λ-alert

This repo contains two simple wrappers around UIAlertView and UIActionSheet that allow you to use blocks for actions, so that you don’t have to mess with delegate callbacks and button indexes. Please note that since iOS 8 you should use the official UIAlertController instead.

Installing

This project includes a podspec for usage with CocoaPods. Simply add

pod 'Lambda-Alert'

to your Podfile and run pod install.

Alternately, you can add all of the files contained in this project's Library directory to your Xcode project. If your project does not use ARC, you will need to enable ARC on these files. You can enable ARC per-file by adding the -fobjc-arc flag, as described on a common StackOverflow question.

Finally, you could clone the whole repository and drag the project to an Xcode workspace. Then you can add libLambdaAlert to the list of linked libraries for your target and start using the code.

Usage

Displaying an alert:

CCAlertView *alert = [[CCAlertView alloc]
    initWithTitle:@"Test Alert"
    message:@"See if the thing works."];
[alert addButtonWithTitle:@"Foo" block:^{ NSLog(@"Foo"); }];
[alert addButtonWithTitle:@"Bar" block:^{ NSLog(@"Bar"); }];
[alert addButtonWithTitle:@"Cancel" block:NULL];
[alert show];

Displaying a sheet:

CCActionSheet *sheet = [[CCActionSheet alloc] initWithTitle:@"Action Sheet"];
[sheet addButtonWithTitle:@"Miles" block:^{ NSLog(@"Trumpet"); }];
[sheet addButtonWithTitle:@"Trane" block:^{ NSLog(@"Saxophone"); }];
[sheet addDestructiveButtonWithTitle:@"Monk" block:^{ NSLog(@"Piano"); }];
[sheet addCancelButtonWithTitle:@"Back to the Head"];
[sheet showInView:window];

The alert will keep itself from being deallocated until closed.

Extra features

• Both classes feature a dismissAction block that will be called when the dialog is dismissed, be it with a button tap, cancelling or dismissing through the -dismissAnimated: method.
• Both classes have a -dismissAnimated: method that will dismiss the dialog without pressing any of the buttons. This method does not perform the cancel button action, but it does call the dismissAction block mentioned in the previous bullet.
• You can also dismiss the dialog by posting a notification to the standard notification center. The name of the notification is documented in the header files. If you want the dismissal to be animated, include a userInfo dictionary with the notification that returns an appropriate NSNumber instance for CCActionSheetAnimatedKey or CCAlertViewAnimatedKey. The notification triggers -dismissAnimated:, so the notes above apply.

Links

• Programming with C Blocks by Joachim Bengtsson
• Practical Blocks by Mike Ash

Author & License

Licensed under the terms of the MIT License:

Copyright © Tomáš Znamenáček, tomas.znamenacek@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

The software is provided “as is”, without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the Software or the use or other dealings in the Software.