应用程序启动缓慢

发布于 2024-09-26 23:01:26 字数 808 浏览 3 评论 0原文

我的 iPhone 应用程序启动速度非常慢，我不知道为什么。我的 application:didFinishLaunchingWithOptions: 并不是很重，我只是为选项卡栏控制器的五个视图控制器中的每一个设置了 ManagedObjectContext 。

有人知道是什么原因导致启动缓慢吗？谢谢。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    mathRootViewController.managedObjectContext = self.managedObjectContext;
    favoriteRootViewController.managedObjectContext = self.managedObjectContext;
    chemistryRootViewController.managedObjectContext = self.managedObjectContext;
    physicsRootViewController.managedObjectContext = self.managedObjectContext;
    shareRootViewController.managedObjectContext = self.managedObjectContext;

    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible];


    return YES;
}

原文

My iphone app is launching very slowly, and I have no idea why. My application:didFinishLaunchingWithOptions: isn't really heavy, I'm just setting the managedObjectContext for each of my five view controllers of my tab bar controller.

Does anybody have an idea what causes the slow launch? Thanks.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    mathRootViewController.managedObjectContext = self.managedObjectContext;
    favoriteRootViewController.managedObjectContext = self.managedObjectContext;
    chemistryRootViewController.managedObjectContext = self.managedObjectContext;
    physicsRootViewController.managedObjectContext = self.managedObjectContext;
    shareRootViewController.managedObjectContext = self.managedObjectContext;

    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible];


    return YES;
}

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烟─花易冷 2024-10-03 23:01:27

在应用慢速目标的运行阶段启动应用程序，并将 DYLD_PRINT_STATISTICS 环境变量设置为 1，以打印出启动过程中缓慢的情况。打印输出将类似于：

    Total pre-main time: 2.2 seconds (100.0%)
     dylib loading time: 1.4 seconds (64.5%)
    rebase/binding time: 205.99 milliseconds (9.2%)
        ObjC setup time:  84.90 milliseconds (3.8%)
       initializer time: 496.64 milliseconds (22.3%)
       slowest intializers :
         libSystem.B.dylib :  21.82 milliseconds (0.9%)
      libglInterpose.dylib : 156.49 milliseconds (7.0%)
     libMTLInterpose.dylib :  47.01 milliseconds (2.1%)
                   AppName : 224.40 milliseconds (10.0%)

Apple 建议 400 毫秒。

来源：使用你的面包

Launch the application with the DYLD_PRINT_STATISTICS environment variable set to 1 on the run phase of your app slow target to get a print out of what's slow in the start up process. The print out will look something like:

    Total pre-main time: 2.2 seconds (100.0%)
     dylib loading time: 1.4 seconds (64.5%)
    rebase/binding time: 205.99 milliseconds (9.2%)
        ObjC setup time:  84.90 milliseconds (3.8%)
       initializer time: 496.64 milliseconds (22.3%)
       slowest intializers :
         libSystem.B.dylib :  21.82 milliseconds (0.9%)
      libglInterpose.dylib : 156.49 milliseconds (7.0%)
     libMTLInterpose.dylib :  47.01 milliseconds (2.1%)
                   AppName : 224.40 milliseconds (10.0%)

Apple recommends 400 milliseconds.

Source: Use Your Loaf

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无敌元气妹 2024-10-03 23:01:26

看起来你有一个非常大的初始 xib 文件，在启动时读取和解析该文件以填充 mathRootViewController 等。

尝试等到需要控制器后再加载它们，即将它们放入单独的 xib 文件中并添加看起来有点像这样的方法

- (UIViewController *)mathRootViewController {
    if (nil === mathRootViewController) {
        mathViewController = [[MathViewController alloc] initWithNibName:@"MathViewController" bundle:nil];
        [mathViewController setManagedObjectContext:[self managedObjectContext]];
    }
    return mathRootViewController;
}

，每次使用控制器时，不要只使用 mathRootViewController ;，而是使用 [self mathRootViewController ] - 此模式将等到您第一次需要视图控制器来创建它。

It looks like you have a very large initial xib file that's read and parsed on startup to populate mathRootViewController etc.

Try waiting until you controllers are needed before loading them i.e. put them in a seperate xib file and add methods that look a little like this

- (UIViewController *)mathRootViewController {
    if (nil === mathRootViewController) {
        mathViewController = [[MathViewController alloc] initWithNibName:@"MathViewController" bundle:nil];
        [mathViewController setManagedObjectContext:[self managedObjectContext]];
    }
    return mathRootViewController;
}

and each time you use the controller don't just use mathRootViewController ;, use [self mathRootViewController ] instead - this pattern will wait until the first time you need the view controller to create it.

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