ios - 系统版本判断

if (@available(iOS 10.0, *)) {
       self.view.backgroundColor = [UIColor colorWithDisplayP3Red:255.0/255 green:105.0/255 blue:180.0/255 alpha:1.0];
   } else {
       // Fallback on earlier versions
   }

或者直接获取手机的系统版本号作为判断

+(double)systemVersion{
    NSString *version = [UIDevice currentDevice].systemVersion;
    return version.doubleValue;
}