NSXMLParser简单示例
答
作为探索NSXMLParser的一部分,我创建了以下非常简单的代码。
的main.m
int main(int argc, const char * argv[])
{
@autoreleasepool {
NSLog(@"Main Started");
NSError *error = nil;
// Load the file and check the result
NSData *data = [NSData dataWithContentsOfFile:@"/Users/Tim/Documents/MusicXml/Small.xml"
options:NSDataReadingUncached
error:&error];
if(error) {
NSLog(@"Error %@", error);
return 1;
}
// Create a parser and point it at the NSData object containing the file we just loaded
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
// Create an instance of our parser delegate and assign it to the parser
MyXmlParserDelegate *parserDelegate = [[MyXmlParserDelegate alloc] init];
[parser setDelegate:parserDelegate];
// Invoke the parser and check the result
[parser parse];
error = [parser parserError];
if(error)
{
NSLog(@"Error %@", error);
return 1;
}
// All done
NSLog(@"Main Ended");
}
return 0;
}
MyXmlParserDelegate.h
#import <Foundation/Foundation.h>
@interface MyXmlParserDelegate : NSObject <NSXMLParserDelegate>
@end
MyXmlParserDelegate.m
#import "MyXmlParserDelegate.h"
@implementation MyXmlParserDelegate
- (void) parserDidStartDocument:(NSXMLParser *)parser {
NSLog(@"parserDidStartDocument");
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {
NSLog(@"didStartElement --> %@", elementName);
}
-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
NSLog(@"foundCharacters --> %@", string);
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
NSLog(@"didEndElement --> %@", elementName);
}
- (void) parserDidEndDocument:(NSXMLParser *)parser {
NSLog(@"parserDidEndDocument");
}
@end
我,希望它可以帮助别人的贴吧。
+0
感谢您的出发点。很有帮助。 –
答
以下是以下原始Objective-C代码的Swift版本。
它是使用XCode 7.3构建和测试的。在写代理时,我发现从文档中复制函数原型非常方便。值得注意的是,Swift目前是一个相当迅速移动的目标。
main.swift
import Foundation
// Let's go
print("Main: Started")
// Try to load the file. Display the description of the error if one occurs
var xmlData : NSData
do {
xmlData = try NSData(contentsOfFile: "/Users/amt/Documents/TestXml/Test.xml",
options: .DataReadingMappedIfSafe)
}
catch let error as NSError {
print("Main: \(error.description)")
exit(1)
}
// Create a parser and point it at the NSData object containing
// the file we just loaded
var parser : NSXMLParser! = NSXMLParser(data: xmlData)
// Create a parser delegate object and assign it to the parser
// Beware the "weak" reference and don't try to combine the two lines
// of code into one unless you like EXC_BAD_ACCESS exceptions
var parserDelegate : MyXmlParserDelegate = MyXmlParserDelegate()
parser.delegate = parserDelegate
// This example also illustrates some of the namespace functions defined in
// the delegate protocol so enable namespace reporting to see them invoked
parser.shouldReportNamespacePrefixes = true
// Parse the document
if !parser.parse() {
// If parse() returned false then an error occurred so display is location
// and details
let error = parser.parserError
let line = parser.lineNumber
let col = parser.columnNumber
print("Parsing failed at \(line):\(col): \(error?.localizedDescription)")
}
// All done
print("Main: Ended")
exit(0)
MyXmlParserDelegate.swift
import Foundation
class MyXmlParserDelegate:NSObject, NSXMLParserDelegate {
@objc func parserDidStartDocument(parser: NSXMLParser) {
print("parserDidStartDocument")
}
@objc func parser(parser: NSXMLParser, didStartElement elementName: String,
namespaceURI: String?, qualifiedName qName: String?,
attributes attributeDict: [String : String]) {
print("didStartElement --> \(elementName)")
}
@objc func parser(parser: NSXMLParser, foundCharacters string: String) {
print("foundCharacters --> \(string)")
}
@objc func parser(parser: NSXMLParser, didEndElement elementName: String,
namespaceURI: String?, qualifiedName qName: String?) {
print("didEndElement --> \(elementName)")
}
@objc func parser(parser: NSXMLParser, didStartMappingPrefix prefix: String,
toURI namespaceURI: String) {
print("didStartMappingPrefix --> Prefix: \(prefix) toURI: \(namespaceURI)")
}
@objc func parser(parser: NSXMLParser, didEndMappingPrefix prefix: String) {
print("didEndMappingPrefix --> Prefix: \(prefix)")
}
@objc func parserDidEndDocument(parser: NSXMLParser) {
print("parserDidEndDocument")
}
}
答
夫特4实施例 - 解析XIB-文件。
import Foundation
class XMLTransformer: NSObject {
private let parser: XMLParser
private var stack = [Node]()
private var tree: Node?
init(data: Data) {
parser = XMLParser(data: data)
super.init()
parser.delegate = self
}
}
extension XMLTransformer {
func transform() throws -> Node? {
parser.parse()
if let e = parser.parserError {
throw e
}
assert(stack.isEmpty)
assert(tree != nil)
return tree
}
}
extension XMLTransformer: XMLParserDelegate {
func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
guard let tag = Tag(rawValue: elementName) else {
return
}
let node = Node(tag: tag, attributes: attributeDict, nodes: [])
stack.append(node)
}
func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
guard let tag = Tag(rawValue: elementName) else {
return
}
let lastElement = stack.removeLast()
assert(lastElement.tag == tag)
if let last = stack.last {
last.nodes += [lastElement]
} else {
tree = lastElement
}
}
}
extension XMLTransformer {
enum Tag: String {
case document
case objects
case tableViewCell, tableViewCellContentView
case subviews
case mapView
case constraints, constraint
case connections, outlet
}
}
extension XMLTransformer {
class Node {
let tag: Tag
let attributes: [String : String]
var nodes: [Node]
init(tag: Tag, attributes: [String : String], nodes: [Node] = []) {
self.tag = tag
self.attributes = attributes
self.nodes = nodes
}
}
}
用法:
let data = try xib(named: "MapTableViewCell")
let c = XMLTransformer(data: data)
let tree = try c.transform() // Here you have parsed XML in a Tree representation.
Stack Overflow是,从根本上绝对,一个问题/答案的网站。你可以回答你自己的问题,但你仍然应该遵循这个网站的形式。你的帖子很有用(谢谢!),但它不符合Stack Overflow的意图。请不要太防守,并根据SO实践重构您的帖子。 – bkbeachlabs
注意到下次将坚持更多的Q&A风格。至于GitHub,我不知道如何使用它。 – TJA
您能否将解答复制到下面的答案中,以便我们可以将它解决并从未答复的列表中解决?谢谢。 –