SAX解析
SAX:Simple API for XML。基於事件驅動的解析⽅方式,逐⾏行解析 數據。(採⽤用協議回調機制)
NSXMLParser類
NSXMLParser是iOS⾃自帶的XML解析類。採⽤用SAX⽅方式解析數據。
解析過程由NSXMLParserDelegate協議⽅方法回調
解析過程:開始標籤->取值->結束標籤->取值
<?xml version = "1.0" encoding = "UTF-8"?>
<students>
<student>
<name>yadong</name>
<sex>man</sex>
<phone>18310057255</phone>
</student>
<student>
<name>kelin</name>
<sex>man</sex>
<phone>18410057255</phone>
</student>
<student>
<name>marry</name>
<sex>woman</sex>
<phone>18510057255</phone>
</student>
</students>
#import "ViewController.h"
#import "StudentModal.h"
@interface ViewController () <NSXMLParserDelegate>
{
// 用來記錄當前正在操作的標籤
NSString *_currentElement;
}
@property (nonatomic, strong) NSMutableArray *xmlSAXArray;
@end
- (IBAction)XMLSAXBtttonDidClicked:(UIButton *)sender {
// 1、拿到 xml 文件的路徑
NSString *path = [[NSBundle mainBundle] pathForResource:@"myData" ofType:@"xml"];
// 2、根據文件路徑獲取文件的內容
NSData *data = [[NSData alloc] initWithContentsOfFile:path];
// 3、根據 data 初始化一個 NSXMLParser 對象
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
// 4、設置 NSXMLParser 對象的相關屬性
// 是否處理命名空間
[parser setShouldProcessNamespaces:NO];
// 是否設置報告處理(前綴)
[parser setShouldReportNamespacePrefixes:NO];
// 5、設置代理
parser.delegate = self;
// 6、開始解析(調用)
[parser parse];
}
實現 NSXMLParser 代理方法
開始解析(打開文檔)
- (void)parserDidStartDocument:(NSXMLParser *)parser
{
// 初始化數組
self.xmlSAXArray = [NSMutableArray array];
NSLog(@"打開文檔");
}
打開標籤
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:@"student"]) {
StudentModal *modal = [[StudentModal alloc] init];
[self.xmlSAXArray addObject:modal];
}
_currentElement = elementName;
NSLog(@"打開標籤%@",elementName);
}
取值
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
StudentModal *modal = [self.xmlSAXArray lastObject];
if ([_currentElement isEqualToString:@"name"]) {
modal.name = string;
} else if ([_currentElement isEqualToString:@"sex"]) {
modal.sex = string;
} else if ([_currentElement isEqualToString:@"phone"]) {
modal.phoneNumber = string;
}
NSLog(@"取值%@", string);
}
關閉標籤
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
_currentElement = nil;
NSLog(@"關閉標籤%@",elementName);
}
關閉文檔
- (void)parserDidEndDocument:(NSXMLParser *)parser
{
// 打印驗證
for (StudentModal *stu in self.xmlSAXArray) {
NSLog(@"%@,%@,%@", stu.name, stu.sex, stu.phoneNumber);
}
NSLog(@"關閉文檔");
}