Problems with NSTableView
I am working on learning Objective-C / Coaoa, but it seems like I got a bit stuck on getting the NSTableView object working for me. I followed all directions, but for some reason I still get this error:
Class 'RobotManager' does not implement the 'NSTableViewDataSource' protocol
Here's my source, tell me what you see wrong here, I'm about to rip my face off.
RobotManager.h
@interface RobotManager: NSObject {
// Interface vars
IBOutlet NSWindow * MainWindow;
IBOutlet NSTableView * RobotTable;
NSMutableArray * RobotList;
}
- (int) numberOfRowsInTableView: (NSTableView *) tableView;
- (id) tableView: (NSTableView *) tableView objectValueForTableColumn: (NSTableColumn *) tableColumn row: (int) rowIndex;
@end
RobotManager.m
#import "RobotManager.h"
@implementation RobotManager
- (void) awakeFromNib {
// Generate some dummy vals
[RobotList addObject: @ "Hello"];
[RobotList addObject: @ "World"];
[RobotTable setDataSource: self]; // This is where I'm getting the protocol warning
[RobotTable reloadData];
}
- (int) numberOfRowsInTableView: (NSTableView *) tableView {
return [RobotList count];
}
- (id) tableView: (NSTableView *) tableView objectValueForTableColumn: (NSTableColumn *) tableColumn row: (int) rowIndex {
return [RobotList objectAtIndex: rowIndex];
}
@end
I am running OS X 10.6.1 if that matters. Thanks in advance.
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Try changing your ad @interface
to the following:
@interface RobotManager : NSObject <NSTableViewDataSource> {
This will tell the compiler that the class is RobotManager
following the protocol NSTableViewDataSource
.
Edit:
Also, it is probably RobotList
not initialized until the two methods are NSTableViewDataSource
called. In other words, awakeFromNib
it is not called.
If there is no explicit call awakeFromNib
from some caller, RobotList
it will not initialize, so instead of filling RobotList
in this method, try filling it when RobotManager
first instantiated.
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On the one hand, data source methods now deal with NSInteger
s rather than int
s.
Moreover, if the deployment target is Mac OS X 10.6 or later, then you need to declare your data source class as a formal NSTableViewDataSource
protocol in your class @interface
. (This protocol and many others are new in 10.6; they were previously unofficial protocols.)
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