从Xcode启动iOS模拟器并获得黑屏，随后Xcode挂起并无法停止任务

Question

我在iOS模拟器中运行我的基本iPhone应用程序（同时通过斯坦福iTunes CS193p讲座）遇到了麻烦。

我已经搜索了一段时间（谷歌和其他），但无法找到一个解决方案到目前为止。有很多类似的bug，但是解决方案似乎并没有修复这个问题。

在Xcode中，我单击“Run”。它编译和构建成功，启动iOS模拟器，但它从来没有加载应用程序。只有顶部的状态栏。带着黑屏。

我只写了非常基本的代码（跟着讲课），无法解决这个问题。

为了更好地混淆问题，在这些讲座之前，我编写了一个web包装器(UIWebView)，它工作得很好。但代码几乎没有任何区别。我从头开始创建的所有新应用程序都因同样的黑屏问题而失败。

这就好像Xcode已经失去了与iOS模拟器对话的能力，并假设它正在运行（即使我退出了iOS模拟器）。我尝试退出Xcode，它要求我停止任务。然后它就挂了。所以我必须强制重启才能退出Xcode。

我使用的是：OSX 10.8.2 Xcode 4.5.2 iOS模拟器6.0

CalculatorAppDelegate.h

#import <UIKit/UIKit.h>

@interface CalculatorAppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@end

#import "CalculatorAppDelegate.h"

@implementation CalculatorAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions (NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application
{
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application
{
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application
{
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end

#import <UIKit/UIKit.h>

@interface CalculatorViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *display;

@end

计算器ViewController.m

#import "CalculatorViewController.h"

@implementation CalculatorViewController

@synthesize display = _display;

- (IBAction)digitPressed:(UIButton *)sender
{
    NSString *digit = [sender currentTitle];
NSLog(@"digit pressed = %@", digit);
}

@end

Answer 1

令人惊讶的是，对我起作用的是去iOS模拟器菜单，按下“重置内容和设置”。（在iOS 13中，its under Hardware）