objective-c - cocoa : how to add an icon to NSTabViewItem using the method drawlabel:inRect in cocoa?

Question

我想向 NSTabViewItem 添加一个带有一些文本的图标。

请帮我解决 drawLabel:inRect: 方法中的代码。

- (id)initWithCoder:(NSCoder *)decoder
{
[super initWithCoder:decoder];

tabCell = [[NSBrowserCell alloc] initImageCell:[NSImage 
imageNamed:@"xyz"]];

[tabCell setLeaf:YES];
[tabCell setFont:[[self tabView] font]];
[tabCell setStringValue: [self label]];

return self;
}

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect
{
{ //  modify the rect a tad so the cell draws properly..
    tabRect.origin.y += 2;
    tabRect.size.width += 16;
}

[tabCell drawWithFrame:tabRect inView:[self tabView]];
}


- (NSSize)sizeOfLabel:(BOOL)shouldTruncateLabel
{
NSSize superSize = [super sizeOfLabel:shouldTruncateLabel];
NSImage *icon = [tabCell image];

superSize.width += [icon size].width-4;

return superSize;
}

我可以向 NSTabViewItem 添加一个图标，但该图标由于尺寸太大而从选项卡中出来。如何保持图标的大小保持在 TabViewItem 内？

Answer 1

不确定，如果您的问题得到解决，我有类似的用例，并且我正在使用drawLabel并在其中附加图像，

引用代码片段，

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect{


    NSImage *pImage = [self getImage];

    [[NSGraphicsContext currentContext] saveGraphicsState];
    NSAffineTransform* xform = [NSAffineTransform transform];
    [xform translateXBy:0.0 yBy: tabRect.size.height];
    [xform scaleXBy:1.0 yBy:-1.0];
    [xform concat]; 


    if(pImage){
        [pImage drawInRect:NSMakeRect(tabRect.origin.x-8,-6,16, 16)fromRect:NSZeroRect
                 operation:NSCompositeSourceOver
                  fraction:opacity];
    }
     [[NSGraphicsContext currentContext] restoreGraphicsState];
    [super drawLabel:shouldTruncateLabel inRect:tabRect];
    NSLog(@" Inside drawRect text (%@)",[self labeltitle]);

}