【发布时间】：2015-04-08 08:07:49
【问题描述】：
我是新手，正在尝试使用 rss 提要开发一个简单的新闻阅读器应用程序。现在我被搜索栏困住了。问题是它会在 tableview 中加载所有数据，但是当我从搜索栏中搜索时，它不会填充 searchResults。
我正在尝试从标题中过滤搜索结果 这是代码。
#import "APPMasterViewController.h"
#import "APPDetailViewController.h"
@interface APPMasterViewController () {
NSXMLParser *parser;
NSMutableArray *feeds;
NSMutableDictionary *item;
NSMutableString *title;
NSMutableString *link;
NSString *element;
}
@property (strong,nonatomic ) NSArray *searchResults;
@end
@implementation APPMasterViewController
@synthesize mynewsFeed;
- (void)awakeFromNib
{
[super awakeFromNib];
}
- (void)viewDidLoad {
[ super viewDidLoad];
feeds = [[NSMutableArray alloc] init];
NSURL *url = [NSURL URLWithString:mynewsFeed];
parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
[parser setDelegate:self];
[parser setShouldResolveExternalEntities:NO];
[parser parse];
self.searchResults = [[NSArray alloc] init];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section
{
// return feeds.count;
if(tableView == self.searchDisplayController.searchResultsTableView)
{
return [self.searchResults count];
}
else
{
return feeds.count;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
if( tableView == self.searchDisplayController.searchResultsTableView)
{
cell.textLabel.text = [[self.searchResults objectAtIndex:indexPath.row] objectForKey: @"title"];
}
else
{
cell.textLabel.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];
}
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if([[self searchDisplayController] isActive])
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
[self performSegueWithIdentifier:@"showDetail" sender:cell ];
}
}
#pragma for searching
-(void)FilterContentForSearchText:(NSString *)searchText scope:(NSString *)scope
{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains[c] %@",searchText];
self.searchResults = [feeds filteredArrayUsingPredicate:predicate];
NSLog(@"All my array list: %@", self.searchResults);
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self FilterContentForSearchText:searchString scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
return YES;
}
#pragma parser methods
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {
element = elementName;
if ([element isEqualToString:@"item"]) {
item = [[NSMutableDictionary alloc] init];
title = [[NSMutableString alloc] init];
link = [[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:@"item"]) {
[item setObject:title forKey:@"title"];
[item setObject:link forKey:@"link"];
[feeds addObject:[item copy]];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
if ([element isEqualToString:@"title"]) {
[title appendString:string];
} else if ([element isEqualToString:@"link"]) {
[link appendString:string];
}
}
- (void)parserDidEndDocument:(NSXMLParser *)parser {
[self.tableView reloadData];
}
#pragma for Segue
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
UITableViewCell *cell = (UITableViewCell *)sender;
if ([[self searchDisplayController] isActive])
{
NSIndexPath *indexPath = [[[self searchDisplayController] searchResultsTableView] indexPathForCell:cell];
feeds = [[self searchResults] objectAtIndex:[indexPath row]];
NSString *string = [feeds[indexPath.row] objectForKey: @"link"];
[[segue destinationViewController] setUrl:string];
}
if ([[segue identifier] isEqualToString:@"showDetail"])
{
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSString *string = [feeds[indexPath.row] objectForKey: @"link"];
[[segue destinationViewController] setUrl:string];
}
}
@end
NSLOG:::===
015-04-08 13:20:45.742 RSSreader[1117:914955] table content: (
{
link = "http://indiatoday.feedsportal.com/c/33614/f/589699/s/45338e70/sc/28/l/0Lindiatoday0Bintoday0Bin0Cstory0Capple0Eindia0Eearns0E0U10Ebillion0Ein0Erevenues0C10C4290A490Bhtml/story01.htm";
title = "Apple India earns $1 billion in revenues";
},
{
link = "http://indiatoday.feedsportal.com/c/33614/f/589699/s/45338e6d/sc/7/l/0Lindiatoday0Bintoday0Bin0Cstory0Cpadma0Evibhushan0Econferred0Eon0Eamitabh0Ebachchan0C10C4290A470Bhtml/story01.htm";
title = "Big B receives Padma Vibhushan, Abhishek and Aishwarya attend ceremony";
},
{
link = "http://indiatoday.feedsportal.com/c/33614/f/589699/s/45338e74/sc/15/l/0Lindiatoday0Bintoday0Bin0Cstory0C40A0A0A0Eusers0Eto0Etry0Eout0Ethe0Elg0Eg40Eprior0Eto0Ethe0Elaunch0C10C4290A40A0Bhtml/story01.htm";
title = "4000 users to try out the LG G4 prior to the launch";
};]
2015-04-08 13:20:49.026 RSSreader[1117:914955] All my array list: (
)
【问题讨论】：