(M_PI); //将字符串按照+-*/进行分割 NSArray *array=[self.showLabel.text componentSeparatedByCharactersInSet:[NSCharacterSet

NSString *tempString = @"11111111111 2222222222&&3333333333()66666666"; 2 NSCharacterSet

"   str_trim.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())//"

[responseStringisEqualToString:@""]){后面添加以下代码NSCharacterSet*controlChars=[NSCharacterSetcontrolC

NSCharacterSet以及它的可变版本NSMutableCharacterSet,用面向对象的方式表示一组Unicode字符,它经常与NSString及NSScanner组合起来使用,在不同的字符上做过滤

*) stringToConvert { NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet

NSString *) stringToConvert { NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet

去除两端空格 NSString *temp = [textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet

NSCharacterSet *whitespace = [NSCharacterSet  whitespaceAndNewlineCharacterSet]; NSString

RT: 参考代码： NSString *m_tableText = m_accessViewLable.text; NSCharacterSet *whitespace = [NSCharacterSet

nsstring 长度和去掉前后空格的方法   NSString *searchText = [[searchBar text] stringByTrimmingCharactersInSet: [NSCharacterSet

NSString *) stringToConvert { NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet

1、去除字符串中所有的空格 1）使用NSString中的stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]

blog.sina.com.cn/s/blog_5421851501014xif.html 去除 username中的空格，table newline，nextline 代码如下：（三行代码） NSCharacterSet

+(NSString*)validAndFilterMobilePhoneNumber:(NSString*)mobilePhoneNumber{ NSCharacterSet*doNotWant

去除掉首尾的空白字符和换行字符 str = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet

在我们编写程序的时候经常会把数据库中的数据加一过流以供我们的使用，包括电话号码的过滤等等1.一种比较简单的过滤方法NSCharacterSet*doNotWant=[NSCharacterSetcharacterSetWithCharactersInString

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

- (BOOL)isHaveIllegalChar:(NSString *)str{     NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString

和OC中一样，在swift中也可以使用NSCharacterSet类来实现。

#import"NSString+change.h" @implementationNSString(change) -(NSString*)removeSpecilaStr { NSCharacterSet

7.0+[string stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLPathAllowedCharacterSet

也就是说这段json中有特殊字符的意思，解决办法呢，就是把这些字符去掉，有如下解决方案：-(NSString*)removeUnescapedCharacter:(NSString*)inputStr{NSCharacterSet

NSCharacterSet  正如之前提前过的，基础类库（Foundation）拥有最好的、功能也最全的string类的实现。但是仅当程序员熟练掌握它时，一个string的实现才是真的好。

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

main.m 1 #import <Foundation/Foundation.h> 2 #import "NSString+Trim.h" 3 int main(int argc, const char * argv[]) { 4 @autoreleasepool { 5 NSString *strSource = @

alpha:(CGFloat)alpha {     //删除字符串中的空格     NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet

colorWithHexString: (NSString *)color  {      NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet

1.NSCharacterSet其实是许多字符或者数字或者符号的组合,用NSCharacterSet处理字符串//NSCharacterSet其实是许多字符或者数字或者符号的组合，在网络处理的时候会用到

定义一个无符号整型两个字节范围[0,65535]typedefunsignedshortunichar;//1.提前进入以下六个类告诉编译器，六个都是类的名称@classNSData,NSArray,NSDictionary,NSCharacterSet

//判断字符串是否为空 functrimString(#str:String)->String{ varnowStr=str.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet

去除首尾空格：NSString *content = [textView.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet

colorWithHexString: (NSString *)color { NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet

componentsSeparatedByString:(NSString*)separator;//以string作为分割项 -(NSArray*)componentsSeparatedByCharactersInSet:(NSCharacterSet

NSCharacterSetinheritsfrom:NSObjectConformsto:NSObject,NSCoding,NSMutableCopying,NSCopying      ClassMethods:whitespaceCharacterSetReturnsacharactersetcontainingonlythein-linewhitespacecharactersspace

IOS官方文档对NSCharacterset的介绍AnNSCharacterSetobjectrepresentsasetofUnicode-compliantcharacters.NSStringandNSScannerobjectsuseNSCharacterSetobjectstogroupcharacterstogetherforsearchingoperations

SBJson才会有这个提示，系统方法不会提示错误有如下解决方案：//去除未转义的控制字符-(NSString*)removeUnescapedCharacter:(NSString*)inputStr{NSCharacterSet

//textField.text 为你要获取的值 NSString *P_textfield = [textField.text stringByTrimmingCharactersInSet:[NSCharacterSet

. // 去除空白（空格、\n\t\r） NSString *str = [stringValue stringByTrimmingCharactersInSet:[NSCharacterSet

iOS基础类解析-NSCharacterSet太阳火神的美丽人生(http://blog.csdn.net/opengl_es)本文遵循“署名-非商业用途-保持一致”创作公用协议转载请保留此句：太阳火神的美丽人生

"  - (BOOL)CheckInput:(NSString *)string {    NSCharacterSet *cs;     cs = [[NSCharacterSet characterSetWithCharactersInString

     //去掉杂符    NSCharacterSet*otherchar=[NSCharacterSetcharacterSetWithCharactersInString:@"[]{},!

NSString *cleanString = [dirtyString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet

IOS官方文档对NSCharacterset的介绍AnNSCharacterSetobjectrepresentsasetofUnicode-compliantcharacters.NSStringandNSScannerobjectsuseNSCharacterSetobjectstogroupcharacterstogetherforsearchingoperations

SBJson才会有这个提示，系统方法不会提示错误有如下解决方案：//去除未转义的控制字符-(NSString*)removeUnescapedCharacter:(NSString*)inputStr{NSCharacterSet

【问题分析】1、使用NSString中的stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]方法只是去

=[emailrangeOfString:@"."].length))  {    NSCharacterSet*tmpInvalidCharSet=[[NSCharacterSetalphanumericCharacte

1，消除空格和空行[myStringstringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

"; NSCharacterSet*whitespaces=[NSCharacterSetwhitespaceCharacterSet];

UIColor*)colorWithHexString:(NSString*)color{  NSString*cString=[[colorstringByTrimmingCharactersInSet:[NSCharacterSet