awakeFromNib 完成后子视图消失

Question

我有一个带有 NSBox 子视图的视图（启用了 CA 阴影），并且我尝试在 awakeFromNib 期间动态将我的 NSView 子类添加到框中。

根据用户的不同，这些 NSView 的数量也会有所不同，因此我编写了一些代码来确定需要多少行和列才能将它们很好地排列在框中。 （我已经考虑过 NSMatrix，但它没有按照我想要的方式布局）

问题是，在 awakeFromNib 方法完成后，子视图突然消失！ 我已经放置了大量 NSLog 语句来尝试跟踪它，我发现的只是子视图在消失之前显然已添加到 NSBox 中。运行应用程序时，子视图会短暂出现，然后在动画完成后消失。

这是我的 awakeFromNib 方法：

-(void)awakeFromNib
{
    //Fill an array with buttons for each company object
    buttons = [[NSMutableArray alloc] init];
    for (BCCompany *c in [[[BCParser sharedParser] managedObjectContext]     fetchObjectsForEntityName:@"BCCompany" withPredicate:nil andSortDescriptor:nil])
    {
        CompanyButton *button = [[CompanyButton alloc] initWithFrame:NSMakeRect(0, 0, 150,     150)];
        [button setCompanyName:[c name]];
        [buttons addObject:button];
    }

    //Determine how many columns we can fit across the window -- 100px padding on each side --     150px width for each button
    int noOfColumns = ([[self view] frame].size.width - 200) / 150;
    if ([buttons count] < noOfColumns)
        noOfColumns = [buttons count];

    //Determine how many rows will be needed
    int noOfRows = ([buttons count] + noOfColumns - 1) / noOfColumns;

    //Resize and reposition the box
    [whiteBox setFrameSize:NSMakeSize((noOfColumns * 150) + 60, (noOfRows * 150) + 20)];
    [whiteBox setFrameOrigin:NSMakePoint(NSMidX([[self view] frame]) - ([whiteBox     frame].size.width/2), NSMidY([[self view] frame]) - ([whiteBox frame].size.height/2) - 100)];


    //Now iterate through each row and add items, checking if it's the last row
    subviewsToAdd = [[NSMutableArray alloc] init];
    for (int i=0; i<noOfRows; i++)
    {
        NSRect boxRect = [whiteBox frame];
        NSArray *tempArray = [[NSArray alloc] init];

        if (i == (noOfRows-1)) {
            //Final row
            tempArray = [buttons subarrayWithRange:NSMakeRange(i*noOfColumns, [buttons     count])];
            for (int j=0; j<[tempArray count]; j++)
            {
                //Iterate through the remaining buttons and add them
                NSPoint buttonOrigin = NSMakePoint(5 + (j * 150),     (boxRect.size.height) - (150 * (i+1)));
                NSRect buttonRect = NSMakeRect(buttonOrigin.x, buttonOrigin.y,     150, 150);
                [[tempArray objectAtIndex:j] setFrame:buttonRect];
                NSLog(@"%@ Frame -- X:%f   Y:%f  --  j:%i", [[tempArray     objectAtIndex:j] companyName], [[tempArray objectAtIndex:j] frame].origin.x, [[tempArray     objectAtIndex:j] frame].origin.y, j);
                [subviewsToAdd addObject:[tempArray objectAtIndex:j]];
            }
        } else {
            //Not the final row
            tempArray = [buttons subarrayWithRange:NSMakeRange(i*noOfColumns,     noOfColumns)];
            for (int j=0; j<noOfColumns; j++)
            {
                //Position each one on this row
                NSPoint buttonOrigin = NSMakePoint(5 + (j * 150),     (boxRect.size.height) - (150 * (i+1)) - 10);
                NSRect buttonRect = NSMakeRect(buttonOrigin.x, buttonOrigin.y, 150,     150);
                [[tempArray objectAtIndex:j] setFrame:buttonRect];
                [subviewsToAdd addObject:[tempArray objectAtIndex:j]];
            }
        }
    }
    [whiteBox setSubviews:subviewsToAdd];
    [whiteBox setNeedsDisplay:YES];
}

对此的任何帮助将不胜感激！

史蒂夫

Answer 1

在 NSView 的 -setSubviews 文档中：

此方法标记受影响的视图
和需要显示的窗口区域。

如果您不在 whiteBox 上再次调用 -setNeedsDisplay 会发生什么？