NSTableView不显示objectValueForTableColumn方法的返回值

Question

无论我返回什么,表视图将只显示.xib文件中手动设置的显示文本(NSTextField的'Title').请帮我弄清楚我做错了什么.谢谢.

我的NSTableView只有1列.

这是代码:

#import "DeviceSettingsController.h"
#import <ImageCaptureCore/ImageCaptureCore.h>

@interface DeviceSettingsController ()
@property (weak) IBOutlet NSTableView *tableViewScanners;
@property (weak) IBOutlet NSMatrix *checkBoxes;
@property NSMutableArray *availableScanners;
@property ICDeviceBrowser *deviceBrowser;
@end

@implementation DeviceSettingsController

- (void)viewDidLoad {
    [super viewDidLoad];
    _availableScanners = [[NSMutableArray alloc] init];
    _deviceBrowser = [[ICDeviceBrowser alloc] init];
    _tableViewScanners.delegate = self;
    _tableViewScanners.dataSource = self;
    _deviceBrowser.browsedDeviceTypeMask = ICDeviceTypeMaskScanner | ICDeviceLocationTypeMaskLocal | ICDeviceLocationTypeMaskShared | ICDeviceLocationTypeMaskBluetooth | ICDeviceLocationTypeMaskBonjour;
    _deviceBrowser.delegate = self;
    [_deviceBrowser start];    
}

- (id)initWithMainView:(NSView *)_theView AndMainController:(NSViewController *)_theViewController AndNibName:(NSString *)nibName AndArgs:(NSArray *)_args {
    self = [super initWithMainView:_theView AndMainController:_theViewController AndNibName:nibName AndArgs:_args];
    return self;
}

- (void)deviceBrowser:(ICDeviceBrowser *)browser didAddDevice:(ICDevice *)device moreComing:(BOOL)moreComing {
    [_availableScanners addObject:device];
    [_tableViewScanners reloadData];
}

- (void)deviceBrowser:(ICDeviceBrowser *)browser didRemoveDevice:(ICDevice *)device moreGoing:(BOOL)moreGoing {
    [_availableScanners removeObject:device];
    [_tableViewScanners reloadData];
}

- (void)didRemoveDevice:(ICDevice *)device {

}

- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {
    return [_availableScanners count];
}

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row {
    NSString *retVal = [((ICScannerDevice *)[_availableScanners objectAtIndex:row]) name];

    return retVal;
}
@end

Answer 1

tableview内容模式是基于单元格还是基于视图？我假设它是基于视图的,因为你提到了一个xib,因此你不得不使用objectValueForTableColumn(Cell Based)

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

另请参阅Apple Docs,因此典型的实现方式如下

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

      // Retrieve to get the @"MyView" from the pool or,
      // if no version is available in the pool, load the Interface Builder version
      NSTableCellView *result = [tableView makeViewWithIdentifier:@"MyView" owner:self];

      // Set the stringValue of the cell's text field to the nameArray value at row
      result.textField.stringValue = [self.nameArray objectAtIndex:row];

      // Return the result
      return result;
}