最简单的一个方法NSPanel项目下载地址

#import <Cocoa/Cocoa.h>NS_ASSUME_NONNULL_BEGIN@interface myWindow : NSPanel@endNS_ASSUME_NONNULL_END

#import "myWindow.h"@implementation myWindow- (instancetype)initWithContentRect:(NSRect)contentRectstyleMask:(NSWindowStyleMask)aStylebacking:(NSBackingStoreType)bufferingTypedefer:(BOOL)flag{self = [super initWithContentRect:contentRectstyleMask:aStylebacking:bufferingTypedefer:flag];if (self) {[self setHasShadow:YES];[self setOpaque:NO];[self setBackgroundColor:[NSColor clearColor]];[self setMovableByWindowBackground:NO];//注意[self setLevel:NSScreenSaverWindowLevel];self.styleMask = NSWindowStyleMaskBorderless | NSWindowStyleMaskNonactivatingPanel;self.animationBehavior = (CGWindowLevelForKey(NSMainMenuWindowLevel));//能加入所以活动空间以及在全屏应用上边显示self.collectionBehavior = NSWindowCollectionBehaviorCanJoinAllSpaces | NSWindowCollectionBehaviorFullScreenAuxiliary;if (@available(macOS 10.14, *)) {self.appearance  = [NSAppearance appearanceNamed:NSAppearanceNameVibrantLight];} else {// Fallback on earlier versions}[self invalidateShadow];}return self;
}- (void)setContentView:(__kindof NSView *)contentView{contentView.wantsLayer            = YES;contentView.layer.frame           = contentView.frame;contentView.layer.cornerRadius    = 5.0;contentView.layer.masksToBounds   = YES;[super setContentView:contentView];
}- (BOOL)canBecomeKeyWindow{return YES;
}- (BOOL)canBecomeMainWindow{return YES;
}@end