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我正在尝试在 IKImageBrowserCell 对象内的图层上添加 NSButton。我发现这篇文章很有帮助,但它没有进入症结所在。我已经尝试过这个:

- (CALayer *) layerForType:(NSString*) type
{
    CGColorRef color;

    //retrieve some usefull rects
    NSRect frame = [self frame];
    NSRect imageFrame = [self imageFrame];
    NSRect relativeImageFrame = NSMakeRect(imageFrame.origin.x - frame.origin.x, imageFrame.origin.y - frame.origin.y, imageFrame.size.width, imageFrame.size.height);

    /* foreground layer */
    if(type == IKImageBrowserCellForegroundLayer){
        //no foreground layer on place holders
        if([self cellState] != IKImageStateReady)
            return nil;

        //create a foreground layer that will contain several childs layer
        CALayer *layer = [CALayer layer];
        layer.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);


        //add a checkbox to tell whether to upload this one or not
        NSRect checkFrame  = NSMakeRect( ( frame.size.width/2)-5 , frame.size.height - 19, 18,18);
        NSButton *uploadCheckBox = [[NSButton alloc] initWithFrame:checkFrame];
        [uploadCheckBox setButtonType:NSSwitchButton];
        [layer addSublayer :[uploadCheckBox layer]];

        return layer;
    }
    //(...)
    return nil;
}

但不幸的是,该按钮没有出现在图层上。我认为按钮的位置很好,因为它基于 Apple 应用程序的示例代码。我感觉这条线是错误的: layer addSublayer :[uploadCheckBox layer]];,因为我应该添加整个 NSButton,而不仅仅是它的位图表示(一层)。非常感谢任何帮助!

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1 回答 1

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您不能在 CALayer 中添加 NSView。您应该为您的按钮目的创建一个新层并添加到您的保持层。

于 2015-02-04T07:43:06.290 回答