Category on UIAlertView to use inline block callbacks instead of delegate callbacks.
UIAlertView was created in a time before blocks, ARC, and judging by its naming – touch screens too. Who "clicks" on an alert view anyway?
Lets modernize this shizzle with some blocks goodness.
typedef void (^UIAlertViewBlock) (UIAlertView *alertView); typedef void (^UIAlertViewCompletionBlock) (UIAlertView *alertView, NSInteger buttonIndex); @property (copy, nonatomic) UIAlertViewCompletionBlock tapBlock; @property (copy, nonatomic) UIAlertViewCompletionBlock willDismissBlock; @property (copy, nonatomic) UIAlertViewCompletionBlock didDismissBlock; @property (copy, nonatomic) UIAlertViewBlock willPresentBlock; @property (copy, nonatomic) UIAlertViewBlock didPresentBlock; @property (copy, nonatomic) UIAlertViewBlock cancelBlock; @property (copy, nonatomic) BOOL(^shouldEnableFirstOtherButtonBlock)(UIAlertView *alertView);
You can create and show an alert in a single call, e.g.
[UIAlertView showWithTitle:@"Drink Selection" message:@"Choose a refreshing beverage" cancelButtonTitle:@"Cancel" otherButtonTitles:@[@"Beer", @"Wine"] tapBlock:^(UIAlertView *alertView, NSInteger buttonIndex) { if (buttonIndex == [alertView cancelButtonIndex]) { NSLog(@"Cancelled"); } else if ([[alertView buttonTitleAtIndex:buttonIndex] isEqualToString:@"Beer"]) { NSLog(@"Have a cold beer"); } else if ([[alertView buttonTitleAtIndex:buttonIndex] isEqualToString:@"Wine"]) { NSLog(@"Have a glass of chardonnay"); } }];
If you need further customization, you can create and configure an alert as you usually would, and then assign blocks to the alert, e.g.
UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Sign in to my awesome service" message:@"I promise I won’t steal your password" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil]; av.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput; av.tapBlock = ^(UIAlertView *alertView, NSInteger buttonIndex) { if (buttonIndex == alertView.firstOtherButtonIndex) { NSLog(@"Username: %@", [[alertView textFieldAtIndex:0] text]); NSLog(@"Password: %@", [[alertView textFieldAtIndex:1] text]); } else if (buttonIndex == alertView.cancelButtonIndex) { NSLog(@"Cancelled."); } }; av.shouldEnableFirstOtherButtonBlock = ^BOOL(UIAlertView *alertView) { return ([[[alertView textFieldAtIndex:1] text] length] > 0); }; [av show];
If a delegate was set on the alert view, the delegate will be preserved and the blocks will be executed before the delegate is called.
Blocks - so iOS 4.0 and later. Compatible with both ARC and traditional retain/release code. Since version 0.9 the headers use the new Objective-C nullability annotations for nicer interoperability with Swift, so you will need Xcode 6.3 or later to compile it.
The Xcode test project uses the XCTest framework and so requires >= Xcode 5.
Add UIAlertView+Blocks.h/m into your project, or pod 'UIAlertView+Blocks' using CocoaPods.
In your code, either #import <UIAlertView+Blocks/UIAlertView+Blocks.h> (Objective-C header), @import UIAlertView_Blocks; (Objective-C module), or import UIAlertView_Blocks (Swift).
If you’d like similar functionality on UIActionSheet too, check out twin-sister UIActionSheet+Blocks.
Check out UIAlertController+Blocks if you would like to migrate to UIAlertController, and use a familiar API.