objective-c 转换 & 到&在Objective-C中
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Converting & to & in Objective-C
提问by nbojja
I have a URL string in the following format.
我有以下格式的 URL 字符串。
http://myserver.com/_layouts/feed.aspx?xsl=4&web=%2F&page=dda3fd10-c776-4d69-8c55-2f1c74b343e2&wp=476f174a-82df-4611-a3df-e13255d97533
http://myserver.com/_layouts/feed.aspx?xsl=4&web=%2F&page=dda3fd10-c776-4d69-8c55-2f1c74b343e2&wp=476f174a-82df-4611-a3df-e13255d97533
I want to replace &with &in the above URL. My result should be:
我想，以取代&与&在上述网址。我的结果应该是：
http://myserver.com/_layouts/feed.aspx?xsl=4&web=%2F&page=dda3fd10-c776-4d69-8c55-2f1c74b343e2&wp=476f174a-82df-4611-a3df-e13255d97533
http://myserver.com/_layouts/feed.aspx?xsl=4&web=%2F&page=dda3fd10-c776-4d69-8c55-2f1c74b343e2&wp=476f174a-82df-4611-a3df-e13255d97533
Can someone post me the code to get this done?
有人可以向我发布代码来完成这项工作吗？
Thanks
谢谢
采纳答案by Chuck
[urlString stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
回答by Michael Waterfall
Check out my NSString category for HTML. Here are the methods available:
查看我的NSString 类别以获取 HTML。以下是可用的方法：
// Strips HTML tags & comments, removes extra whitespace and decodes HTML character entities.
- (NSString *)stringByConvertingHTMLToPlainText;
// Decode all HTML entities using GTM.
- (NSString *)stringByDecodingHTMLEntities;
// Encode all HTML entities using GTM.
- (NSString *)stringByEncodingHTMLEntities;
// Minimal unicode encoding will only cover characters from table
// A.2.2 of http://www.w3.org/TR/xhtml1/dtds.html#a_dtd_Special_characters
// which is what you want for a unicode encoded webpage.
- (NSString *)stringByEncodingHTMLEntities:(BOOL)isUnicode;
// Replace newlines with <br /> tags.
- (NSString *)stringWithNewLinesAsBRs;
// Remove newlines and white space from string.
- (NSString *)stringByRemovingNewLinesAndWhitespace;
回答by Louis Gerbarg
There is no built-in function for this in the iPhone SDK. You should file a bugthat you want the functionality. In the normal Mac OS X SDK you can either load the fragment into an NSAttributedStringas HTML and ask it to hand back a plain string, or use CFXMLCreateStringByUnescapingEntities().
iPhone SDK 中没有为此提供内置函数。您应该提交一个想要该功能的错误。在普通的 Mac OS X SDK 中，您可以将片段作为 HTML加载到NSAttributedString中并要求它返回一个纯字符串，或者使用CFXMLCreateStringByUnescapingEntities()。
@interface NSString (LGAdditions)
- (NSString *) stringByUnescapingEntities;
@end
@implementation NSString (LGAdditions)
- (NSString *) stringByUnescapingEntities {
CFStringRef retvalCF = CFXMLCreateStringByUnescapingEntities(kCFAllocatorDefault, (CFStringRef)self, NULL);
return [NSMakeCollectable(retvalCF) autorelease];
}
@end
回答by Richard Long
For iOS the following code should work for numeric codes. It should be relatively easy to extend to the likes of &...
对于 iOS，以下代码适用于数字代码。它应该相对容易扩展到&......
-(NSString*)unescapeHtmlCodes:(NSString*)input {
NSRange rangeOfHTMLEntity = [input rangeOfString:@"&#"];
if( NSNotFound == rangeOfHTMLEntity.location ) {
return input;
}
NSMutableString* answer = [[NSMutableString alloc] init];
[answer autorelease];
NSScanner* scanner = [NSScanner scannerWithString:input];
[scanner setCharactersToBeSkipped:nil]; // we want all white-space
while( ![scanner isAtEnd] ) {
NSString* fragment;
[scanner scanUpToString:@"&#" intoString:&fragment];
if( nil != fragment ) { // e.g. '& B'
[answer appendString:fragment];
}
if( ![scanner isAtEnd] ) { // implicitly we scanned to the next '&#'
int scanLocation = (int)[scanner scanLocation];
[scanner setScanLocation:scanLocation+2]; // skip over '&#'
int htmlCode;
if( [scanner scanInt:&htmlCode] ) {
char c = htmlCode;
[answer appendFormat:@"%c", c];
scanLocation = (int)[scanner scanLocation];
[scanner setScanLocation:scanLocation+1]; // skip over ';'
} else {
// err ?
}
}
}
return answer;
}
Some unit-test code ...
一些单元测试代码...
-(void)testUnescapeHtmlCodes {
NSString* expected = @"A & B";
NSString* actual = [self unescapeHtmlCodes:@"A & B"];
STAssertTrue( [expected isEqualToString:actual], @"actual = %@", actual );
expected = @"& B";
actual = [self unescapeHtmlCodes:@"& B"];
STAssertTrue( [expected isEqualToString:actual], @"actual = %@", actual );
expected = @"A &";
actual = [self unescapeHtmlCodes:@"A &"];
STAssertTrue( [expected isEqualToString:actual], @"actual = %@", actual );
}
