Question

我再次陷入困境。。

我有一个带有一些自定义NSTableCellView的NSTableView，其中一个包含几个NSTextField。

现在，我想修改某些字段中显示的值，因此创建了覆盖创建单元格函数，如下所示：

- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {

    // Get a new ViewCell
    NSTableCellView *cellView = [tableView makeViewWithIdentifier:tableColumn.identifier owner:self];

然后我使用以下代码来定位特定列：

if ([tableColumn.identifier isEqualToString:@"Tweets"]){
         NSFetchRequest *request = [[NSFetchRequest alloc] init];
        //Set predicate and filter for New tweets page
        if ([self.currentTwitterView isEqualToString:@"new"]) {
        NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == NO) AND (tweetDeleted == NO)  AND (scheduledTweet == NO)"];
        NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"postDate" ascending:NO];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
        [request setPredicate:testForTrue];
        [request setSortDescriptors:sortDescriptors];

        //Set filter and predicate for the Approved tweets page
    } else if ([self.currentTwitterView isEqualToString:@"approved"]){
        NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"(approved == YES) AND (tweetDeleted == NO)  AND (scheduledTweet == NO)"];
        NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"approvedDate" ascending:NO];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
        [request setPredicate:testForTrue];
        [request setSortDescriptors:sortDescriptors];

        //Set filter and preicate for the Deleted tweets page
    } else if ([self.currentTwitterView isEqualToString:@"deleted"]){
        NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"tweetDeleted == YES"];
        NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"deletedDate" ascending:NO];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
        [request setPredicate:testForTrue];
        [request setSortDescriptors:sortDescriptors];

        //Set filter and preicate for the Deleted tweets page
    } else if ([self.currentTwitterView isEqualToString:@"scheduled"]){
        NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"scheduledTweet == YES"];
        NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"scheduledDate" ascending:NO];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, nil];
        [request setPredicate:testForTrue];
        [request setSortDescriptors:sortDescriptors];
    }
    //Setup the Request
    [request setEntity:[NSEntityDescription entityForName:@"Tweet" inManagedObjectContext:_managedObjectContext]];

    //Assign the predicate to the fetch request
    NSError *error = nil;

    //Create an array from the returned objects
    NSArray *fetchedObjects = [_managedObjectContext executeFetchRequest:request error:&error];

    Tweet *selectedTweet = [fetchedObjects objectAtIndex:row];

    [cellView.textField setStringValue:[NSString stringWithFormat:@"Access granted for %@", selectedTweet.scheduledDate]];

    return cellView;

但是，我不能为我的生活找出如何定位单元格中的每个特定TextField，如果我创建一个IBOutlet然后我得到一个错误关于有多个（这是有道理的）但如果我不'这样做，然后我无法访问它，我可以看到。

我看过苹果类文档，但它也没有详细说明。

非常感谢！

干杯

加雷

Answer 1

https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/TableView/PopulatingView-TablesProgrammatically/PopulatingView-TablesProgrammatically.html#//apple_ref/doc/uid/10000026i-CH14-SW5

包含您需要的所有信息。

特别是标有以下部分的部分：

Acquiring a Cell from Interface Builder

在NSCellView中定位特定的NSTextField

1 个答案: