An example of block typedefs in Objective-C

Blocks.h

#ifndef Blocks_h
#define Blocks_h

#import <Foundation/Foundation.h>

typedef void (^VoidBlock)();

typedef BOOL (^ReturnBoolBlock)();

typedef void (^DictionaryBlock)(NSDictionary *dictionary);

typedef void (^TableCellIndexPathBlock)(UITableViewCell *cell,NSIndexPath *indexPath);

typedef UITableViewCell *(^ReturnTableCellForTableViewAndIndexPathBlock)(UITableView *tableView,NSIndexPath *indexPath);

#endif