iOS - XML pretty-print

Question

我在我的 iOS 应用程序中使用 GDataXML，并且想要一种简单的方法来格式化和打印 XML 字符串 - “ pretty-print ”

有人知道 Objective C 中的算法，或者可以用我可以翻译的另一种语言运行的算法吗？

Answer 1

可以直接修改GDataXMLNode的源码:

- (NSString *)XMLString {
   ...
   // enable formatting (pretty print / beautifier)
   int format = 1; // changed from 0 to 1
   ...
}

备选方案:

因为我不想直接修改库(出于维护原因)，所以我写了那个类来从外部扩展类:

GDataXMLNode+PrettyFormatter.h:

#import "GDataXMLNode.h"
@interface GDataXMLNode (PrettyFormatter)

- (NSString *)XMLStringFormatted;

@end

GDataXMLNode+PrettyFormatter.m:

#import "GDataXMLNode+PrettyFormatter.h"

@implementation GDataXMLNode (PrettyFormatter)

- (NSString *)XMLStringFormatted {

    NSString *str = nil;

    if (xmlNode_ != NULL) {

        xmlBufferPtr buff = xmlBufferCreate();
        if (buff) {

            xmlDocPtr doc = NULL;
            int level = 0;
            // enable formatting (pretty print / beautifier)
            int format = 1;

            int result = xmlNodeDump(buff, doc, xmlNode_, level, format);

            if (result > -1) {
                str = [[[NSString alloc] initWithBytes:(xmlBufferContent(buff))
                                                length:(xmlBufferLength(buff))
                                              encoding:NSUTF8StringEncoding] autorelease];
            }
            xmlBufferFree(buff);
        }
    }

    // remove leading and trailing whitespace
    NSCharacterSet *ws = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    NSString *trimmed = [str stringByTrimmingCharactersInSet:ws];
    return trimmed;
}

@end