AppDelegate.m 生命周期-优快云博客

本文详细介绍了iOS应用程序的各种生命周期状态，包括启动、进入后台、获得焦点等，并解释了每个状态的应用场景及开发者应如何处理。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

AppDelegate.m


//
//  AppDelegate.m
//  FirstIOS
//
//  Created by MaTsonga on 14-2-23.
//  Copyright (c) 2014年 MaTsonga. All rights reserved.
//

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate
            

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    NSLog(@"程序已经启动...");
    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
    NSLog(@"程序将要失去焦点...");
    // 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 {
    NSLog(@"程序已经进入后台...");
    // 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 {
    NSLog(@"程序将要进入前台...");
    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
    NSLog(@"程序已经获得焦点...");
    // 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 {
    NSLog(@"程序将要终止...");
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

-(void)applicationDidReceiveMemoryWarning:(UIApplication *)application{
    
}

@end

下面是各个不同操作的运行结果：