Question

我想在NSTabViewItem添加一个带有一些文字的图标。

请帮助我使用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;
}

我可以在NSTabViewItem添加一个图标，但由于图标很大，所以图标会从标签中显示出来。如何将图标大小保持在TabViewItem？

之内

Answer 1

不确定，如果您的问题得到解决，我有类似的用例，我正在使用drawLabel并附加图片，

参考代码段，

- (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]);

}

Answer 2

此代码对我有用（快速3）：

{{1}}

未经充分测试，如果iconWidth更改，您可能必须更改某些常量。

Answer 3

基于Amitg2k12的示例并添加了一些内容：


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

    if (self) {
        [self setToolTip:[self label]];
        [self setLabel:@" "];
    }

    return self;
}

- (NSSize)sizeOfLabel:(BOOL)computeMin {
    return NSMakeSize(16, 18);
}

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect {
    NSImage *image = [self image];

    NSRect destRect = NSMakeRect(tabRect.origin.x, tabRect.origin.y + 2, 16, 16);

    [[NSGraphicsContext currentContext] saveGraphicsState];
    NSAffineTransform *affineTransform = [NSAffineTransform transform];
    [affineTransform translateXBy:NSMaxX(destRect) yBy:NSMinY(destRect)];
    [affineTransform scaleXBy:1.0 yBy:-1.0];
    [affineTransform concat];

    if(image) {
        [image drawInRect:NSMakeRect(-NSWidth(destRect), -NSHeight(destRect), 16, 16) fromRect:NSZeroRect
                operation:NSCompositeSourceOver
                 fraction:1.0f];
    }

    [[NSGraphicsContext currentContext] restoreGraphicsState];
    [super drawLabel:shouldTruncateLabel inRect:tabRect];
}

@end

cocoa：如何使用drawlabel：inRect in cocoa方法向NSTabViewItem添加一个图标？

3 个答案: