- 先从网络获取XML文件
NSURL *url = [NSURL URLWithString:@"https://127.0.0.1/videos.xml"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:
^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
if (connectionError) {
NSLog(@"连接错误 %@", connectionError);
return;
}
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
if (httpResponse.statusCode == 200 || httpResponse.statusCode == 304) {
// 解析数据
} else {
NSLog(@"服务器内部错误");
}
}];
- 在注释为解析数据处开始解析网络获取的数据
// 给ViewController添加代理
@interface ViewController () <NSXMLParserDelegate>
@end
// 解析数据
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
// 设置代理
parser.delegate = self;
// 开始执行代理方法
[parser parse];
- 实现代理方法
// 1. 开始解析文档
- (void)parserDidStartDocument:(NSXMLParser *)parser {
NSLog(@"1开始解析");
}
// 2. 找开始节点
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict {
NSLog(@"2找开始节点 %@--%@", elementName, attributeDict);
}
// 3. 找节点之间的内容
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
NSLog(@"3找节点之间的内容 %@", string);
}
// 4. 找结束节点
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
NSLog(@"4找结束节点 %@", elementName);
}
// 5. 结束解析文档
- (void)parserDidEndDocument:(NSXMLParser *)parser {
NSLog(@"5结束解析");
}
// 6. 解析出错
- (void) parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
NSLog(@"解析出错");
}
- 构建实体类
Video.h
#import <Foundation/Foundation.h>
@interface Video : NSObject
@property (nonatomic, strong) NSNumber *videoId;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSNumber *length;
@property (nonatomic, copy) NSString *videoURL;
@property (nonatomic, copy) NSString *imageURL;
@property (nonatomic, copy) NSString *desc;
@property (nonatomic, copy) NSString *teacher;
@property (nonatomic, readonly) NSString *time;
- (instancetype)initWithDict:(NSDictionary *)dict;
+ (instancetype)videoWithDict:(NSDictionary *)dict;
@end
video.m
#import "Video.h"
@implementation Video
- (instancetype)initWithDict:(NSDictionary *)dict {
if (self = [super init]) {
[self setValuesForKeysWithDictionary:dict];
}
return self;
}
+ (instancetype)videoWithDict:(NSDictionary *)dict {
return [[self alloc] initWithDict:dict];
}
- (NSString *)time {
int len = self.length.intValue;
return [NSString stringWithFormat:@"%02d:%02d:%02d:", len / 3600, (len %3600) / 60, (len % 60) ];
}
- (NSString *)description {
return [NSString stringWithFormat:@"<%@ : %p> { videoId : %@, name : %@, length : %@, videoURL : %@, imageURL : %@, desc : %@, teacher : %@}", [self class], self, self.videoId, self.name, self.length, self.videoURL, self.imageURL, self.desc, self.teacher];
}
@end
- XML解析成对象
@interface ViewController () <NSXMLParserDelegate>
// 保存XML数据
@property (nonatomic, strong) NSMutableArray *videos;
// 当前创建的video对象
@property (nonatomic, strong) Video *video;
// 保存当前节点内容
@property (nonatomic, copy) NSMutableString *string;
@end
@implementation ViewController
// 懒加载
- (NSMutableArray *)videos {
if (_videos == nil) {
_videos = [NSMutableArray arrayWithCapacity:10];
}
return _videos;
}
- (NSMutableString *)string {
if (_string == nil) {
_string = [NSMutableString string];
}
return _string;
}
@end
- 在video节点时创建Video对象
// 2. 找开始节点
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict {
NSLog(@"2找开始节点 %@--%@", elementName, attributeDict);
// 如果是video标签，创建video对象
if ([elementName isEqualToString:@"video"]) {
self.video = [[Video alloc] init];
self.video.videoId = @([attributeDict[@"videoId"] intValue]);
// 添加到数组中
[self.videos addObject:self.video];
}
}
- 拼接保存每个节点中的内容
// 3. 找节点之间的内容
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
NSLog(@"3找节点之间的内容 %@", string);
[self.string appendString:string];
}
- 将内容与对应的节点赋值，并将string对象置空
// 4. 找结束节点
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
NSLog(@"4找结束节点 %@", elementName);
// 判断标签是否有对应的属性
if (![elementName isEqualToString:@"video"] && ![elementName isEqualToString:@"videos"]) {
// 为节点赋值
[self.video setValue:self.string forKey:elementName];
}
// 清空字符串
[self.string setString:@""];
}
-
打印查看结果
结果.png
videos.xml内容
<videos>
<video videoId="1">
<name>01.C语言-语法预览</name>
<length>320</length>
<videoURL>/itcast/videos/01.C语言-语法预览.mp4</videoURL>
<imageURL>/itcast/images/head1.png</imageURL>
<desc>C语言-语法预览</desc>
<teacher>李雷</teacher>
</video>
<video videoId="2">
<name>02.C语言-第一个C程序</name>
<length>2708</length>
<videoURL>/itcast/videos/02.C语言-第一个C程序.mp4</videoURL>
<imageURL>/itcast/images/head2.png</imageURL>
<desc>C语言-第一个C程序</desc>
<teacher>李雷</teacher>
</video>
<video videoId="3">
<name>03.C语言-函数</name>
<length>822</length>
<videoURL>/itcast/videos/03.C语言-函数.mp4</videoURL>
<imageURL>/itcast/images/head3.png</imageURL>
<desc>C语言-函数</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="4">
<name>04.C语言-基本数据类型</name>
<length>1113</length>
<videoURL>/itcast/videos/04.C语言-基本数据类型.mp4</videoURL>
<imageURL>/itcast/images/head4.png</imageURL>
<desc>C语言-基本数据类型</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="5">
<name>05.C语言-基本运算</name>
<length>594</length>
<videoURL>/itcast/videos/05.C语言-基本运算.mp4</videoURL>
<imageURL>/itcast/images/head5.png</imageURL>
<desc>C语言-基本运算</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="6">
<name>06.C语言-数组</name>
<length>923</length>
<videoURL>/itcast/videos/06.C语言-数组.mp4</videoURL>
<imageURL>/itcast/images/head6.png</imageURL>
<desc>C语言-数组</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="7">
<name>07.C语言-字符串</name>
<length>848</length>
<videoURL>/itcast/videos/07.C语言-字符串.mp4</videoURL>
<imageURL>/itcast/images/head7.png</imageURL>
<desc>C语言-字符串</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="8">
<name>08.C语言-指针</name>
<length>502</length>
<videoURL>/itcast/videos/08.C语言-指针.mp4</videoURL>
<imageURL>/itcast/images/head8.png</imageURL>
<desc>C语言-指针</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="9">
<name>09.C语言-指针用例</name>
<length>558</length>
<videoURL>/itcast/videos/09.C语言-指针用例.mp4</videoURL>
<imageURL>/itcast/images/head1.png</imageURL>
<desc>C语言-指针用例</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="10">
<name>10.C语言-指针与数组</name>
<length>1682</length>
<videoURL>/itcast/videos/10.C语言-指针与数组.mp4</videoURL>
<imageURL>/itcast/images/head2.png</imageURL>
<desc>C语言-指针与数组</desc>
<teacher>韩梅梅</teacher>
</video>
<video videoId="11">
<name>11.C语言-指针与字符串</name>
<length>1092</length>
<videoURL>/itcast/videos/11.C语言-指针与字符串.mp4</videoURL>
<imageURL>/itcast/images/head3.png</imageURL>
<desc>C语言-指针与字符串</desc>
<teacher>韩梅梅</teacher>
</video>
</videos>
