NSView实现右键菜单

 在macOS中，NSView有一个menu的属性，给这个属性进行赋值，即可实现右键弹出菜单

    NSMenu *menu = [[NSMenu alloc]initWithTitle:@"打开"];

    [menuaddItem:[[NSMenuItem alloc]initWithTitle:@"功能1" action:@selector(menuclick:) keyEquivalent:@"6"]];

    [menuaddItem:[[NSMenuItem alloc]initWithTitle:@"功能2" action:@selector(menuclick:) keyEquivalent:@"7"]];

    self.view.menu= menu;

- (void)menuclick:(NSMenuItem*)item

{

}