如何用一个按钮控制计时器的开启和关闭

Question

我想有一个按钮去获取获取陀螺仪数据，点一个按钮就开始每隔0.1秒获取一次数据，再按一次按钮就关闭这个计时器，现在我的问题是我这个计时器要怎么实现，要是写在button的selector里面每一次他都会创建一个新的计时器，无法做到关闭，但是写到viewController里面会有报错

Answer 1

首先你的定时器需要创建一个变量timer，然后看代码：- (void)btnAction:(UIButton *)sender{    static BOOL clicked = NO;    clicked = !clicked;    if (clicked)    {        _timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(getDatas) userInfo:nil repeats:YES];    }    else    {        [_timer invalidate];        _timer = nil;    }}

Answer 2

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Answer 3

    [timer invalidate];    timer = nil;