如何在MacCatalyst上禁用全屏按钮

奥列格·拜达卡（Oleg Baidalka）

目前，我要停止调整窗口大小：

#if targetEnvironment(macCatalyst)
windowScene.sizeRestrictions?.minimumSize = CGSize(width: 480, height: 900)
windowScene.sizeRestrictions?.maximumSize = CGSize(width: 480, height: 900)
#endif

let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: contentView)
self.window = window
window.makeKeyAndVisible()

但全屏按钮仍然使其全屏显示。

他的脾气

这有点复杂，但可能。这是一种方法（我删除了所有目标宏以简化发布）。

结果：

在此处输入图片说明

码：

// on next event after UIWindow has made key it is possible to find NSWindow in runtime

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        ...
        window.makeKeyAndVisible()

        DispatchQueue.main.async { // < wait for NSWindow available
            SilentBridge.disableCloseButton(for: self.nsWindow(from: window))
        }
    }

// added helper function to SceneDelegate to find NSWindow

    func nsWindow(from window: UIWindow) -> NSObject? {
        guard let nsWindows = NSClassFromString("NSApplication")?.value(forKeyPath: "sharedApplication.windows") as? [NSObject] else { return nil }
        for nsWindow in nsWindows {
            let uiWindows = nsWindow.value(forKeyPath: "uiWindows") as? [UIWindow] ?? []
            if uiWindows.contains(window) {
                return nsWindow
            }
        }
        return nil
    }

首选Objective-C部分（使用未声明的选择器更简单）。通过Xcode模板添加新的Objective-C类，并确认创建网桥。之后，需要在生成的类头文件下面添加它，*-Bridging-Header.h并且所有文件都应该工作。

// SilentBridge.h

@import Foundation;

@interface SilentBridge : NSObject
+ (void)disableCloseButtonFor:(NSObject  * _Nullable)window;
@end

// SilentBridge.m

#import "SilentBridge.h"
@import Foundation;

// Forward declarations to allow direct calls in below method
@interface NSObject(SilentBridge) 
- (id)standardWindowButton:(NSInteger)value;
- (void)setEnabled:(BOOL)flag;
@end

@implementation SilentBridge

+ (void)disableCloseButtonFor:(NSObject *)window {
    if ([window respondsToSelector:@selector(standardWindowButton:)]) {
        id closeButton = [window standardWindowButton:2];
        if ([closeButton respondsToSelector:@selector(setEnabled:)]) {
            [closeButton setEnabled:NO];
        }
    }
}
@end