NSWindowController 和 NSWindow 的关系

[self.myWindowController showWindow:self];

#import "MainWindowController.h"@interface AppDelegate ()@property (nonatomic, strong) NSWindowController *myWindowController;@property (nonatomic, strong) NSWindow           *myWindow;@end@implementation AppDelegate-(NSWindowController *)myWindowController{    if (!_myWindowController) {        _myWindowController = [[NSWindowController alloc]init];        _myWindowController.window = self.myWindow;        self.myWindow.windowController = _myWindowController;    }    return _myWindowController;}-(NSWindow *)myWindow{    if (!_myWindow) {        _myWindow = [[NSWindow alloc]initWithContentRect:CGRectMake(0, 0, 400, 300) styleMask:1 backing:2 defer:NO];    }    return _myWindow;}- (void)windowDidLoad {    [super windowDidLoad];    [self.myWindow makeKeyAndOrderFront:self];}-(void)dealloc{    NSLog(@"%s",__func__);}@end