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IOS NSTimer 定时器

IOS NSTimer 定时器

作者: 丶绅士丿丨丨 | 来源:发表于2015-10-08 15:55 被阅读570次

    NSTimer 的初始化

    初始化方法:有五种初始化方法

    • (NSTimer *)timerWithTimeInterval:(NSTimeInterval)ti invocation:(NSInvocation *)invocation repeats:(BOOL)yesOrNo;
      //例如:
      //初始化一个Invocation对象
      NSInvocation * invo = [NSInvocation invocationWithMethodSignature:[[self class] instanceMethodSignatureForSelector:@selector(init)]];
      [invo setTarget:self];
      [invo setSelector:@selector(timerAction)];
      NSTimer * timer = [NSTimer timerWithTimeInterval:1 invocation:invo repeats:YES];
      //加入主循环池中
      [[NSRunLoop mainRunLoop]addTimer:timer forMode:NSDefaultRunLoopMode];
      //开始循环
      [timer fire];
    • (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti invocation:(NSInvocation *)invocation repeats:(BOOL)yesOrNo;
      //例如:
      NSTimer * timer = [NSTimer scheduledTimerWithTimeInterval:1 invocation:invo repeats:YES];
    • (NSTimer *)timerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;
      //例如:
      NSTimer * timer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(timerAction) userInfo:nil repeats:NO];
    • (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;
      //例如:
      NSTimer * timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timerAction:) userInfo:@"123" repeats:YES];
    • (instancetype)initWithFireDate:(NSDate *)date interval:(NSTimeInterval)ti target:(id)t selector:(SEL)s userInfo:(id)ui repeats:(BOOL)repeats:(BOOL)yesOrNo;
      //例如:
      NSTimer * timer = [[NSTimer alloc]initWithFireDate:[NSDate distantPast] interval:1 target:self selector:@selector(timerAction:) userInfo:nil repeats:YES];
      [[NSRunLoop mainRunLoop]addTimer:timer forMode:NSDefaultRunLoopMode];

    它的属性

    @property (copy) NSDate *fireDate;//这是设置定时器的启动时间,常用来管理定时器的启动与停止

    //启动定时器
    timer.fireDate = [NSDate distantPast];
    //停止定时器
    timer.fireDate = [NSDate distantFuture];
    

    @property (readonly) NSTimeInterval timeInterval;//这个是一个只读属性,获取定时器调用间隔时间

    @property NSTimeInterval tolerance;//这是7.0之后新增的一个属性,因为NSTimer并不完全精准,通过这个值设置误差范围

    @property (readonly, getter=isValid) BOOL valid;//获取定时器是否有效

    @property (readonly, retain) id userInfo;//获取参数信息

    释放,销毁定时器

    [timer invalidate];//是唯一的方法将定时器从循环池中移除

    timer=nil;//同时置空

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