iOS学习应用程序对象介绍AppDelegate 信息提醒

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#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

#pragma mark - 应用程序加载完成

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

NSLog(@"应用程序加载完成");

// Override point for customization after application launch.

return YES;

}

#pragma mark - 即将非活跃状态(即将失去焦点)

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

NSLog(@"即将非活跃状态(即将失去焦点)");

// 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.

// OpenGL open Graphics Library

}

#pragma mark - 应用程序进入后台

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

NSLog(@"应用程序进入后台");

// Use this method to release shared resources, save user data, invalidate timers, and store 储存 enough application state information to restore 恢复 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.

}

#pragma mark - 即将进入前台

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

NSLog(@"即将进入前台");

// 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.

}

#pragma mark - 称为活跃状态(获取焦点)可以让用户操作

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

NSLog(@"称为活跃状态(获取焦点)可以让用户操作");

// 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.

}

#pragma mark - 应用即将被销毁的时候调用

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

NSLog(@"应用即将被销毁的时候调用");

// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

}

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

NSLog(@"接收到内存警告");

}

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (IBAction)btnClick {

// 单例对象

UIApplication *app1 = [UIApplication sharedApplication];

// NSLog(@"%@", app1);

UIApplication *app2 = [UIApplication sharedApplication];

// NSLog(@"%@", app2);

// networkActivityIndicatorVisible 联网指示器

// app1.networkActivityIndicatorVisible = YES;

app1.networkActivityIndicatorVisible = !app1.isNetworkActivityIndicatorVisible;

// applicationIconBadgeNumber 应用头像上的数字

/**

// 在IOS 8.0以后, 应用必须注册用户通知,在设置数字之前

In iOS 8.0 and later, your application must register for user notifications using -[UIApplication registerUserNotificationSettings:] before being able to set the icon badge.

// SEL;

// 判断手机系统的版本

double systemVersion = [[UIDevice currentDevice].systemVersion doubleValue];

if (systemVersion >= 8.0) {

// 注册用户通知,只提醒一次

UIUserNotificationCategory *category = [[UIUserNotificationCategory alloc] init];

NSSet *set = [NSSet setWithObject:category];

UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:set];

[app1 registerUserNotificationSettings:settings];

}

app1.applicationIconBadgeNumber = 10;

app1.statusBarHidden = YES;