如何从另一个类调用已解析(NSXMLParser)xml 的内容?代码审查? [英] How to call content of a parsed (NSXMLParser) xml from another class? Code review?

问题描述

我正在尝试在视图控制器中提供已解析的 xml 文件的内容.当节点字符串的内容为.

I am trying to give the contents of a parsed xml file in the view Controller. How can i do it when the content of the node string is.

xml 文件是这样的:

xml file is like this:

<XML>
 <Data> 
    <ID_Number>8</ID_Number>
    <Date> 13.12.2009</Date>
    <Time>  17:50:00</Time>
    <Temperature> 37.2  </Temperature>
    <Speed>34.2</Speed>
    <Direction>90.4</Direction>
    <AirPressure>1040.3</AirPressure>
 </Data>
</XML>

.h 文件中的我的解析器

My Parser in .h file

@interface Parser : NSObject 


@property ( nonatomic,strong) NSMutableString *mutableTemperatureValue;
@property ( nonatomic,strong) NSMutableString *mutableWindDirection;
@property ( nonatomic,strong) NSMutableString *mutableWindSpeed;
@property (nonatomic,strong) NSMutableString *mutableAirPressure;
@property (nonatomic,strong) NSMutableString *mutableAcquiredDate;
@property (nonatomic,strong) NSMutableString *mutableAcquiredTime;

-(void)parserStart;
@end

文件:

-(void)parserStart
{
NSURL *url = [NSURL URLWithString:myWebServiceXMLUrl];
NSData *data = [NSData dataWithContentsOfURL:url];

NSXMLParser *xmlParser = [[NSXMLParser alloc]initWithData:data ];

NSString *xmlCheck = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"xmlCheck =%@", xmlCheck);

[xmlParser setDelegate:self];

[xmlParser parse];

}

.m 文件中的委托方法，例如:didStart...

Delegate methods in .m file like: didStart...

if([elementName isEqualToString:@"Date"] ){
    self.mutableAcquiredDate = [[NSMutableString alloc]init];
    return;
}

if([elementName isEqualToString:@"Time"]){
    self.mutableAcquiredTime = [[NSMutableString alloc]init]; 
    return;
}

if([elementName isEqualToString:@"Temperature"]){
    self.mutableTemperatureValue = [[NSMutableString alloc]init];
    return;
}
.
.
.

找到的字符:

[self.mutableTemperatureValue appendString:string];
[self.mutableWindSpeed appendString:string];
[self.mutableWindDirection appendString:string];
[self.mutableAirPressure appendString:string];
[self.mutableAcquiredDate appendString:string];
[self.mutableAcquiredTime appendString:string];

并没有结束...

 if([elementName isEqualToString:@"Date"]){
    NSLog(@"mutableAcquiredDate : %@", self.mutableAcquiredDate); // this gives the right data
    return;

}

在 viewController .h 文件中

in viewController .h file

@property (strong, nonatomic) IBOutlet UILabel *labelWindSpeed;
@property (strong, nonatomic) IBOutlet UILabel *labelTemperatur;
@property (strong, nonatomic) IBOutlet UILabel *labelAirPressure;
@property (strong, nonatomic) IBOutlet UILabel *labelUpdateDateTime;

在 viewController .m 文件中

in viewController .m file

 //  Create Parser object and start parsing 
self.parser = [[Parser alloc]init];
[self.parser parserStart];

// Assigning the values from Parser Class to labels

// Date and Time
self.labelUpdateDateTime.text = self.parser.mutableAcquiredDate ;
NSLog(@"---------:%@", self.labelUpdateDateTime.text);// This gives all the contents of the xml nodes why?

 // Temperatur
myStartTemperatureValue = [self.parser.mutableTemperatureValue floatValue];
labelTemperatur.text = [NSString stringWithFormat:@"%.1f", myStartTemperatureValue];// This     works also correct.

如何在不列出节点的所有内容的情况下仅从 viewController 访问 Date 节点的内容.谢谢...

How can I reach only the content of the Date node from viewController without having all the contents of the nodes listed. Thanks...

推荐答案

我找到了将它们放入 NSMutableDictionary 的最简单方法，因为您可以通过它们的原始标签访问它们.在解析器的标头中，声明

I found the easiest way to put them in an NSMutableDictionary since you could access them by their original tags. In your header for the parser, declare

@property (strong, nonatomic) NSMutableDictionary *dic;
BOOL parsing;
NSString *title;
NSString *cont;

并像这样使用委托

@synthesize dic;
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict{
parsing = YES;
title = elementName;
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
if (parsing) {
NSMutableString *str1 = [[NSMutableString alloc] initWithCapacity:1000];
[str1 appendString:string];
if ([dic valueForKey:title] == nil) {
    [dic setValue:str1 forKey:title];
}
else{
    NSMutableArray *arr = [[NSMutableArray alloc] init];
    NSMutableArray *delete = [[NSMutableArray alloc] init];
    if ([[dic objectForKey:title] isKindOfClass:[NSMutableArray class]]){
        for (NSString *str in [dic objectForKey:title]){
            [arr addObject:str];
        }
        [arr addObject:str1];
        for (NSString *s in arr) {
            if ([s isEqualToString:@"\n"]) {
                [delete addObject:s];
            }
        }
        [arr removeObjectsInArray:delete];
        [dic setObject:arr forKey:title];
    }
    else{
        [arr addObject:[dic objectForKey:title]];
        [arr addObject:str1];
        for (NSString *s in arr) {
            if ([s isEqualToString:@"\n"]) {
                [delete addObject:s];
            }
        }
        [arr removeObjectsInArray:delete];
        [dic setObject:arr forKey:title];
    }
}
}
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
if (parsing) {
parsing = NO;
}
}

这将根据它们在 XML 中的标签将它们全部插入 NSMutableDictionary *dic，并通过从不同的类调用它来访问某些对象，例如日期

This inserts them all into the NSMutableDictionary *dic according to their tags in the XML, and access certain objects, like the date, by calling this from a different class

[parser.dic objectForKey:@"Date"];

这也会为具有多个同名节点的文件创建一个数组

This also creates an array for a file that has multiple nodes with the same name

这篇关于如何从另一个类调用已解析(NSXMLParser)xml 的内容?代码审查?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！