viewDidUnload and didReceiveMemoryWarning Compatibility

Question

viewDidUnload is not allowed at ios6,so how to Compatibility viewDidUnload and didReceiveMemoryWarning to call. i need

- (void)viewDidUnload{

self.listArr=nil;

[super viewDidUnload];
}  




 - (void)didReceiveMemoryWarning
{

[super didReceiveMemoryWarning];
float sysVer =[[[UIDevice currentDevice] systemVersion] floatValue];
if (sysVer>= 6.0f){
    if([self isViewLoaded] && !self.view.window){
        self.listArr=nil;

        self.view = nil;
    }
}

 NSLog(@" BrowseComment didReceiveMemoryWarning");

}

or only use the follow code at ios5 and ios6

- (void)didReceiveMemoryWarning
{

[super didReceiveMemoryWarning];

    if([self isViewLoaded] && !self.view.window){
        self.listArr=nil;

        self.view = nil;
    }


 NSLog(@" BrowseComment didReceiveMemoryWarning");

}

Please refer to this [http://stackoverflow.com/questions/12674268/ios-6-viewdidunload-migrate-to-didreceivememorywarning][1] [1]: http://stackoverflow.com/questions/12674268/ios-6-viewdidunload-migrate-to-didreceivememorywarning — Mark Kryzhanouski, Feb 19 '13 at 11:44

Anil Varghese · Accepted Answer · 2013-02-19T11:50:14.683

In iOS 6, the viewWillUnload and viewDidUnload methods of UIViewController are now deprecated. If you were using these methods to release data, use the didReceiveMemoryWarning method instead. You can also use this method to release references to the view controller’s view if it is not being used.

The codes currently using in viewDidUnload should be moved into didReceiveMemoryWarning. It will work on both iOS5 & iOS6 also. Actually before this change happens the viewDidUnload method is get invoked only when application did receive memory warning. So viewDidUnload does not have any particular significance. So they deprecate it.

how to release data at ios5 and ios6 – pengwang Feb 19 '13 at 11:43 — pengwang, Feb 19 '13 at 11:43

score 0 · Answer 2 · answered Feb 19 '13 at 11:43

0

From iOS 6 onwards the viewDidUnload and viewWillUnload have no role.

So if you need to handle the memory warnings, do it in the didReceiveMemoryWarning

answered Feb 19 '13 at 11:43

Midhun MP

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if using ios5,can i do it in the didReceiveMemoryWarning – pengwang Feb 19 '13 at 11:49
@pengwang: sure you can definitely do it there in iOS 5. – Midhun MP Feb 19 '13 at 14:14

viewDidUnload and didReceiveMemoryWarning Compatibility

2 Answers2