开发的过程中,肯定会用到在视图想上滑动的时候,在导航处做一些操作,比如向上滑动的时候,做个动画,出现一个搜索框,或者其他的操作,那么我们怎么来判断它的滑动方向呢?

首先我们应该知道tableview继承与UIScrollview,如下图:

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" alt="" />

那么我们可以使用他的父类的方法,代码如下:

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (scrollView.contentOffset.y > ) {
NSLog(@"向上滚动");
self.title = @"京杭大运河";
self.navigationController.navigationBarHidden = YES;
}else
{
NSLog(@"向下滚动");
self.title = @"清明上河图";
self.navigationController.navigationBarHidden = NO;
} self.oldSet = scrollView.contentOffset.y;//讲当前偏移量变成缓存位移
}
self.oldSet的话,每次记录一个偏移量,可以存储到本地,然后每次进来的时候,就可以让界面处在上一次退出的位置,也可以进行一些其他的操作,想隐藏什么,都可以在这里操作!

导航栏渐变的实现代码,其实很简单:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
CGFloat minAlphaOffset = -;//- 64;
CGFloat maxAlphaOffset = ;
CGFloat offset = scrollView.contentOffset.y;
CGFloat alpha = (offset - minAlphaOffset) / (maxAlphaOffset - minAlphaOffset);
self.nav.backgroundColor = [[UIColor whiteColor]colorWithAlphaComponent:alpha];
}

实现此代理方法即可,渐变的颜色,可以自己相应调整.

												

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