ios之摇一摇

捕捉摇一摇的动作然后执行下面的代理方法 ：

1.- (void)motionBegan:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event这是开始摇一摇的时候

2.- (void)motionEnded:(UIEventSubtype)motion withEvent:(nullable UIEvent *)event这是摇一摇结束的时候

在这两个方法里面可以自定义自己想要执行的动作：

譬如/**
 *  摇一摇结束后调用
 *
 *  @param motion motion
 *  @param event  事件
 */
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.subtype == UIEventSubtypeMotionShake) {
        if ([[NSUserDefaults standardUserDefaults] integerForKey:@"changeView"]) {
            currentCount = [[NSUserDefaults standardUserDefaults] integerForKey:@"changeView"];
        }
        if (currentCount ==4) {
            randCount = 0;
            currentCount = 0;
        }else{
            randCount = currentCount +1;
        }
        NSString *str = [NSString stringWithFormat:@"%ld",(long)randCount];
        [[NSNotificationCenter defaultCenter] postNotificationName:@"changeView" object:nil userInfo:@{@"CV":str}];
    }
}