Objective C HTML 转义/转义 [英] Objective C HTML escape/unescape

问题描述

想知道是否有一种简单的方法可以在 Objective C 中进行简单的 HTML 转义/转义.我想要的是这样的伪代码:

Wondering if there is an easy way to do a simple HTML escape/unescape in Objective C. What I want is something like this psuedo code:

NSString *string = @"<span>Foo</span>";
[string stringByUnescapingHTML];

哪个返回

<span>Foo</span>

希望对所有其他 HTML 实体以及甚至 ASCII 代码(如 Ӓ 等)进行转义.

Hopefully unescaping all other HTML entities as well and even ASCII codes like Ӓ and the like.

Cocoa Touch/UIKit 中是否有任何方法可以做到这一点?

Is there any methods in Cocoa Touch/UIKit to do this?

推荐答案

这个 链接 包含以下解决方案.Cocoa CF 具有 CFXMLCreateStringByUnescapingEntities 函数，但在 iPhone 上不可用.

This link contains the solution below. Cocoa CF has the CFXMLCreateStringByUnescapingEntities function but that's not available on the iPhone.

@interface MREntitiesConverter : NSObject <NSXMLParserDelegate>{
    NSMutableString* resultString;
}

@property (nonatomic, retain) NSMutableString* resultString;

- (NSString*)convertEntitiesInString:(NSString*)s;

@end


@implementation MREntitiesConverter

@synthesize resultString;

- (id)init
{
    if([super init]) {
        resultString = [[NSMutableString alloc] init];
    }
    return self;
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)s {
        [self.resultString appendString:s];
}

- (NSString*)convertEntitiesInString:(NSString*)s {
    if (!s) {
        NSLog(@"ERROR : Parameter string is nil");
    }
    NSString* xmlStr = [NSString stringWithFormat:@"<d>%@</d>", s];
    NSData *data = [xmlStr dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
    NSXMLParser* xmlParse = [[[NSXMLParser alloc] initWithData:data] autorelease];
    [xmlParse setDelegate:self];
    [xmlParse parse];
    return [NSString stringWithFormat:@"%@",resultString];
}

- (void)dealloc {
    [resultString release];
    [super dealloc];
}

@end

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