IOS系列——NStimer

Timer经常使用的一些东西

1. 初始化  

 timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeTime:) userInfo:nil <span style="font-family: Arial, Helvetica, sans-serif;"> repeats:YES];</span>

2.timer 立即运行

[tiemr fire];

3. timer 失效

[timer invalidate];<pre name="code" class="html">timer = nil;    //timer失效的时候 ，最好要置空

4.timer 暂停

[timer setFireDate:[NSDate distantFuture]]；

5.timer 暂停之后又一次開始

[timer setFireDate:[NSDate distantPast]];

6.timer 方法传參

传递的參数是一个id类型，我们一般吧全部的传递參数都放到NSdictionary里面去

    NSDictionary *dic = [NSDictionary dictionaryWithObject:[NSString stringWithFormat:@"%i",animIndexPath] forKey:@"animIndexPath"];
    timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeTime:) userInfo:dic repeats:YES];

-(void)changeTime:(NSTimer *)tme{
    
    int soundLength = [[[tme userInfo] objectForKey:@"animIndexPath"] intValue];
    }
}

7.推断timer是否在执行

if ([timer isValid]) {
        [timer invalidate];
        timer = nil;
    }