//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);

//

NSString *astring = [[NSString alloc] init];

NSLog(@"0x%.8x", astring);

astring=@"This is a String!";

NSLog(@"0x%.8x", astring);

[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);
 

//7、从文件创建字符串

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

//8、用字符串创建字符串,并写入到文件

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

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

NSString *path = @"astring.text";    

[astring writeToFile: path atomically: YES];

[astring release];  

注:此路径path只只是示意,真实路径并非如此

 
//9、用C比较:strcmp函数
char string1[] = "string!";

char string2[] = "string!";

if(strcmp(string1, string2) == 0)
{ NSLog(@"1"); }
 

//10、isEqualToString方法

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

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

BOOL result = [astring01 isEqualToString:astring02];

NSLog(@"result:%d",result);
 

//11、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; //NSOrderedSame判断两者内容是否相同 NSLog(@"result:%d",result); //
NSString *astring01 = @"This is a String!"; NSString *astring02 = @"this is a String!"; BOOL result = [astring01 compare:astring02] == NSOrderedAscending; //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) NSLog(@"result:%d",result); //
NSString *astring01 = @"this is a String!"; NSString *astring02 = @"This is a String!"; BOOL result = [astring01 compare:astring02] == NSOrderedDescending; //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) NSLog(@"result:%d",result);
 

//12、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; //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) NSLog(@"result:%d",result); //2.
NSString *astring01 = @"this is a String!"; NSString *astring02 = @"This is a String!"; BOOL result = [astring01 compare:astring02 options:NSCaseInsensitiveSearch | NSNumericSearch] == NSOrderedSame; //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。 NSLog(@"result:%d",result);
 
//13、输出大写或者小写字符串
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
 

//14、-rangeOfString: //查找字符串某处是否包含其它字符串

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];
 

//15、-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);
 

//16、-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);
 

//17、-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);
 

//18、-stringWithCapacity: //按照固定长度生成空字符串

NSMutableString *String;

String = [NSMutableString stringWithCapacity:40];
 

//19、-appendString: and -appendFormat: //把一个字符串接在另一个字符串的末尾

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);
 

//20、-insertString: atIndex: //在指定位置插入字符串

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

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

NSLog(@"String1:%@",String1);
 

//21、-setString:

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

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

NSLog(@"String1:%@",String1);
 

//22、-replaceCharactersInRange: withString: //用指定字符串替换字符串中某指定位置、长度的字符串

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

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

NSLog(@"String1:%@",String1);
 

//23、-hasPrefix: //检查字符串是否以另一个字符串开头

NSString *String1 = @"NSStringInformation.txt";

[String1 hasPrefix:@"NSString"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");

[String1 hasSuffix:@".txt"] = = 1 ?  NSLog(@"YES") : NSLog(@"NO");
 
//24、扩展路径
NSString *Path = @"~/NSData.txt";

NSString *absolutePath = [Path stringByExpandingTildeInPath];

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

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

//25、文件扩展名

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

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

NSString的常见方法的更多相关文章

  1. NSString 的常见方法

    NSString的常用方法 创建一个新字符串并将其设置为 path 指定的文件的内容,使用字符编码enc,在error上返回错误 + (id)stringWithContentsOfURL:(NSUR ...

  2. iOS-NSString常见方法

    </pre><pre name="code" class="html">#import <Foundation/Foundatio ...

  3. UIPickerView常见属性、常见方法(包括代理方法和数据源方法)的一些说明

    一.UIPickerView 1.UIPickerView的常见属性 // 数据源(用来告诉UIPickerView有多少列多少行) @property(nonatomic,assign) id< ...

  4. C#图片处理常见方法性能比较

    C#图片处理常见方法性能比较 来自:http://www.cnblogs.com/sndnnlfhvk/archive/2012/02/27/2370643.html   在.NET编程中,由于GDI ...

  5. window对象中的常见方法

    <body><!-- window对象中的常见方法--><script type="text/javascript"> var timeid; ...

  6. python socket 常见方法及 简单服务/客户端

    socket 常见方法: 补充说明:what is file descriptor? 文件描述符是什么? 参考(http://stackoverflow.com/questions/8191905/w ...

  7. VBS操作Excel常见方法

    VBS操作Excel常见方法 作者: 字体:[增加 减小] 类型:转载 时间:2009-11-13我要评论 VBS控制Excel常见方法,需要的朋友可以参考下. dim oExcel,oWb,oShe ...

  8. jQuery ajax调用后台aspx后台文件的两种常见方法(不是ashx)

    在asp.net webForm开发中,用Jquery ajax调用aspx页面的方法常用的有两种:下面我来简单介绍一下. [WebMethod] public static string SayHe ...

  9. AJAX跨域的常见方法

    由于在工作中需要使用AJAX请求其他域名下的请求,但是会出现拒绝访问的情况,这是因为基于安全的考虑,AJAX只能访问本地的资源,而不能跨域访问.比如说你的网站域名是aaa.com,想要通过AJAX请求 ...

随机推荐

  1. 使用jQuery实现类似开关按钮的效果

    转自:http://www.cnblogs.com/linjiqin/p/3148228.html 本案例实现类似开关按钮效果. 页面有下拉列表.文本框.按钮等表单元素,大致实现如下效果:1.页面一加 ...

  2. loadrunner中创建唯一随机数

    常用的时间唯一脚本: Action() { int id, scid; char *vuser_group,strid[5];       char proposalNo[1024]; int i; ...

  3. ural 1283. Dwarf

    1283. Dwarf Time limit: 1.0 secondMemory limit: 64 MB Venus dwarfs are rather unpleasant creatures: ...

  4. Counting Squares[HDU1264]

    Counting Squares Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) ...

  5. 过滤html字符的方法

    昨天在看公司网站的产品详细页面,发现只有一个公司的JS产品轮换特效不会出,找了半天,程序都是一样的,原因是什么呢?原来是公司的别名是xiandahg,里面含有and字符被过滤掉了. public st ...

  6. 【转载】Erlang 中 link 和 monitor 的区别

    Link and Monitor differences 原文地址 Introduction link/1 and monitor/2 are 2 different ways of notifyin ...

  7. C Memory Layout C语言中的内存布局

    在C语言中,内存的主要分为下列几部分: 1. Text/Code Segment 文本/代码区 2. Initialized Data Segments 初始化的数据区 3. Uninitialize ...

  8. SQL中的charindex()方法

    CHARINDEX函数返回字符或者字符串在另一个字符串中的起始位置.CHARINDEX函数调用方法如下: CHARINDEX ( expression1 , expression2 [ , start ...

  9. IOS第四天(6:答题区按钮点击和乱序)

    #pragma mark - 答题区按钮点击方法 - (void)answerClick:(UIButton *)button { // 1. 如果按钮没有字,直接返回 ) return; // 2. ...

  10. SecureCRT通过console口连接思科设备