Cocoa如何设置最大窗口高度但保留宽度

// 创建窗口对象
NSWindow *window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 800, 600)
                                          styleMask:NSWindowStyleMaskTitled | NSWindowStyleMaskResizable
                                          backing:NSBackingStoreBuffered
                                          defer:NO];

// 设置窗口的最大高度
CGFloat maxHeight = 800;
NSRect frame = [window frame];
frame.size.height = MIN(frame.size.height, maxHeight);
[window setFrame:frame display:YES];

// 保留窗口的宽度
CGFloat aspectRatio = frame.size.width / frame.size.height;
[window setAspectRatio:NSMakeSize(aspectRatio, 0)];

// 显示窗口
[window makeKeyAndOrderFront:nil];