Dismissing UIAlertViews when entering background state
Solution 1
I was intrigued by Dad's answer (funny username :), and curious why it was down-voted.
So I tried it.
Here is the .m part of a subclass of UIAlertView.
Edit: (Cédric) I have added a way to catch calls to delegate methods and remove the observer then to avoid multiple registrations to the notification center.
Everything bundled in a class in this github repo: https://github.com/sdarlington/WSLViewAutoDismiss
#import "UIAlertViewAutoDismiss.h"
#import <objc/runtime.h>
@interface UIAlertViewAutoDismiss () <UIAlertViewDelegate> {
id<UIAlertViewDelegate> __unsafe_unretained privateDelegate;
}
@end
@implementation UIAlertViewAutoDismiss
- (id)initWithTitle:(NSString *)title
message:(NSString *)message
delegate:(id)delegate
cancelButtonTitle:(NSString *)cancelButtonTitle
otherButtonTitles:(NSString *)otherButtonTitles, ...
{
self = [super initWithTitle:title
message:message
delegate:self
cancelButtonTitle:cancelButtonTitle
otherButtonTitles:nil, nil];
if (self) {
va_list args;
va_start(args, otherButtonTitles);
for (NSString *anOtherButtonTitle = otherButtonTitles; anOtherButtonTitle != nil; anOtherButtonTitle = va_arg(args, NSString *)) {
[self addButtonWithTitle:anOtherButtonTitle];
}
privateDelegate = delegate;
}
return self;
}
- (void)dealloc
{
privateDelegate = nil;
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
[super dealloc];
}
- (void)setDelegate:(id)delegate
{
privateDelegate = delegate;
}
- (id)delegate
{
return privateDelegate;
}
- (void)show
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(applicationDidEnterBackground:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
[super show];
}
- (void)applicationDidEnterBackground:(NSNotification *)notification
{
[super dismissWithClickedButtonIndex:[self cancelButtonIndex] animated:NO];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
}
#pragma mark - UIAlertViewDelegate
// The code below avoids to re-implement all protocol methods to forward to the real delegate.
- (id)forwardingTargetForSelector:(SEL)aSelector
{
struct objc_method_description hasMethod = protocol_getMethodDescription(@protocol(UIAlertViewDelegate), aSelector, NO, YES);
if (hasMethod.name != NULL) {
// The method is that of the UIAlertViewDelegate.
if (aSelector == @selector(alertView:didDismissWithButtonIndex:) ||
aSelector == @selector(alertView:clickedButtonAtIndex:))
{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIApplicationDidEnterBackgroundNotification
object:nil];
}
return privateDelegate;
}
else {
return [super forwardingTargetForSelector:aSelector];
}
}
@end
It works nicely. It's great, because you can just start using it the same way that you used to use UIAlertView.
I haven't had time to test it thoroughly, but I didn't notice any side effect.
Solution 2
My call would be to add a category to UIAlertview adding the following function :
- (void) hide {
[self dismissWithClickedButtonIndex:0 animated:YES];
}
And to suscribe to UIApplicationWillResignActiveNotification
:
[[NSNotificationCenter defaultCenter] addObserver:alertView selector:@selector(hide) name:@"UIApplicationWillResignActiveNotification" object:nil];
Solution 3
A totally different approach is a recursive search.
Recursive function for your application delegate
- (void)checkViews:(NSArray *)subviews {
Class AVClass = [UIAlertView class];
Class ASClass = [UIActionSheet class];
for (UIView * subview in subviews){
if ([subview isKindOfClass:AVClass]){
[(UIAlertView *)subview dismissWithClickedButtonIndex:[(UIAlertView *)subview cancelButtonIndex] animated:NO];
} else if ([subview isKindOfClass:ASClass]){
[(UIActionSheet *)subview dismissWithClickedButtonIndex:[(UIActionSheet *)subview cancelButtonIndex] animated:NO];
} else {
[self checkViews:subview.subviews];
}
}
}
Calling it from the applicationDidEnterBackground procedure
[self checkViews:application.windows];
Solution 4
As someone mentioned in a comment: the accepted answer isn't the best/cleanest one since iOS 4.0 when we have blocks! Here's how I do it:
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Alert!" message:@"This alert will dismiss when application resigns active!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationWillResignActiveNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification* notification){
[alert dismissWithClickedButtonIndex:0 animated:NO];
}];
Solution 5
huh. Haven't tried this yet, but I wonder if it would make sense to create a subclass of UIAlertView that listens for this Notification and closes itself if so...
That'd have the "automatically" without retaining / keeping it around characteristic OP is requesting. Make sure to unregister for the notification on close (else boom!)
François P.
I'm a junior IT Engineer from Montreal, Canada who currently works as a native iPhone applications developer. I call myself a über-geek, tech enthusiast who has a deep passion for programming. I'm a devoted Mac and Open Source fan. I've contributed to a few FLOSS projects (such as Wifidog and the MIT iFIND project). Stackoverflow is part of my daily routine since november 2008 and I love learning with you guys.
Updated on March 18, 2020Comments
-
François P. over 4 years
Apple recommends dismissing any
UIAlertViews/UIActionSheets
when entering background state in iOS 4. This is to avoid any confusion on the user's part when he relaunches the application later. I wonder how I could elegantly dismiss all UIAlertViews at once, without retaining a reference to it everytime I set one up...Any idea ?