我有一个RSS阅读器,它显示提要,然后单击自定义单元格时,将带您到本文。一切正常,但随后我对其进行了更改,以便可以与自定义单元一起使用。为此,我必须从情节提要中删除所有原型单元,然后再删除该单元和详细视图之间的序列。当我在应用程序中添加原型单元时,崩溃时没有任何错误。我很困扰。如何不使用原型单元或segue将其带入详细视图?我试过didSelectRowAtIndexPath,但这是一个UIViewController而不是UITableViewController。下面的表格视图代码让我知道您是否有任何想法。

#import "APPMasterViewController.h"

    #import "APPDetailViewController.h"
    #import "IITableViewCell.h"

    @interface APPMasterViewController () {
        NSXMLParser *parser;
        NSMutableArray *feeds;
        NSMutableDictionary *item;
        NSMutableString *title;
        NSMutableString *link;
        NSString *element;
    }
    @end

    @implementation APPMasterViewController

    - (void)awakeFromNib
    {
        [super awakeFromNib];
    }

    - (void)viewDidLoad {
        [super viewDidLoad];
        [[UINavigationBar appearance] setBarTintColor:[UIColor greenColor]];

        feeds = [[NSMutableArray alloc] init];
        NSURL *url = [NSURL URLWithString:@"http://example.com/?feed=rss"];
        parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
        [parser setDelegate:self];
        [parser setShouldResolveExternalEntities:NO];
        [parser parse];
    }

    - (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;
    }

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

        static NSString *simpleTableIdentifier = @"IITableViewCell";

        IITableViewCell *cell = (IITableViewCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

        if (cell == nil)
        {
            NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"IITableViewCell" owner:self options:nil];
            cell = [nib objectAtIndex:0];
        }

        cell.mainTextLabel.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];

        return cell;
    }

    - (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];

    }
    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    {

        return 78;
    }


    - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
        if ([[segue identifier] isEqualToString:@"showDetail"]) {

            NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
            NSString *string = [feeds[indexPath.row] objectForKey: @"link"];
            [[segue destinationViewController] setUrl:string];

        }
    }

    @end

最佳答案

使用UIViewController无关紧要,只需实现UITableViewDelegate协议即可启用:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;


您可以在UIViewController的viewDidLoad方法中设置委托

- (void)viewDidLoad {

  self.tableView.delegate = self;
  // UITableViewDataSource is another protocol you should implement
  self.tableView.dataSource = self;

}


您可以通过CTRL拖动到下一个视图控制器来设置segue。确保设置了segue的标识符,在本例中为“ MySegue”


接下来实现tableView:didSelectRowAtIndexPath:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];
    [self performSegueWithIdentifier:@"MySegue" sender:cell];
}


在这种方法中,您称为segue,可以将任何id作为发送者发送,在这种情况下,我们正在发送单元

然后,如果您想为segue做准备,请在任何UIViewController上实现以下方法

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.identifier isEqualToString:@"MySegue"]) {
        // prepare for segue here
    }
}

关于ios - 原型(prototype)单元不工作时如何使用segue,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/27872092/

10-12 07:41
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