IOS开发之定时器

2019独角兽企业重金招聘Python工程师标准>>>

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

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

    // Override point for customization after application launch.

   

     _window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

    

    [_window setBackgroundColor:[UIColor whiteColor]];

    

    //==============NSTimer定时器================

    //1.定时器的创建

    //参数1:时间间隔(定时的时间)单位:秒

    //参数2:相应消息的对象(调用方法的对象)

    //参数3:消息(方法)，可以带参数，

    //但是只能带一个参数，而且参数的实参就是当前这个定时器对象本身

    

    //参数4:需要传入到定时器中的对象;

    //参数5:是否重复;如果repeats是YES那么每隔一秒调用一次time方法;

    

    //间隔1秒时间后，self调用time方法

    //定时器一创建就开启了;

   NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.1

                                                     target:self selector:@selector(time:) userInfo:@"fanjuan" repeats:YES] ;

    

   // NSLog(@"%p",timer);

    

    //2.关闭一个定时器

    [timer setFireDate:[NSDate distantFuture]];

    

    //3.开启定时器

  //  [timer setFireDate:[NSDate distantPast]];

    

    [_window makeKeyAndVisible];

    

    

    

    

    return YES;

}

- (void) time:(NSTimer *)timer{

    

    NSLog(@"%@",timer.userInfo);

   // NSLog(@"定时器：%p",timer);

}

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

    // 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 {

    // 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 {

    // 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 {

    // 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 {

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

}

@end

转载于:https://my.oschina.net/luhoney/blog/653875