Question

我有一个基于文档的应用程序，它有两个类，myDocument和Person。界面包括用于显示数据的表视图和用于在表中添加和删除peson的两个按钮。 myDocument类是数据源和委托。我已经实现了必要的委托方法，但是当我单击按钮向表中添加记录时，表视图不会显示更改。有人能告诉我我做错了吗？

#import "MyDocument.h"

@implementation MyDocument

- (id)init
{
    self = [super init];
    if (self) {

        // Add your subclass-specific initialization here.
        // If an error occurs here, send a [self release] message and return nil.
    _dataArray = [[NSMutableArray alloc]init];
    }
    return self;
}
-(IBAction)addPerson:(id)sender
{
 Person *newPerson = [[Person alloc] init];
 [_dataArray addObject:newPerson];

 NSLog(@" how many objects are in the table? %d",[_dataArray count]);
 //[newPerson release];
 [_tableView reloadData];
}
-(int)numberOfRowsInTableView:(NSTabView*)aTableView
{
 return [_dataArray count];
}


- (void)tableView:(NSTableView *)aTableView 
  willDisplayCell:(id)aCell 
   forTableColumn:(NSTableColumn *)aTableColumn 
     row:(NSInteger)rowIndex
{
 [_dataArray objectAtIndex:rowIndex];
 NSLog(@" this is the object? %@",[_dataArray objectAtIndex:rowIndex]);
 [_tableView reloadData];
}
- (id) tableView:(NSTableView *)aTableView
objectValueForTableColumn:(NSTableColumn *)aTableColumn
    row:(int)rowIndex
{
 //NSLog(@"this is the object %@",[array objectAtIndex:rowIndex]);
 NSLog(@"this is what is in the array %@",[_dataArray objectAtIndex:rowIndex]);
 return [_dataArray objectAtIndex:rowIndex];
 //return [array replaceObjectAtIndex:[tableView selectedRow ]  withObject: @"Micheal jordan"];
}

- (NSString *)windowNibName
{
    // Override returning the nib file name of the document
    // If you need to use a subclass of NSWindowController or if your document supports multiple NSWindowControllers, you should remove this method and override -makeWindowControllers instead.
    return @"MyDocument";
}

- (void)windowControllerDidLoadNib:(NSWindowController *) aController
{
    [super windowControllerDidLoadNib:aController];
    // Add any code here that needs to be executed once the windowController has loaded the document's window.
}

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError
{
    // Insert code here to write your document to data of the specified type. If the given outError != NULL, ensure that you set *outError when returning nil.

    // You can also choose to override -fileWrapperOfType:error:, -writeToURL:ofType:error:, or -writeToURL:ofType:forSaveOperation:originalContentsURL:error: instead.

    // For applications targeted for Panther or earlier systems, you should use the deprecated API -dataRepresentationOfType:. In this case you can also choose to override -fileWrapperRepresentationOfType: or -writeToFile:ofType: instead.

    if ( outError != NULL ) {
  *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
 }
 return nil;
}

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError
{
    // Insert code here to read your document from the given data of the specified type.  If the given outError != NULL, ensure that you set *outError when returning NO.

    // You can also choose to override -readFromFileWrapper:ofType:error: or -readFromURL:ofType:error: instead. 

    // For applications targeted for Panther or earlier systems, you should use the deprecated API -loadDataRepresentation:ofType. In this case you can also choose to override -readFromFile:ofType: or -loadFileWrapperRepresentation:ofType: instead.

    if ( outError != NULL ) {
  *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
 }
    return YES;
}

@end

Answer 1

检查_tableView插座是否实际被初始化为指向表视图。

为什么我的表视图不显示我的数据？

1 个答案: