iOS 适配iPhone X的方法
因为iPhoneX奇特的刘海存在，iOS11之后系统深化了“安全区域”概念，安全区域就是从屏幕上切除最大的矩形之外的区域。
iOS11后UIScrollView新增contentInsetAdjustmentBehavior属性，默认配置UIScrollViewContentInsetAdjustmentAutomatic，效果上就是没使用安全区域。若针对具体页面需要使用安全区域，可以查看API中新增加的那些属性。
/**
*适配iPhoneX的安全区域
*isUse=1表示使用安全区域
*isUse=0表示不使用安全区域
*/
+(void)adaptationSafeAreaWith:(UIScrollView*)svuseArea:(NSInteger)isUse{
if([[svclass]isSubclassOfClass:[UIWebViewclass]]){
UIWebView*webView=(UIWebView*)sv;
for(UIView*aViewin[webViewsubviews]){
if([aViewisKindOfClass:[UIScrollViewclass]]){
sv=(UIScrollView*)aView;
break;
}
}
}
#ifdef__IPHONE_11_0
if([svrespondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]){
if(isUse){
if(@available(iOS11.0,*)){
sv.contentInsetAdjustmentBehavior=UIScrollViewContentInsetAdjustmentNever;
if([[svclass]isSubclassOfClass:[UITableViewclass]]){
UITableView*tv=(UITableView*)sv;
[tvsetInsetsContentViewsToSafeArea:NO];
}
}else{
//Fallbackonearlierversions
}
}else{
if(@available(iOS11.0,*)){
sv.contentInsetAdjustmentBehavior=UIScrollViewContentInsetAdjustmentAlways;
}else{
//Fallbackonearlierversions
}
}
}
#endif
}
typedefNS_ENUM(NSInteger,UIScrollViewContentInsetAdjustmentBehavior){
UIScrollViewContentInsetAdjustmentAutomatic,//Similarto.scrollableAxes,butforbackwardcompatibilitywillalsoadjustthetop&bottomcontentInsetwhenthescrollviewisownedbyaviewcontrollerwithautomaticallyAdjustsScrollViewInsets=YESinsideanavigationcontroller,regardlessofwhetherthescrollviewisscrollable
UIScrollViewContentInsetAdjustmentScrollableAxes,//Edgesforscrollableaxesareadjusted(i.e.,contentSize.width/height>frame.size.width/heightoralwaysBounceHorizontal/Vertical=YES)
UIScrollViewContentInsetAdjustmentNever,//contentInsetisnotadjusted
UIScrollViewContentInsetAdjustmentAlways,//contentInsetisalwaysadjustedbythescrollview'ssafeAreaInsets
}API_AVAILABLE(ios(11.0),tvos(11.0));
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