调用 applicationDidFinishLaunching 之前会发生什么？
我正在对我的 iPhone 应用程序进行性能测试，我注意到有时在启动时会花费 3-4 秒的时间才能开始看到 applicationDidFinishLaunching 中的 NSLogs。我已经优化了代码进入 applicationDidFinishLaunching 后发生的情况，但我不确定如何优化之前发生的情况。我使用的是 Default.png 初始屏幕，因此它基本上只是在进入 applicationDidFinishLaunching 并开始执行某些操作之前停顿在该屏幕上。
只是为了给你们一些背景信息，我没有 nib 文件，并且我正在使用核心动画，如果这有什么区别的话。我有大约 10 个不同的控制器，我的捆绑包总大小略低于 2MB。
I'm doing performance testing on my iphone app and I'm noticing that sometimes a good 3-4 secs elapse at startup before I start seeing my NSLogs from applicationDidFinishLaunching. I've optimized what happens once the code enters applicationDidFinishLaunching but I'm not sure how to optimize what goes on before that. I'm using a Default.png splash screen so it basically just stalls on that screen before it enters applicationDidFinishLaunching and starts doing something.
Just to give you guys some context, I have no nib files and I'm using core animation, if that makes any difference. I have about 10 different controllers and my total bundle size is just under 2MBs.
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尝试在不附加调试器的情况下运行它 - 它在启动时所做的事情之一就是等待连接到您的 Mac；）
如果您只是在没有连接 Mac 的设备中运行它，您还会看到延迟吗？
Try running it without the debugger attached - one of the things it does on startup is wait to connect to your mac ;)
If you just run it in the device without your mac connected do you still see the delay?
不久前我做了一些实验，发现大多数应用程序的默认启动时间是 3 秒或更长。
令我恼火的是，语音备忘录应用程序需要长达 10 秒的时间才能启动，此时我已经忘记了自己要说什么。我尝试编写一个启动速度更快的程序，通过使用 default.png 并自动开始录制，我得到了一个在 1-1.5 秒内不断启动的录音机。为了获得启动时间，我必须在界面激活之前启动记录器。
然而，在这项研究中，我发现大多数应用程序（例如直接从 Xcode 模板编译而无需修改的应用程序）可在 3-5 秒内启动。
基于这一事实，我想说你确实没有问题。启动时间在预期范围内。 deanWombourne 对调试器的观察很可能是正确的，而且可能使您的启动时间增加一两秒。
I did some experimentation a little while back and found that default start time for most apps is 3 seconds or more.
I was annoyed that the voice memo apps took up to 10 seconds to launch by which time I had forgotten what I was going to say. I tried to write one that would launch faster and by using a default.png and starting the recording automatically I got a recorder that constantly launched in 1-1.5 seconds. To get that launch time, I had to start the recorder before the interface became active.
However, in this research I found that most apps e.g. an app compiled straight from an Xcode template without modifications, launched in 3-5 seconds.
Based on that fact, I would say you really don't have a problem. The startup time falls in the expected range. deanWombourne's observation about the debugger is most likely correct and it probably adds a second or two to your startup time.