iOS之NSStirng使用集合、NSCharacterSet

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1.返回类的字符串或方法名字符串

============2.将array数组转换为string字符串

NSString *tempString = [mutableArray componentsJoinedByString:@","];--以逗号为分隔符

==========3.

NSString *str=[[NSStringalloc]initWithData:responseObjectencoding:NSUTF8StringEncoding];//网页二进制数据转换成字符串

=================3.自定义NSCharacterSet

NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@／：；（）¥「」＂、[]{}#%-*+=_\\|~＜＞$€^•'@#$%^&*()_+'\""];

=====================4.去除字符串中的特殊字符

NSString *temptext = [messageTextField.textstringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceCharacterSet]];//去除两端的空格 NSString *text = [temptext stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet ]];//去除回车。

==============字典转成JSON字符串======

NSDictionary *fukuanjson ;

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:fukuanjson options:NSJSONWritingPrettyPrinted error:nil];

NSString *jsonStr=[[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

===============字符串==========

//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);

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);

//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);

//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);

//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];

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 = [astring01isEqualToString: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);

//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 = [[NSMutableStringalloc]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]);

=======删除字符串中的某个字符========

self.textStore是可变字符串；

NSRange theRange =NSMakeRange(self.textStore.length - 1, 1);

[self.textStoredeleteCharactersInRange:theRange];//删除字符串中的某个字符

===========

iOS 找到字符串中指定的多个字符串的位置

通过查找的方式来(这方式适合所有格式的子符串，推荐使用)

NSString *newStr = @"AbdcdddccddA00"; NSString *temp = nil;

for(int i =0; i < [newStr length]; i++)

{

temp = [newStr substringWithRange:NSMakeRange(i, 1)];

if ([temp isEqualToString:@"A"])

{ NSLog(@"第%d个字是:%@", i, temp);

}

==========吧字符串中的每个字符转换成ASCII码值放入数组==

NSMutableArray *array = [[NSMutableArray alloc] init];
NSString *str = @"password";
NSUInteger len = [str length];
for(NSUInteger i=0; i<len; i++)
{
[array addObject:[NSNumber numberWithChar:[str characterAtIndex:i]]];//数组中存的是ASCII码值

[NSString stringWithFormat:@"%c",[phonenumStr characterAtIndex:i]]；//acii码转换成字符串
}

======遍历字符串的每一个字符====

NSString *string =@"this is my name";

for (int i = 0; i<[string length]; i++) {

//截取字符串中的每一个字符

NSString *s = [string substringWithRange:NSMakeRange(i, 1)];

NSLog(@"string is %@",s);

if ([s isEqualToString:@"m"]) {

NSRange range = NSMakeRange(i, 1);

//将字符串中的“m”转化为“w”

string = [string stringByReplacingCharactersInRange:range withString:@"w"];

}

NSLog(@"%@",string);

=======//取出字符串中的数字=======

//取出字符串中的数字

/** ---------------------------------------------------------------------------*/

第一种:

字符串: urlString

NSScanner *scanner = [NSScanner scannerWithString:urlString];

[scanner scanUpToCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet] intoString:nil];

int number;

[scanner scanInt:&number];

NSString *num=[NSString stringWithFormat:@"%d",number];

/** ---------------------------------------------------------------------------*/

第二种:

字符串: urlString

NSCharacterSet* nonDigits =[[NSCharacterSet decimalDigitCharacterSet] invertedSet];

int remainSecond =[[urlString stringByTrimmingCharactersInSet:nonDigits] intValue];

NSLog(@" num %d ",remainSecond);

=========s'tingappendBystring不起作用后，选择先把字符串分解添加到数组，在拼接数组的元素=====

NSMutableArray *phstrArr=[[NSMutableArrayalloc]init];

NSString *phstr=@"";

NSString *phonenumStr=@“13333358d6”；

NSUInteger len = [phonenumStrlength];

for(NSUInteger i=0; i<len; i++)

{

NSString *c=[NSStringstringWithFormat:@"%c",[phonenumStrcharacterAtIndex:i]];

if([cisEqualToString:@"0"] ||[cisEqualToString:@"1"] ||[cisEqualToString:@"2"] ||[cisEqualToString:@"3"] ||[cisEqualToString:@"4"] ||[cisEqualToString:@"5"] ||[cisEqualToString:@"6"] ||[cisEqualToString:@"7"] ||[cisEqualToString:@"8"] ||[cisEqualToString:@"9"] ){

[phstrArr addObject:c];

NSLog(@"-zifu--%@", [NSString stringWithFormat:@"%c",[phonenumStr characterAtIndex:i]]);

}

phstr=[phstrArr componentsJoinedByString:@""];

NSLog(@"-拼接后--%@",phstr);

============

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