给NSString增加Java风格的方法

转载自：http://www.udpwork.com/item/7238.html

源代码连接：https://github.com/tangqiaoboy/xcode_tool

NSStringEx.h

//
//  NSStringEx.h
//  NSStringEx
//
//  Created by Tang Qiao on 12-2-4.
//  Copyright (c) 2012年 blog.devtang.com. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSString(NSStringEx)

/**
 * Return the char value at the specified index~
 */
-(unichar) charAt:(int)index;

/**
 * Compares two strings lexicographically.
 * the value 0 if the argument string is equal to this string;
 * a value less than 0 if this string is lexicographically less than the string argument;
 * and a value greater than 0 if this string is lexicographically greater than the string argument.
 */
-(int) compareTo:(NSString*) anotherString;

-(int) compareToIgnoreCase:(NSString*) str;

-(BOOL) contains:(NSString*) str;

-(BOOL) startsWith:(NSString*)prefix;

-(BOOL) endsWith:(NSString*)suffix;

-(BOOL) equals:(NSString*) anotherString;

-(BOOL) equalsIgnoreCase:(NSString*) anotherString;

-(int) indexOfChar:(unichar)ch;

-(int) indexOfChar:(unichar)ch fromIndex:(int)index;

- (int) indexOfString:(NSString*)str;

-(int) indexOfString:(NSString*)str fromIndex:(int)index;

-(int) lastIndexOfChar:(unichar)ch;

-(int) lastIndexOfChar:(unichar)ch fromIndex:(int)index;

-(int) lastIndexOfString:(NSString*)str;

-(int) lastIndexOfString:(NSString*)str fromIndex:(int)index;

-(NSString*) substringFromIndex:(int)beginIndex toIndex:(int)endIndex;

-(NSString*) toLowerCase;

-(NSString*) toUpperCase;

-(NSString*) trim;

-(NSString*) replaceAll:(NSString*)origin with:(NSString*)replacement;

-(NSArray*) split:(NSString*) separator;

@end

NSStringEx.m

//
//  NSStringEx.m
//  NSStringEx
//
//  Created by Tang Qiao on 12-2-4.
//  Copyright (c) 2012年 blog.devtang.com. All rights reserved.
//

#import "NSStringEx.h"

@implementation NSString(NSStringEx)

#define JavaNotFound -1

/**  Java-like method. Returns the char value at the specified index. */
-(unichar) charAt:(int)index {
    return [self characterAtIndex:index];
}

/**
 * Java-like method. Compares two strings lexicographically.
 * the value 0 if the argument string is equal to this string;
 * a value less than 0 if this string is lexicographically less than the string argument;
 * and a value greater than 0 if this string is lexicographically greater than the string argument.
 */
-(int) compareTo:(NSString*) anotherString {
    return [self compare:anotherString];
}

/** Java-like method. Compares two strings lexicographically, ignoring case differences. */
-(int) compareToIgnoreCase:(NSString*) str {
    return [self compare:str options:NSCaseInsensitiveSearch];
}

/** Java-like method. Returns true if and only if this string contains the specified sequence of char values. */
-(BOOL) contains:(NSString*) str {
    NSRange range = [self rangeOfString:str];
    return (range.location != NSNotFound);
}

-(BOOL) startsWith:(NSString*)prefix {
    return [self hasPrefix:prefix];
}

-(BOOL) endsWith:(NSString*)suffix {
    return [self hasSuffix:suffix];
}

-(BOOL) equals:(NSString*) anotherString {
    return [self isEqualToString:anotherString];
}

-(BOOL) equalsIgnoreCase:(NSString*) anotherString {
    return [[self toLowerCase] equals:[anotherString toLowerCase]];
}

-(int) indexOfChar:(unichar)ch{
    return [self indexOfChar:ch fromIndex:0];
}

-(int) indexOfChar:(unichar)ch fromIndex:(int)index{
    int len = self.length;
    for (int i = index; i < len; ++i) {
        if (ch == [self charAt:i]) {
            return i;
        }
    }
    return JavaNotFound;
}

-(int) indexOfString:(NSString*)str {
    NSRange range = [self rangeOfString:str];
    if (range.location == NSNotFound) {
        return JavaNotFound;
    }
    return range.location;
}

-(int) indexOfString:(NSString*)str fromIndex:(int)index {
    NSRange fromRange = NSMakeRange(index, self.length - index);
    NSRange range = [self rangeOfString:str options:NSLiteralSearch range:fromRange];
    if (range.location == NSNotFound) {
        return JavaNotFound;
    }
    return range.location;
}

-(int) lastIndexOfChar:(unichar)ch {
    int len = self.length;
    for (int i = len-1; i >=0; --i) {
        if ([self charAt:i] == ch) {
            return i;
        }
    }
    return JavaNotFound;
}

-(int) lastIndexOfChar:(unichar)ch fromIndex:(int)index {
    int len = self.length;
    if (index >= len) {
        index = len - 1;
    }
    for (int i = index; i >= 0; --i) {
        if ([self charAt:i] == ch) {
            return index;
        }
    }
    return JavaNotFound;
}

-(int) lastIndexOfString:(NSString*)str {
    NSRange range = [self rangeOfString:str options:NSBackwardsSearch];
    if (range.location == NSNotFound) {
        return JavaNotFound;
    }
    return range.location;
}

-(int) lastIndexOfString:(NSString*)str fromIndex:(int)index {
    NSRange fromRange = NSMakeRange(0, index);
    NSRange range = [self rangeOfString:str options:NSBackwardsSearch range:fromRange];
    if (range.location == NSNotFound) {
        return JavaNotFound;
    }
    return range.location;
}

-(NSString *) substringFromIndex:(int)beginIndex toIndex:(int)endIndex {
    if (endIndex <= beginIndex) {
        return @"";
    }
    NSRange range = NSMakeRange(beginIndex, endIndex - beginIndex);
    return [self substringWithRange:range];
}

-(NSString *) toLowerCase {
    return [self lowercaseString];
}

-(NSString *) toUpperCase {
    return [self uppercaseString];
}

-(NSString *) trim {
    return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

-(NSString *) replaceAll:(NSString*)origin with:(NSString*)replacement {
    return [self stringByReplacingOccurrencesOfString:origin withString:replacement];
}

-(NSArray *) split:(NSString*) separator {
    return [self componentsSeparatedByString:separator];
}

@end