How I can display an alert when I Received memory warning. Level=2 in iphone sdk

问题

In my application the user can add any number of images to the view. If he tries to add more images of bigger in memory size the application receives memory warning . So I want to display an alert to don't add images after receiving memory warning level = 2. Is it possible If so please help me. Thank You

回答1:

For User Experience sake, don't display an alert. Handling memory is your responsibility and not that of your user.

回答2:

What kind of alert do you want to dislplay? you could make an NSAlert like so:

[NSAlert alertWithError:@""];

EDIT

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    [NSAlert alertWithError:@"You cannot make any more pictures"];
    canTakePicture = NO;
}

Create an instance variable called canTakePicture of type BOOL. When making a picture you should check if "canTakePicture" is YES or NO.

回答3:

In the didReceiveMemoryWarning write alertView.

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.}

回答4:

Your view controller method didReceiveMemoryWarning is called when application runs out of memory. Here you can create a alertview and display the appropriate message.

In general handle the warning here.

来源：https://stackoverflow.com/questions/6425043/how-i-can-display-an-alert-when-i-received-memory-warning-level-2-in-iphone-sdk