Objective C HTML转义/转义

Question

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

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

哪个返回

<span>Foo</span>

希望也转义所有其他HTML实体，甚至ASCII码（例如Ӓ等）。

Cocoa Touch / UIKit中有什么方法可以做到这一点？

Answer 1

包含以下解决方案。可可CF具有CFXMLCreateStringByUnescapingEntities函数，但在iPhone上不可用。

@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