iphone-common-codes-ccteam源代码 CCNSString.m

//
//  CCNSString.m
//  CCFC_IPHONE
//
//  Created by  xuchen(陈旭)， xichen(陈曦)， qq：511272827 on 10-11-15.
//  Copyright 2010 cc_team. All rights reserved.
//
 
#include <wchar.h>


#ifdef  __OBJC__
#import "CCNSString.h"
#import "CCLog.h"


@implementation  NSString(cc)


// 获取字符在字符串第一次出现的位置
- (NSInteger)firstIndexOfChar:(unichar)ch
{
        return [self firstIndexOfChar:ch withAppearCount:1];
}


// 获取字符在字符串最后一次出现的位置
- (NSInteger)lastIndexOfChar:(unichar)ch
{
        for(NSInteger i = self.length - 1; i >= 0; i--)
        {
                if(ch == [self characterAtIndex:i])
                {
                        return i;
                }
        }
        
        return -1;              // 没找到
}




// 获取字符在字符串第N次出现的位置
- (NSInteger)firstIndexOfChar:(unichar)ch withAppearCount:(NSInteger)count
{
        NSInteger appearCount = 0;
        
        for(NSInteger i = 0; i < self.length; i++)
        {
                if(ch == [self characterAtIndex:i])
                {
                        appearCount++;
                        if(appearCount == count)
                        {
                                return i;
                        }
                }
        }
        
        return -1;              // 没找到
}


- (NSString *)returnTrimmed
{
    NSMutableString *temp = [NSMutableString stringWithString:self];
    [temp trim];
    return temp;
}


// 根据字符串的字体大小获取字符串的像素长度
- (CGFloat)getStrPixelLenByFontSize:(CGFloat)fontSize
{
        CGSize size = [self sizeWithFont:[UIFont systemFontOfSize:fontSize]];
        return size.width;
}


// 根据字符串的字体大小获取字符串的像素高度
- (CGFloat)getStrPixelHeightByFontSize:(CGFloat)fontSize
{
        CGSize size = [self sizeWithFont:[UIFont systemFontOfSize:fontSize]];
        return size.height;
}


// 获取字符串中字符下标从前到后，总长度小于等于指定像素长度的最大下标的值
- (NSInteger)getMaxIndexLessEqualToLen:(CGFloat)fontSize maxLen:(CGFloat)maxLen
{
        CGFloat sumLen = 0;
        for(NSInteger i = 0; i < self.length; i++)
        {
                NSString *temp = [self substringWithRange:NSMakeRange(i, 1)];   // 获取当前1个字符对应的字符串
                CGFloat currentCharPixelLen = [temp getStrPixelLenByFontSize:fontSize];
                
                sumLen += (CGFloat)currentCharPixelLen;         // 累计当前的总长度
                if(sumLen > maxLen)
                {
                        return i - 1;
                }
                else if(sumLen == maxLen)
                {
                        return i;
                }
                else 
                {
                        continue;
                }
        }
        
        return self.length - 1;
}


// print each unichar   
- (void)print
{
        for(int i = 0; i < [self length]; ++i)
                NSLog(@"%C", [self characterAtIndex:i]);
}


// returns the system library path of the indicate name
- (NSString *)systemLibraryPath
{
        return [NSString stringWithFormat:
                @"/System/Library/Frameworks/%@.framework/%@", self, self];
}


// returns the empty string
+ (NSString *)emptyString
{
        return @"";
}


// returns the text char count of the string, eg, SMS's character count
- (int)calculateTextCharCount
{
        float number = 0.0;


        for(int i = 0; i < [self length]; ++i)
        {
                NSString *str = [self substringWithRange:NSMakeRange(i, 1)];
                LOG_STR(str);
                if([str lengthOfBytesUsingEncoding:NSUTF8StringEncoding] == 3)
                {
                        LOG_DOUBLE(number);
                        number++;
                }
                else
                {
                        LOG_DOUBLE(number);
                        number = number + 0.5;
                }
        }
        
        return ceil(number);    
}


// returns the trimmed string that be trimmed not only in the beginning and end, also in the middle of the string
- (NSString *)returnTrimmedEntile
{
        NSCharacterSet *charSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
        return [self stringByTrimmingCharactersInSet:charSet];
}


// returns whether it contains the str
- (BOOL)containsStr:(NSString *)str
{
        return ([self rangeOfString:str].location != NSNotFound);
}


// returns whether the string is in strArr(whether the strArr contains at least one string that is equalToString self)
- (BOOL)stringInArr:(NSArray *)strArr
{
        for(NSString *temp in strArr)
                if([self isEqualToString:temp])
                        return TRUE;
        return FALSE;
}


@end




@implementation NSMutableString(cc)


- (void)trimBegin
{
        int i;
        for(i = 0; i < self.length; i++)
        {
                unichar ch = [self characterAtIndex:i];
                if(!iswspace(ch))
                {
                        break;
                }
        }
        
        if(0 == i)
        {
                return;
        }
        
        [self deleteCharactersInRange:NSMakeRange(0, i)];
}


- (void)trimEnd
{
        int i;
        for(i = self.length - 1; i >= 0; i--)
        {
                unichar ch = [self characterAtIndex:i];
                if(!iswspace(ch))
                {
                        break;          //从后朝前找到不是空白字符的位置
                }
        }
        
        if(i == self.length - 1)
        {
                return;
        }
        
        NSUInteger loc = i + 1;
        [self deleteCharactersInRange:NSMakeRange(loc, self.length - loc)];
}


- (void)trim
{
        [self trimBegin];
        [self trimEnd];
}


// same to trim func, but call system function
- (void)trimByCallSystemFunc
{
        CFStringTrimWhitespace((CFMutableStringRef)self); 
}


@end


#endif  //__OBJC__

 

可能有更新:

googlecode链接地址：http://code.google.com/p/iphone-common-codes-ccteam/source/browse/trunk/CCFC/files/CCNSString.m

github地址: https://github.com/cxsjabc/iphone-common-codes-ccteam/tree/master/CCFC/files/CCNSString.m