NSstring封装

来自http://devtang.com/blog/2012/02/14/nsstring-java-like-wrapper/

NSStringWrapper.h

#import <Foundation/Foundation.h>

@interface NSString(Wrapper)

/**  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

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NSStringWrapper.m

#import "NSStringWrapper.h"

@implementation NSString(Wrapper)

#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