IOS8 and above Uialertview

Before iOS8, we are accustomed to use Uialertview to do cue box, IOS8 later, Apple advocates the use of Uialertcontroller instead of Uialertview.

#define System_version [[Uidevice currentdevice].systemversion Floatvalue]

if  (system_version >= 8.0)  {                     uialertcontroller *alertctrl =  [uialertcontroller alertcontrollerwithtitle:@ "Redemption Success"  message:nil preferredstyle: uialertcontrollerstylealert];                     UIAlertAction *okAction = [UIAlertAction  actionwithtitle:@ "OK"  style:uialertactionstyledefault handler:^ (uialertaction *action)  {                          [self.navigationController popViewControllerAnimated:YES];                      }];                     [alertctrl addaction:o kaction];                     [self presentViewController:alertCtrl animated:YES completion:nil];                                      } else{                // This else must be written, otherwise it will lead to the iOS8 of the real machine crash                     UIAlertView *alert = [[UIAlertView alloc]  initwithtitle:@ "Redemption Success"  message:nil delegate:self cancelbuttontitle:nil otherbuttontitles:@ " Ok ",  NIL];   &NBsp;                alert.tag  = 998;                     [alert show];                 }

#pragma mark-uialertviewdelegate-(void) Alertview: (Uialertview *) Alertview Clickedbuttonatindex: (Nsinteger)    buttonindex{if (Alertview.tag = = 998) {[Self.navigationcontroller popviewcontrolleranimated:yes]; }}

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IOS8 and above Uialertview