这两天看到一篇文章iOS 关于navigationBar的一些..中的动态缩放比较有意思,看了一下源码,然后用Swift写了一下,使用storyboard实现.
效果图:
部分代码:
设置滑动代理
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | /** 设置滑动代理 - parameter scrollView: scrollView description */ override func scrollViewDidScroll(scrollView: UIScrollView) { let offsetY = scrollView.contentOffset.y + tableView.contentInset.top if offsetY < 0 && offsetY >= -150 { topImageView.transform = CGAffineTransformMakeScale(1 + offsetY/0), 1 + offsetY/(-300)) } else if (offsetY >= 0 && offsetY <= 165) { topImageView.transform = CGAffineTransformMakeScale(1 - offsetY/300, 1 fsetY/300); } else if (offsetY > 165) { topImageView.transform = CGAffineTransformMakeScale(0.45, 0.45); } else if (offsetY < -150) { topImageView.transform = CGAffineTransformMakeScale(1.5, 1.5); } var frame = topImageView.frame; frame.origin.y = 5; topImageView.frame = frame; } |
ps: 来自文章中的代码
设置topImageView
1 2 3 4 5 6 7 8 9 10 11 12 13 | override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
topBkView.backgroundColor = UIColor.clearColor()
self.navigationItem.titleView = topBkView
// 设置topImageView 圆型
topImageView.layer.cornerRadius = topImageView.bounds.size.width / 2
topImageView.layer.masksToBounds = true
topImageView.layer.anchorPoint = CGPointMake(0.5, 0.5)
}
|
下载demo了解更多(很简单)
GitHub: NavTopImage
