相关疑难解决方法(0)

我试图继承NSOutlineView.这是我的代码:

OutlineViewSublcass.h:

#import <Cocoa/Cocoa.h>

@interface OutlineViewSubclass : NSOutlineView {

}

@end

OutlineViewSubclass.m:

#import "OutlineViewSubclass.h"

@implementation OutlineViewSubclass

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    printf("debug A\n");
    return self;
}

- (void)awakeFromNib
{
    printf("debug B\n");
}

@end

调试输出是:

debug B

为什么不(id)initWithFrame:(NSRect)frame被召唤？