//一、NSString
/*----------------建立字元串的方法----------------*/
//1、建立常量字元串。
NSString *astring = @"This is a String!";
//2、建立空字元串，給予指派。
NSString *astring = [[NSString alloc] init];
astring = @"This is a String!";
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!"];
[astring release];
//4、用标準c建立字元串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
//5、建立格式化字元串:占位符（由一個%加一個字元組成）
int i = 1;
int j = 2;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
//6、建立臨時字元串
NSString *astring;
astring = [NSString stringWithCString:"This is a temporary string"];
/*----------------從檔案讀取字元串:initWithContentsOfFile方法 ----------------*/
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
/*----------------寫字元串到檔案:writeToFile方法 ----------------*/
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
/*---------------- 比較兩個字元串----------------*/
//用C比較:strcmp函數
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傳回的三種值)
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame 判斷兩者内容是否相同
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
//NSOrderedAscending 判斷兩對象值的大小(按字母順序進行比較，astring02大于astring01為真)
NSString *astring01 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
NSLog(@"result:%d",result);
//NSOrderedDescending 判斷兩對象值的大小(按字母順序進行比較，astring02小于astring01為真)
//不考慮大 小寫比較字元串1
BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
//NSOrderedDescending判斷兩對象值的大小(按字母順序進行比較，astring02小于astring01為 真)
//不考慮大小寫比較字元串2
BOOL result = [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
//NSCaseInsensitiveSearch:不區分大小寫比較 NSLiteralSearch:進行完全比較，區分大小寫 NSNumericSearch:比較字元串的字元個數，而不是字元值。
/*----------------改變字元串的大小寫----------------*/
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
/*----------------在串中搜尋子串 ----------------*/
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]];
/*----------------抽取子串 ----------------*/
//-substringToIndex: 從字元串的開頭一直截取到指定的位置，但不包括該位置的字元
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置開始（包括指定位置的字元），并包括之後的全部字元
NSString *string2 = [string1 substringFromIndex:3];
//-substringWithRange: //按照所給出的位置，長度，任意地從字元串中截取子串
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
//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);
@"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];
/*--------------------------- 切分數組------------------------------*/
//從字元串分割到數組－ componentsSeparatedByString:
NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string);
NSArray *array = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[string release];
//從數組合并元素到字元串- componentsJoinedByString:
NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSString *string = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
/************************************************************************
NSMutableArray
*************************************************************************/
/*--------------- 給數組配置設定容量----------------*/
//NSArray *array;
array = [NSMutableArray arrayWithCapacity:20];
/*-------------- 在數組末尾添加對象----------------*/
//- (void) addObject: (id) anObject;
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array addObject:@"Four"];
/*-------------- 删除數組中指定索引處對象----------------*/
//-(void) removeObjectAtIndex: (unsigned) index;
[array removeObjectAtIndex:1];
/*------------- 數組枚舉---------------*/
//- (NSEnumerator *)objectEnumerator;從前向後
enumerator = [array objectEnumerator];
id thingie;
while (thingie = [enumerator nextObject]) {
NSLog(@"thingie:%@",thingie);
//- (NSEnumerator *)reverseObjectEnumerator;從後向前
enumerator = [array reverseObjectEnumerator];
id object;
while (object = [enumerator nextObject]) {
NSLog(@"object:%@",object);
//快速枚舉
for(NSString *string in array)
NSLog(@"string:%@",string);
/*****************************************************************************
NSDictionary
***************************************************************************/
/*------------------------------------建立字典 ------------------------------------*/
//- (id) initWithObjectsAndKeys;
//NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
NSString *string = [dictionary objectForKey:@"One"];
NSLog(@"dictionary:%@",dictionary);
[dictionary release];
/********************************************************************************
NSMutableDictionary
********************************************************************************/
/*------------------------------------建立可變字典 ------------------------------------*/
//建立
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"];
//删除指定的字典
[dictionary removeObjectForKey:@"3"];
/******************************************************************************
NSValue（對任何對象進行包裝）
****************************************************************************/
/*--------------------------------将NSRect放入NSArray中 ------------------------------------*/
//将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];
//從Array中 提取
value = [array objectAtIndex:0];
[value getValue:&rect];
NSLog(@"value:%@",value);
/**************************************************************************
從目錄搜尋擴充名為jpg的檔案
*****************************************************************************/
//NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *home;
home = @"../Users/";
NSDirectoryEnumerator *direnum;
direnum = [fileManager enumeratorAtPath: home];
NSMutableArray *files = [[NSMutableArray alloc] init];
NSString *filename;
while (filename = [direnum nextObject]) {
if([[filename pathExtension] hasSuffix:@"jpg"]){
[files addObject:filename];
}
//擴充路徑
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//檔案擴充名
NSLog(@"Extension:%@",[Path pathExtension]);
/***********************************************************************
NSMutableString
***********************************************************************/
/*---------------給字元串配置設定容量----------------*/
//stringWithCapacity:
NSMutableString *String;
String = [NSMutableString stringWithCapacity:40];
/*---------------在已有字元串後面添加字元----------------*/
//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);
*/
/*-------- 在已有字元串中按照所給出範圍和長度删除字元------*/
/*
//deleteCharactersInRange:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 deleteCharactersInRange:NSMakeRange(0, 5)];
NSLog(@"String1:%@",String1);
/*--------在已有字元串後面在所指定的位置中插入給出的字元串------*/
//-insertString: atIndex:
[String1 insertString:@"Hi! " atIndex:0];
/*--------将已有的空符串換成其它的字元串------*/
//-setString:
[String1 setString:@"Hello Word!"];
/*--------按照所給出的範圍，和字元串替換的原有的字元------*/
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
/*-------------判斷字元串内是否還包含别的字元串(字首，字尾)-------------*/
//01： 檢查字元串是否以另一個字元串開頭- (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： 查找字元串某處是否包含其它字元串 - (NSRange) rangeOfString: (NSString *) aString，這一點前面在串中搜尋子串用到過;
NSArray
****************************************************************************/
/*---------------------------建立數組 ------------------------------*/
//NSArray *array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
self.dataArray = array;
[array release];
//- (unsigned) Count;數組所包含對象個數；
NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
//- (id) objectAtIndex: (unsigned int) index;擷取指定索引處的對象;
NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
/*-------------------------- 從一個數組拷貝資料到另一數組(可變數級)----------------------------*/
//arrayWithArray:
//NSArray *array1 = [[NSArray alloc] init];
NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
NSArray *array = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
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];
for(int i = 0; i < [oldArray count]; i++)
{
obj = [[oldArray objectAtIndex:i] copy];
//
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
for(id obj in oldArray)
[newArray release];
//Deep copy
NSLog(@"oldArray:%@",oldArray);
newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
//Copy and sort
轉載:http://www.cnblogs.com/zhw511006/archive/2010/09/14/1825648.html
本文轉自新風作浪 51CTO部落格，原文連結：http://blog.51cto.com/duxinfeng/1208783，如需轉載請自行聯系原作者
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