iOS NSString,NSMutableString的常用用法
2015-07-10 21:18
543 查看
1.NSString
//1、创建常量字符串。
//2、创建空字符串,给予赋值。
//8、用字符串创建字符串,并写入到文件
//9、用C比较:strcmp函数
//14、-rangeOfString: //查找字符串某处是否包含其它字符串
//24、扩展路径
NSMutableString
基本用法
1.给字符串分配容量
2.在已有字符串后面添加字符
3.在已有字符串中按照所给出范围和长度删除字符
4.在已有字符串后面在所指定的位置中插入给出的字符串
5.将已有的空符串换成其它的字符串
6.按照所给出的范围,和字符串替换的原有的字符
7.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;
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;
//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]);
NSMutableString
基本用法
1.给字符串分配容量
stringWithCapacity: NSMutableString *String; String = [NSMutableString stringWithCapacity:40];
2.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);
3.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);
4.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);
5.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);
6.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);
7.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;
相关文章推荐
- 关于ios6 ios7地图使用权限提示框不弹出的原因
- iOS 多渠道打包的解决方案
- 【iOS发展-49】的插件-插件该文档的凝视VVDocumenter安装与使用
- iOS开发系列--地图与定位
- iOS学习笔记-LocalAuthentication
- IOS - 购买类型视图
- JS判断客户端是否是iOS或者Android
- iOS中多线程原理与runloop介绍
- iOS 中的 NSTimer
- 个人常用iOS第三方库以及XCode插件介绍
- HTML5 隐藏地址栏 兼容IOS 与安卓
- iOS开发--URL中汉字出现乱码
- iOS 进度条,可选择环形或者直线,有无动画
- NSUserDefaults的读写
- WWDC15 Session笔记 - iOS 9 多任务分屏要点
- 开发者所需要知道的 iOS 9 SDK 新特性
- iOS开发--数据存取
- ios 开发之 扫描二维码和生成二维码
- ios 判断控制器是否是第一次进入画页的做法
- ios 开发之获取手机的外网IP和内网IP