objective-c - 发送到实例的典型 UITableView 无法识别的选择器

Question

我有这个“tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance”错误，我几乎可以肯定是某种内存管理问题，但现在我已经厌倦了必须找到这个错误.只要您不向下滚动，TableView 就会很好地显示单元格，如果您向下滚动……应用程序崩溃。我使用的唯一属性称为“地方”，我已经检查过是否没有遗漏“ self ”。

所以..这是我的代码:

#import "PlacesViewController.h"
#import "FlickrFetcher.h"
#import "SinglePlaceViewController.h"

@implementation PlacesViewController

@synthesize places;

- (NSArray *)places
{
    if (!places) {
        NSSortDescriptor *content = [[NSSortDescriptor alloc] initWithKey:@"_content" ascending:YES];
        NSArray *unsortedPlaces = [FlickrFetcher topPlaces];    
        places = [unsortedPlaces sortedArrayUsingDescriptors:[NSArray arrayWithObjects: content, nil]];
    }
    return places;
}

#pragma mark -
#pragma mark Initialization

#pragma mark -
#pragma mark View lifecycle


- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"Top Places";
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}


// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return YES;
}


#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 1;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    return self.places.count;
}

- (NSDictionary *)placeAtIndexPath:(NSIndexPath *)indexPath
{
    return [self.places objectAtIndex:indexPath.row];
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"PlacesTableViewCell";
    NSLog(@"%@", [FlickrFetcher topPlaces]);
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }

    // Configure the cell...
    NSString *location = [[self placeAtIndexPath:indexPath] objectForKey:@"_content"];
    NSArray *splitLocation = [location componentsSeparatedByString:@", "];
    cell.textLabel.text = [splitLocation objectAtIndex:0];
    if (splitLocation.count == 2)
        cell.detailTextLabel.text = [splitLocation objectAtIndex:1];
    if (splitLocation.count == 3)
        cell.detailTextLabel.text = [[[splitLocation objectAtIndex:1] stringByAppendingString:@","] stringByAppendingString:[splitLocation objectAtIndex:2]];

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    return cell;
}


#pragma mark -
#pragma mark Table view delegate

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

    // Navigation logic may go here. Create and push another view controller.

    SinglePlaceViewController *spvc = [[SinglePlaceViewController alloc] init];
    // Pass the selected object to the new view controller.
    spvc.placeId = [[self placeAtIndexPath:indexPath] objectForKey:@"place_id"];
    [self.navigationController pushViewController:spvc animated:YES];
    [spvc release];

}


#pragma mark -
#pragma mark Memory management

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Relinquish ownership any cached data, images, etc. that aren't in use.
}

- (void)viewDidUnload {
    // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
    // For example: self.myOutlet = nil;
}


- (void)dealloc {
    [places release];
    [super dealloc];
}


@end

非常感谢您的帮助，我真的很抱歉让你们所有人为我做一些工作。

Answer 1

你没有提供太多关于错误的信息所以我只能猜测:

该错误表明获取消息 cellForRowAtIndexPath: 的对象实际上并未实现此方法。但是既然你确实实现了它，我能想到的唯一原因是你弄乱了 tableView 的“dataSource”属性并将其更改为你不应该更改的内容。

确保数据源是您的 PlacecViewController。