问题描述
在我的应用程序中，我正在启动NSURLConnection，解析XML，从此XML初始化数组，并在tableView中显示它。在ViewDidLoad中，我呼吁服务器使用查询参数0，并且它返回给我字符串，在所有转换后有一个tableView 4行 - 标题，当我推送一些这些标题时，所有进程（连接到服务器，解析，数组初始化，）必须重复。在didSelectedRowAtIndexPath中，我必须传输节ID（以便服务器向我发送正确的数据）。我怎么能正确地做到这一点？我在ViewDidLoad中建立连接，我怎么能再次调用它？
In my app I'm starting NSURLConnection, parsing XML, initialize array from this XML, and show it in the tableView. In ViewDidLoad I appeal to the server with a query parameter 0 , and it's returned for me string, after all conversion a have in tableView 4 rows - titles, and when i push on some of this titles, all process (connection to the server, parsing, arrays initialising, ) must be repeated. In didSelectedRowAtIndexPath I have to transmit section ID (so that the server sent me the correct data). How can I do it correctly? I'm establish connection in ViewDidLoad, how can I call it again?
我的.m文件：
#import "catalogViewController.h"
#import "XMLReader.h"
@interface catalogViewController ()
@end
@implementation catalogViewController
- (id)initWithStyle:(UITableViewStyle)style {
self = [super initWithStyle:style];
if (self) { } return self;
}
//-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-CONNECTIONS METHOD START-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-=-
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[_receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[_receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[connection release];
[_receivedData release];
NSString *errorString = [[NSString alloc] initWithFormat:@"Connection failed! Error - %@ %@ %@", [error localizedDescription], [error description], [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]]; NSLog(@"%@",errorString);
[errorString release];
}
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-GET FULL DATA HERE-=-=-=-=-=-=-=-=--=-=-=-=-=-=-
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *dataString = [[NSString alloc] initWithData:_receivedData encoding:NSUTF8StringEncoding];
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-XMLPARSER PART START-=-=-=-=-=-=-=-=-=-=-=-=-=-=- //
NSString *testXMLString = [NSString stringWithContentsOfURL:myURL usedEncoding:nil error:nil];
// -=-=-=-=-=-=-=-=-=-=Parse the XML into a dictionary-=-=-=-=-=-=-=-=-=-=
NSError *parseError = nil;
_xmlDictionary = [XMLReader dictionaryForXMLString:testXMLString error:&parseError];
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-XMLPARSER PART END-=-=-=-=-=-=-=
_titleArr = [[NSArray alloc] initWithArray:[[[_xmlDictionary objectForKey:@"result"] objectForKey:@"name"] valueForKey:@"text"]];
_IDArr = [[NSArray alloc] [[[_xmlDictionary objectForKey:@"result"] objectForKey:@"id"] valueForKey:@"text"]];
_priceArr= [[NSArray alloc][[[_xmlDictionary objectForKey:@"result"] objectForKey:@"price"] valueForKey:@"text"]];
_ImageURLArr=[[NSArray alloc][[[_xmlDictionary objectForKey:@"result"] objectForKey:@"img"] valueForKey:@"text"]];
[connection release];
[_receivedData release];
[dataString release];
_didDataLoaded=TRUE;
[_myTableView reloadData]; // IBOutlet property
[self.tableView reloadData]; //default
}
//-=-=-=-=-=-=-=-=-=-=-Connection methods END-=-=-=-=-=-=-=-=-=-
- (void)viewDidLoad {
[super viewDidLoad];
_didDataLoaded=FALSE;
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-XMLPARSER PART START-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//-=-==-=-=-=-=-=-=-=-=-=-=--=-=START Shit with connection-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
NSString* params = @"request_params";
NSURL* url = [NSURL URLWithString:@"my URL"];
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];
[request addValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
request.HTTPMethod = @"POST";
request.HTTPBody = [params dataUsingEncoding:NSUTF8StringEncoding];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (connection) {
NSLog(@"Connecting...");
_receivedData = [[NSMutableData data] retain];
} else {
NSLog(@"Connecting error");
}
}
//-=-==-=-=--=-==-=-=-=-=-=--=-==---=-=--==-=-=-=-=-TableView methods-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=--=-=-=-=-=-=-=
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (_didDataLoaded == FALSE) {
return 1;
}
else return self.titleArr.count;
}
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView { return 1; }
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"creatures"];
UIImage *creatureImage = nil;
if (_didDataLoaded == FALSE) {
cell.textLabel.text=@"Downloading...";
cell.detailTextLabel.text= @"downloading...";
} else {
cell.textLabel.text = [self.titleArr objectAtIndex:indexPath.row];
cell.detailTextLabel.text= _IDArr[indexPath.row];
NSString *img = self.ImageURLArr[indexPath.row];
creatureImage =[[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:img]]]; cell.imageView.image = creatureImage;
}
return cell;
}
@end
推荐答案
您可以将相关代码从viewDidLoad移动到特定方法，例如：
You can move the relevant code from viewDidLoad to a specific method, something like:
- (void)loadXMLData {
// Initiate your loading/parsing
}
在viewDidLoad中只需调用此方法：
In viewDidLoad just call this method:
- (void)viewDidLoad {
[super viewDidLoad];
[self loadXMLData];
}
这样你可以多次调用[self loadXMLData]。
This way you can call [self loadXMLData] multiple times.
但是......小心从UITableViewDelegate方法实现中调用[tableView reloadData]，因为这将导致tableview调用（至少某些）委托方法，这可以导致递归循环或其他奇怪的行为。
However... be careful with calling [tableView reloadData] from inside a UITableViewDelegate method implementation, as this will cause the tableview to call (at least some of the) delegate methods, which can cause recursive loops or other odd behaviour.
这篇关于如何使用didSelectedRowAtIndexPath在tableView中重新加载数据并调用其中的方法组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！