1
//创建字符串对象数组
NSArray *array = [str componentsSeparatedByString:@"@"];//就是以@为标示 输出看看啦
int count=[array count];
int i;
for(i=0;i<count;i=i+4)
{
printf("%i: %s\n",i,[[array objectAtIndex:i] UTF8String]);
}
2 可变的字符串类
NSMutableString *song=[[NSMutableString alloc] init];
[song appendString:@"Deaf Leppard"];
printf("%s\n",[song UTF8String]);
NSRange range=[song rangeOfString:@"Deaf"];//获取字符串"Deaf"字串的范围
[song replaceCharactersInRange:range withString:@"Def"];//替换
printf("%s\n",[song UTF8String]);
[song insertString:@"Animal by " atIndex:0];
printf("%s\n",[song UTF8String]);
[song release];
3
字典加数组操作
NSArray *keys=[@"one two three" componentsSeparatedByString:@" "];
NSArray *value=[@"two bravo a" componentsSeparatedByString:@" "];
NSDictionary *dic=[[NSDictionary alloc] initWithObjects:value forKeys:keys];
printf("%s\n",[[dic description] UTF8String]);
/*******************************************************************************************
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 = [[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、用标准c创建字符串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astring release];
//5、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 %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astring release];
//6、创建临时字符串
NSString *astring;
astring = [NSString stringWithCString:"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 = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------写字符串到文件: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];
/*----------------比较两个字符串----------------*/
//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 = [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!";
BOOL result = [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!";
BOOL result = [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!";
BOOL result = [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!";
BOOL result = [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!";
BOOL result = [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";
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: 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 = [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 = [[NSMutableString alloc] 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 = [[NSMutableString alloc] 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 = [[NSMutableString alloc] 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 = [[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];
//快速枚举
//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];
/*---------------------------切分数组------------------------------*/
//从字符串分割到数组－ componentsSeparatedByString:
NSString *string = [[NSString alloc] 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 = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSString *string = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
/*******************************************************************************************
NSMutableArray
*******************************************************************************************/
/*---------------给数组分配容量----------------*/
NSArray *array;
array = [NSMutableArray arrayWithCapacity: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];
id thingie;
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];
id object;
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 = [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);
//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 = [[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);
//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 = [[NSMutableArray alloc] 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);
//}
相关推荐
利用Objective—C原声API实现数字，字符串，字典，数组对象的排序。
部分详细阐述了Foundation框架，涵盖数字、字符串、集合、文件操作、内存管理、对象复制和归 档等重要内容；第三部分简要介绍了Cocoa和iPhone SDK；第四部分是附录，主要列出了Objective- C的快速参考。 本书结构...
3.3 用于处理分数的Objective-C类 3.4 @interface部分 3.4.1 选择名称 3.4.2 实例变量 3.4.3 类和实例方法 3.5 @implementation部分 3.6 Program部分 3.7 实例变量的访问以及数据封装 3.8 小结 3.9 练习 第4章 数据...
全书共分为四大部分：第一部分全面讲解了Objective-C语言的基础知识，包括类、对象、方法、数据类型、表达式、程序结构、继承、多态、动态类型和动态绑定、函数、数组、结构和指针等；第二部分详细阐述了Foundation...
全书共分为四大部分：第一部分全面讲解了objective-c语言的基础知识，包括类、对象、方法、数据类型、表达式、程序结构、继承、多态、动态类型和动态绑定、函数、数组、结构和指针等；第二部分详细阐述了foundation...
全书共分为四大部分：第一部分全面讲解了Objective-C语言的基础知识，包括类、对象、方法、数据类型、表达式、程序结构、继承、多态、动态类型和动态绑定、函数、数组、结构和指针等；第二部分详细阐述了Foundation...
《Objective-C程序设计》（作者杨正洪、郑齐心、李建国）通过大量的实例系统地介绍了Objective-C语言的基本概念、语法规则、框架、类库及开发环境。读者在阅读本书后，可以掌握Objective-C语言的基本内容，并进行...
包括：类的实现、方法的声明、对象的实例化和使用、变量的声明、控制流、字符串/数组/字典的小例子。 该作品是PDF文件格式请下载 福昕PDF阅读器 SwiftSwift语言是供iOS和OS X应用编程的新编程语言，苹果公司宣称...
BMChineseSort是一个为模型、字典、字符串数组根据特定中文属性基于tableview分组优化的工具类，基于异步、多线程降低排序时间。 对于多音字的问题，开放了一个映射属性，可手动修改个别多音字或你想要的映射关系。 ...
适用于Objective-C的离线反向地理编码器。 将诸如“ SF”之类的字符串转换为具有名称，坐标，时区等的位置对象。不需要互联网连接。 特征 使用字符串或坐标查找位置 无需互联网 在线后备 来自世界各地的结果 快速地...
Swift的20个常问面试题整理： 什么是Swift？...Swift支持多种数据类型，包括整数（Int）、浮点数（Float、Double）、布尔值（Bool）、字符串（String）、数组（Array）、字典（Dictionary）等。
iOS 圆角按钮 BubbleButtonView ,BubbleButtonView 可根据一组字符串数组自动生成圆角的按钮列表，适合用来显示多个标签。
Objective-C和C的API常常会需要用到指针。Swift中的数据类型都原生支持基于指针的Cocoa API，不仅如此，Swift会自动处理部分最常用的将...这篇文章中，我们将着眼于在Swift中让C语言指针与变量、数组和字符串共同工作。
//从字符串中取字节数组(将HEX转换为BCD) +(NSData*)HEXToBCD:(NSString*)string; //将HEX转化为可显示的字符 +(NSString*)HEXToUTF8:(NSString*)string; //将可显示字符转化为HEX +(NSString*)UTF8ToHEX:(NSString*...
因此你在编程时比如你想以字符串形式和计算机交流，那你很容易就能想到在C中可以使用String这个类，在java中也是Stirng （当然，前提是你至少有一种同抽象级别得语言基础），那OC呢，也有这样一个类吧，不过是某种...
只是我喜欢的一个很棒的应用程序）文档从以下文件Xojo字符和像素图像由字符串数组定义，其中每个字符串代表一行。 下面是一个例子： Dim str() As String = Array(_"· · · 1 2 · · · · · ",_"· · · A # #...