我想在iPhone上隐藏两个滚动条.当我向上滚动时,他们应该再次出现..我该如何处理？
解决方法
接受的答案对我来说不起作用,因为scrollViewWillBeginScroll：不是委托方法.
相反我做
-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[[NSNotificationCenter defaultCenter] postNotificationName:@"BaRSShouldHide" object:self];
}
-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView
willDecelerate:(BOOL)decelerate
{
if(!decelerate)
[[NSNotificationCenter defaultCenter] postNotificationName:@"BaRSShouldUnhide"
object:self];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
[[NSNotificationCenter defaultCenter] postNotificationName:@"BaRSShouldUnhide"
object:self];
}
应用程序对象中的任何地方都可以收听此通知,例如
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addobserverForName:@"BaRSShouldHide"
object:nil
queue:nil
usingBlock:^(NSNotification *note) {
//hide tab bar with animation;
}];
[[NSNotificationCenter defaultCenter] addobserverForName:@"BaRSShouldUnhide"
object:nil
queue:nil
usingBlock:^(NSNotification *note) {
//Unhide tab bar with animation;
}];
}
此代码将隐藏任何滚动条.如果你想只有下来,同一个位置处理技巧在接受的答案应该工作.