NSOutlineView没有做它应该做的它的子类

Question

我创建了一个NSOutlineView的子类，并使用下面的代码使行颜色交替。

头文件。

#import <Cocoa/Cocoa.h> 


@interface MyOutlineView : NSOutlineView { 
} 

- (void) drawStripesInRect:(NSRect)clipRect; 

@end 

执行文件。

#import "MyOutlineView.h" 

// 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 MyOutlineView 

// 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; 
    } 
} 

@end 

但问题是，什么样的代码是应该做的不会发生在大纲视图，代码是正确的，但我需要的大纲视图连接到的代码是某种方式？

Answer 1

如果您在IB中实例化大纲视图，则需要在大纲检查器中将大纲视图的类名称设置为“MyOutlineView”。请记住双击控件，以便选择内部矩形，检查器窗口标题为“轮廓视图标识”;只需单击一下控件即可选择滚动视图（大纲视图嵌入在滚动视图中）。

如果编程创建您的大纲视图，只是一定要实例化的MyOutlineView而不是NSOutlineView：

MyOutlineView *outlineView = [[MyOutlineView alloc] initWithFrame:rect]; 

其中rect是你的大纲视图的框架。