我有一个以下格式的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
我想在上面的网址中将 &
替换为 &
。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
有人可以发给我代码来完成这项工作吗?
由于
答案 0 :(得分:114)
查看我的NSString category for 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;
答案 1 :(得分:14)
[urlString stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
答案 2 :(得分:8)
iPhone SDK中没有内置功能。你应该file a bug想要这个功能。在普通的Mac OS X SDK中,您可以将片段加载到NSAttributedString作为HTML并要求它回传纯字符串,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
答案 3 :(得分:4)
对于iOS,以下代码应适用于数字代码。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;
}
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 );
}