屏幕快照 2019-01-06 下午7.20.35.png

現(xiàn)在需要將其更改為在右邊，并將其圖片更改：

屏幕快照 2019-01-06 下午7.22.42.png

實現(xiàn)方法如下
1 自定義NSOutlineView

@interface LYOutlineView : NSOutlineView
@end

2 重寫- (void)layout方法

    [super layout];
    for (NSView *view in self.subviews) {
        for (NSView *subView in view.subviews) {
            if ([subView.identifier isEqualToString:NSOutlineViewDisclosureButtonKey]) {
                // 設置圖片
                NSButton *disclosure = (NSButton *)subView;
                disclosure.imageScaling = NSImageScaleProportionallyUpOrDown;
                disclosure.image = [NSImage imageNamed:@"jiantouyou"];
                disclosure.alternateImage = [NSImage imageNamed:@"jiantouxia"];
                // 設置frame
                CGFloat x = view.frame.size.width - 100;
                CGFloat y = disclosure.frame.origin.y;
                [disclosure setFrameOrigin:NSMakePoint(x, y)];
            }
        }
    }