判断手势事件向左还是向右

首先在view上添加手势 UIPanGestureRecognizer

1 UIPanGestureRecognizer *panGes = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(goAnimation:)];
2 
3  [self.view addGestureRecognizer:panGes];

在滑动方法当中根据 translationInView 这个方法返回的点的正负来判断向左还是向右大于0说明向左，小于0说明向右

UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)sender;
CGPoint point = [pan translationInView:self.view];
if (point.x>0) {
    //向左滑动
}else{
    //向右滑动
}