你會如何給大綱視圖交替行顏色？

Question

我知道IB中有一個複選框，但它只給你白色和藍色的顏色。我將如何使它使用不同的顏色？

Answer 1

我發現這個代碼吧，

// RGB values for stripe color (light blue) 
#define STRIPE_RED (237.0/255.0) 
#define STRIPE_GREEN (243.0/255.0) 
#define STRIPE_BLUE (254.0/255.0) 
static NSColor *sStripeColor = nil; 

    @implementation … 

// This is called after the table background is filled in, 
// but before the cell contents are drawn. 
// We override it so we can do our own light-blue row stripes a la iTunes. 
- (void) highlightSelectionInClipRect:(NSRect)rect { 
    [self drawStripesInRect:rect]; 
    [super highlightSelectionInClipRect:rect]; 
} 

// This routine does the actual blue stripe drawing, 
// filling in every other row of the table with a blue background 
// so you can follow the rows easier with your eyes. 
- (void) drawStripesInRect:(NSRect)clipRect { 
    NSRect stripeRect; 
    float fullRowHeight = [self rowHeight] + [self intercellSpacing].height; 
    float clipBottom = NSMaxY(clipRect); 
    int firstStripe = clipRect.origin.y/fullRowHeight; 
    if (firstStripe % 2 == 0) 
     firstStripe++; // we're only interested in drawing the stripes 
         // set up first rect 
    stripeRect.origin.x = clipRect.origin.x; 
    stripeRect.origin.y = firstStripe * fullRowHeight; 
    stripeRect.size.width = clipRect.size.width; 
    stripeRect.size.height = fullRowHeight; 
    // set the color 
    if (sStripeColor == nil) 
     sStripeColor = [[NSColor colorWithCalibratedRed:STRIPE_RED 
          green:STRIPE_GREEN 
          blue:STRIPE_BLUE 
          alpha:1.0] retain]; 
    [sStripeColor set]; 
    // and draw the stripes 
    while (stripeRect.origin.y < clipBottom) { 
     NSRectFill(stripeRect); 
     stripeRect.origin.y += fullRowHeight * 2.0; 
    } 
} 

但我不知道如何子類NSOutlineView。有人能告訴我如何能夠分類NSOutline View嗎？

Answer 2

This article關於用於TableView（可可不可可可觸摸）的漸變可能會給你一些指示如何去做。