##发现问题 升级Xcode 9 + iOS 11后,发现本来没问题的collectionView和tableView像是中了风同样,头部刷新UI出现了错乱。 查阅发现 iOS11弃用了automaticallyAdjustsScrollViewInsets
属性,新增contentInsetAdjustmentBehavior
来替代它git
关于 contentInsetAdjustmentBehavior
github
@available(iOS 11.0, *)
public enum UIScrollViewContentInsetAdjustmentBehavior : Int {
case automatic // Similar to .scrollableAxes, but will also adjust the top & bottom contentInset when the scroll view is owned by a view controller with automaticallyAdjustsScrollViewContentInset = YES inside a navigation controller, regardless of whether the scroll view is scrollable
case scrollableAxes // Edges for scrollable axes are adjusted (i.e., contentSize.width/height > frame.size.width/height or alwaysBounceHorizontal/Vertical = YES)
case never // contentInset is not adjusted
case always // contentInset is always adjusted by the scroll view's safeAreaInsets } 复制代码
UIScrollViewContentInsetAdjustmentBehavior 是一个枚举类型,值有如下几种:swift
-automatic
和scrollableAxes同样,scrollView会自动计算和适应顶部和底部的内边距而且在scrollView 不可滚动时,也会设置内边距. -scrollableAxes
自动计算内边距. -never
不计算内边距 -always
根据safeAreaInsets 计算内边距bash
很显然,咱们这里要设置为 never
app
##开始适配 ####OC 中less
if (@available(iOS 11.0, *)){
_tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
_tableView.contentInset = UIEdgeInsetsMake(0, 0, 49, 0);//导航栏若是使用系统原生半透明的,top设置为64
_tableView.scrollIndicatorInsets = _tableView.contentInset;
}
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####swift 中ide
if #available(iOS 11.0, *) {
tableView.contentInsetAdjustmentBehavior = .never
tableView.contentInset = UIEdgeInsetsMake(0, 0, 49, 0)//导航栏若是使用系统原生半透明的,top设置为64
tableView.scrollIndicatorInsets = tableView.contentInset
}
复制代码
凡是Scrollview 及 Scrollview子类都会有适配问题,整个工程使用了无数Scrollview的你心理阴影面积必定不小,别担忧,其实能够一行代码解决问题:ui
// AppDelegate 进行全局设置
if (@available(iOS 11.0, *)){
[[UIScrollView appearance] setContentInsetAdjustmentBehavior:UIScrollViewContentInsetAdjustmentNever];
}
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####终于又回归原来的效果啦spa
更多代码可参考 https://github.com/XuYang8026/UniversalProjectcode
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