Objective-C In-line block declaration can be hard to remember. Here are example declaration and usage.

iOS - In-line block declaration.m

// using block in interface property, use "copy"
@property (copy, nonatomic) void (^simpleBlock)(void);
@property (copy, nonatomic) BOOL (^blockWithParamter)(NSString *input);

// block variable declaration
void (^addButton)(SEL, NSString *) = ^(SEL action, NSString *imageName) {
};

// block typedef shorthand
typedef BOOL (^FailureHandler)(NSError *error);

// method that returns a block
+ (BOOL(^)(NSError *error))validationBlock;
+ (FailureHandler)validationBlock;

// using block in method declaration
- (BOOL)connectWithCompletion:(void (^)(BOOL success))block;

// --- Examples ---

// This is a copy-paste job with a few changes, so you could use a define, 
// but it is getting a little complex. Instead, try using a block.
// credit: http://stablekernel.com/blog/define-vs-const-vs-the-world/

// set up buttons with each origin.y 60 away from each other
__block CGRect r = CGRectMake(20, 20, 80, 40);
void (^addButton)(SEL, NSString *) = ^(SEL action, NSString *imageName) {
    UIButton *b = ...;
    ...
    r.origin.y += 60;
};

addButton(@selector(action1:), @"button1");
addButton(@selector(action2:), @"button2");