目标C HTML转义/取消转义 [英] Objective C HTML escape/unescape

问题描述

想知道是否有一个简单的方法来做一个简单的HTML转义/ unescape在Objective C.我想要的是这样的伪装代码：

  NSString * string = @& lt; span& gt; Foo& lt; / span& gt;; 
 [string stringByUnescapingHTML]; 
  

哪些返回

 < span> Foo< / span>希望取消转义所有其他HTML实体，甚至是Ӓ等ASCII码。
 
 > 
 
 
在Cocoa Touch / UIKit中有没有方法来执行此操作？
解决方案
此链接包含以下解决方案。 Cocoa CF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 
  
 
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 = @"&lt;span&gt;Foo&lt;/span&gt;";
[string stringByUnescapingHTML];
Which returns
<span>Foo</span>
Hopefully unescaping all other HTML entities as well and even ASCII codes like Ӓ and the like.

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