如何在appDelegate Objective-C中显示弹出视图和取消视图

在appDelegate Objective-C中显示弹出视图和取消视图可以通过以下步骤实现：

导入相关的头文件：

#import "ViewController.h"
#import "PopupViewController.h"

在application:didFinishLaunchingWithOptions:方法中创建弹出视图的实例，并设置其样式和内容：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 创建弹出视图的实例
    PopupViewController *popupViewController = [[PopupViewController alloc] init];
    
    // 设置弹出视图的样式和内容
    popupViewController.modalPresentationStyle = UIModalPresentationOverFullScreen;
    popupViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    popupViewController.popupText = @"这是一个弹出视图";
    
    // 显示弹出视图
    [self.window.rootViewController presentViewController:popupViewController animated:YES completion:nil];
    
    return YES;
}

在PopupViewController类中定义弹出视图的样式和内容：

@interface PopupViewController : UIViewController

@property (nonatomic, strong) NSString *popupText;

@end

@implementation PopupViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建弹出视图的背景
    UIView *backgroundView = [[UIView alloc] initWithFrame:self.view.bounds];
    backgroundView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
    [self.view addSubview:backgroundView];
    
    // 创建弹出视图
    UIView *popupView = [[UIView alloc] initWithFrame:CGRectMake(50, 200, self.view.bounds.size.width - 100, 200)];
    popupView.backgroundColor = [UIColor whiteColor];
    [self.view addSubview:popupView];
    
    // 创建弹出视图的文本标签
    UILabel *popupLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, popupView.bounds.size.width, popupView.bounds.size.height)];
    popupLabel.text = self.popupText;
    popupLabel.textAlignment = NSTextAlignmentCenter;
    [popupView addSubview:popupLabel];
    
    // 创建取消按钮
    UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeSystem];
    cancelButton.frame = CGRectMake(0, popupView.bounds.size.height - 50, popupView.bounds.size.width, 50);
    [cancelButton setTitle:@"取消" forState:UIControlStateNormal];
    [cancelButton addTarget:self action:@selector(cancelButtonTapped) forControlEvents:UIControlEventTouchUpInside];
    [popupView addSubview:cancelButton];
}

- (void)cancelButtonTapped {
    // 取消弹出视图
    [self dismissViewControllerAnimated:YES completion:nil];
}

@end

通过以上步骤，你可以在appDelegate Objective-C中显示一个弹出视图，并且点击取消按钮可以取消弹出视图的显示。请注意，以上代码仅为示例，实际使用时可能需要根据具体需求进行适当的修改和调整。

关于腾讯云相关产品和产品介绍链接地址，由于要求不能提及具体品牌商，无法给出相关链接。但腾讯云提供了丰富的云计算服务，你可以访问腾讯云官方网站获取更多信息。