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NSApplication+ESSApplicationCategory for OS X ReadMe

What is NSApplication+ESSApplicationCategory?

A collection of possibly useful methods and functions.

Currently consisting of:

void ESSBeginAlertSheet(...)  
void ESSBeginInformationalAlertSheet(...)  
void ESSBeginCriticalAlertSheet(...)  

These three functions are basically the same as their NSBegin*AlertSheet(...) counterparts, only that they use blocks for callbacks, not @selectors.

You might notice that the NSBegin*AlertSheet functions are declared in the header of the NSPanel class. But since ESSBegin*AlertSheet builds on NSBegin*AlertSheet, it still uses the @selector callbacks to do its stuff which needs an instance of a class, and NSApplication is the perfect place for that, since any Cocoa app has an instance of it.

First, the License Agreement

  1. You can use the code in your own products.
  2. You can modify the code as you wish, and use the modified code in your products.
  3. You can redistribute the original, unmodified code, but you have to include the full license text below.
  4. You can redistribute the modified code as you wish (without the full license text below).
  5. In all cases, you must include a credit mentioning Matthias Gansrigler as the original author of the source.
  6. I’m not liable for anything you do with the code, no matter what. So be sensible.
  7. You can’t use my name or other marks to promote your products based on the code.
  8. If you agree to all of that, go ahead and download the source. Otherwise, don’t.

How To use NSApplication+ESSApplicationCategory

Just #import "NSApplication+ESSApplicationCategory.h" in your project and start using it :)

Note on the NSString *formattedString argument - unlike the NSBegin*AlertSheet function, ESSBegin*AlertSheet function does not format the string for you, so instead of passing a string like @"This operation took %ld minutes", please pass a string that already is formatted, as in [NSString stringWithFormat:@"This operation took %ld minutes",5].

###Example Usage

^(void *context, NSInteger returnCode){
	NSLog(@"didEnd: %@, code: %ld",context,returnCode);
^(void *context, NSInteger returnCode){
	NSLog(@"did dismiss: %@, code: %ld",context,returnCode);
[NSDictionary dictionaryWithObject:@"Some context info" forKey:@"in a dictionary"],
[NSString stringWithFormat:@"Our message: %ld",5]);


This code works on OS X Snow Leopard and later (tested only on OS X Mountain Lion)
Developed with Xcode 4.5


The code is provided as-is, but if you need help or have suggestions, you can contact me anytime at or @eternalstorms on twitter

For other Open Source projects of mine, please visit

I want to hear from you

If you use NSApplication+ESSApplicationCategory in one of your projects, please let me know! I'd love to hear about your apps and mention them here on this project page :) !!


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