I looked around, but couldn\'t find this on the internet, nor anywhere in the Apple docs, so I\'m guessing it doesn\'t exist.
But is there a iOS4 blocks equivalent A
There is a library of blocks additions to the common Foundation/UI classes: BlocksKit. Here is the documentation.
It does not subclass UIButton, but adds UIControl category:
[button addEventHandler:^(id sender) {
//do something
} forControlEvents:UIControlEventTouchUpInside];
There is also blocks/functional additions to collections (map, filter, etc), views-related stuff and more.
NOTE: it does not play well with Swift.