当任何 iOS 应用程序启动时，首先调用哪个方法和函数？

Question

当任何 iOS 应用程序启动时，首先调用哪个方法和函数？

Answer 1

我想它

int main(int argc, char *argv[])

在 main.m 文件中，

但出于实际目的，我认为您通常需要实现一些 UIApplicationDelegate 的方法，具体取决于情况：

application:didFinishLaunchingWithOptions:
applicationDidBecomeActive:
applicationWillEnterForeground:

Answer 2

如果 View 启动，则为：

- (void)viewDidLoad {}

如果 app 启动，则为：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:

或者

- (void)applicationWillEnterForeground:(UIApplication *)application {

我认为您最好使用 ViewDidLoad 方法。

我希望我有所帮助！

Answer 3

实际上：

- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions{}

出现在：之前

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

Answer 4

应用启动期间调用的第一个函数

int main(int argc, char *argv[])

应用启动期间调用的第一个方法

application( _:willFinishLaunchingWithOptions:)

UIKit 处理大部分应用程序启动任务。

1) The app is launched, either explicitly by the user or implicitly by the system.

2) The Xcode-provided main function calls UIKit's UIApplicationMain() function.

3) The UIApplicationMain() function creates the UIApplication object and your app delegate.

4) UIKit loads your app's default interface from the main storyboard or nib file.

5) UIKit calls your app delegate's application(_:willFinishLaunchingWithOptions:) method.

6) UIKit performs state restoration, which calls additional methods of your app delegate and view controllers.

7) UIKit calls your app delegate's application(_:didFinishLaunchingWithOptions:) method.

参考 - https://developer. apple.com/documentation/uikit/app_and_environment/responding_to_the_launch_of_your_app/about_the_app_launch_sequence

Answer 5

当应用程序启动时，首先 application:didFinishLaunchingWithOptions:
方法被调用。

视图启动后

，viewDidLoad 被执行；

Answer 6

查看图像根据苹果文档

• (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:( NSDictionary *)launchOptions{}

之前被调用

• 在(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{}