修改scrollview，防止其上下滾動

self.scrollView.frame=CGRectMake(0, 0, self.view.frame.size.width, self.view.bounds.size.height);
self.scrollView.pagingEnabled = YES;
self.scrollView.autoresizesSubviews = NO;
self.scrollView.bounces = NO;
self.scrollView.contentSize = CGSizeMake(self.view.frame.size.width * imageNameArray.count, self.scrollView.contentSize.height - self.scrollView.frame.size.height);