[ios]ios开发之检测UIScrollView的滚动方向 【转】

来自：http://blog.csdn.net/caryaliu/article/details/7907196

int _lastPosition=0;

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

int currentPostion = scrollView.contentOffset.y;

if (currentPostion - _lastPosition > 25) {

_lastPosition = currentPostion;

NSLog(@"ScrollUp now");

}

else if (_lastPosition - currentPostion > 25)

{

_lastPosition = currentPostion;

NSLog(@"ScrollDown now");

}

}

25 可以是任意数字，可根据自己的需要来设定。