如何用进度指示单元格OSX制作像洪流一样的可下载文件表格？Objective-C

// 导入必要的头文件
#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate>

@property (nonatomic, strong) NSWindow *window;
@property (nonatomic, strong) NSProgressIndicator *progressIndicator;

@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // 创建窗口
    self.window = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 400, 200)
                                              styleMask:NSWindowStyleMaskTitled
                                                backing:NSBackingStoreBuffered
                                                  defer:NO];
    [self.window setTitle:@"下载文件表格"];
    
    // 创建进度指示器
    self.progressIndicator = [[NSProgressIndicator alloc] initWithFrame:NSMakeRect(50, 100, 300, 20)];
    [self.progressIndicator setMinValue:0];
    [self.progressIndicator setMaxValue:100];
    [self.progressIndicator setIndeterminate:NO];
    [self.progressIndicator setStyle:NSProgressIndicatorStyleBar];
    
    // 添加进度指示器到窗口
    [self.window.contentView addSubview:self.progressIndicator];
    
    // 模拟下载进度更新
    [NSTimer scheduledTimerWithTimeInterval:0.1
                                     target:self
                                   selector:@selector(updateProgress)
                                   userInfo:nil
                                    repeats:YES];
    
    // 显示窗口
    [self.window makeKeyAndOrderFront:nil];
}

- (void)updateProgress {
    // 更新进度指示器的值
    CGFloat progress = [self.progressIndicator doubleValue] + 1;
    [self.progressIndicator setDoubleValue:progress];
    
    // 下载完成后停止更新
    if (progress >= 100) {
        [self.progressIndicator stopAnimation:nil];
    }
}

@end

int main(int argc, const char * argv[]) {
    // 创建应用程序对象
    NSApplication *application = [NSApplication sharedApplication];
    
    // 创建代理对象
    AppDelegate *delegate = [[AppDelegate alloc] init];
    
    // 设置应用程序代理
    [application setDelegate:delegate];
    
    // 运行应用程序
    [application run];
    
    return 0;
}