Objective-C Cocoa Touch 中的 HTML 字符解码

objective-c
#import <Foundation/Foundation.h>
@interface NSString (HTMLDecoding)
- (NSString *)stringByDecodingHTMLEntities;
@end
@implementation NSString (HTMLDecoding)
- (NSString *)stringByDecodingHTMLEntities {
    NSMutableString *decodedString = [NSMutableString stringWithString:self];
    
    NSDictionary *entities = @{@"&" : @"&",
                               @"<" : @"<",</p>                               @">" : @">",
                               @""" : @"\"",
                               @"'" : @"'"};
    
    for (NSString *entity in entities) {
        [decodedString replaceOccurrencesOfString:entity
                                        withString:entities[entity]
                                           options:NSLiteralSearch
                                             range:NSMakeRange(0, decodedString.length)];
    }
    
    return decodedString;
}
@end
int mAIn(int argc, const char * argv[]) {
    @autoreleasepool {
        NSString *htmlString = @"<strong>Hello World!</strong>";
        NSString *decodedString = [htmlString stringByDecodingHTMLEntities];
        NSLog(@"%@", decodedString);
    }
    return 0;
}