在选择时更改NSTextFieldCell背景颜色

- (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
    // 设置单元格边框为红色
    NSColor *borderColor = [NSColor redColor];
    NSBezierPath *borderPath = [NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0, 0, cellFrame.size.width, cellFrame.size.height) cornerRadius:0];
    [borderPath setLineWidth:1];
    [borderColor set];
    [borderPath stroke];

    // 设置单元格背景色
    NSColor *backgroundColor = [NSColor blueColor];
    NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0, 0, cellFrame.size.width, cellFrame.size.height) cornerRadius:0];
    [path fill];
}

// 创建一个自定义的 NSTextFieldCell 实例
CustomTextFieldCell *customTextFieldCell = [[CustomTextFieldCell alloc] init];

// 将自定义的 NSTextFieldCell 实例添加到 NSTextField 中
[myTextField setCell:customTextFieldCell];