù)值，NSNumber NSValue
/*
cocoa 提供了NSNumber類來包裝基本數(shù)據(jù)類型
+(NSNumber *) numberWithChar:(char) value;
+(NSNumber *) numberWithInt:(int) value;
+(NSNumber *) numberWithFloat:(float) value;
+(NSNumber *) numberWthiBool:(BOOL) value;
-(char) charValue;
-(int) intVlaue;
-(float) floatValue;
-(BOOL) boolValue;
-(NSString *) stringValue;
**/
NSNumber *number;
number=[NSNumber numberWithInt:3];
[mutableDic setObject:number forKey:@"int"];
int num=[[mutableDic objectForKey:@"int"] intValue];
NSLog(@"int object value== %d",num);
//NSValue .NSNumber實(shí)際上是NSValue的子類，NSValue可以包裝任意值
/**
+(NSValue *) valueWithBytes:(const void *) value objCType:(const char *) type;
傳遞的參數(shù)是你想要包裝的數(shù)值的地址，通常，得到的是你想要存儲(chǔ)的變量的地址（在c語言里適用操作符 & ），你也可以提供一個(gè)描述這個(gè)數(shù)據(jù)類型的字符串，通常用來說明struct中實(shí)體的類型和大小。你不用自己寫代碼
來生成這個(gè)字符串，@encode編譯器指令可以接受數(shù)據(jù)類型的名稱并為你生成合適的字符串
*/
NSRect rect= NSMakeRect(1, 2, 30, 40);
NSValue *value;
value=[NSValue valueWithBytes:&rect objCType:@encode(NSRect)];
NSMutableArray *mr=[NSMutableArray arrayWithCapacity:50];
[mr addObject:value];
//getValue 提取數(shù)據(jù)
/**
-(void) getValue:(void *) value; 要傳遞的是存儲(chǔ)這個(gè)數(shù)值的變量的地址
*/
/***
value=[mr objectAtIndex:0];
NSRect r;
NSLog(@"00000 ===%@",r);
[value getValue:&r];
NSLog(@"111== %@",r);
*/
/**
+(NSValue *) valueWithPoint:(NSPoint) point;
+(NSValue *) valueWithSize:(NSSize) size;
+(NSValue *) valueWithRect:(NSRect) rect;
-(NSPoint) pointValue;
-(NSSize) sizeValue;
-(NSRect) rectValue;
*/
//NSNull
/*
*+(NSNull *) null;
*/
[mutableDic setObject:[NSNull null] forKey:@"fax"];
id fax;
fax=[mutableDic objectForKey:@"fax"];
if(fax==[NSNull null]){
NSLog(@"pppppppppppppppppp");
}
[pool drain];
return 0;
}
