Blocks over delegates

GABlockDelegate.h

//
//  GABlockDelegate.h
//  GAToolkit
//
//  Created by Geoff on 12/29/2013.
//  Copyright (c) 2013 Geoff. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface GABlockDelegate : NSObject <UIAlertViewDelegate, UIActionSheetDelegate>

// UIControl
+ (void)addBlock:(void (^)(id object))block toUIControl:(UIControl *)control;
+ (void)addBlock:(void (^)(id object))block toUIControl:(UIControl *)control forControlEvents:(UIControlEvents)controlEvent;
+ (void)removeBlockFromUIControl:(UIControl *)control;

// UIAlertView
+ (void)showAlertViewWithTitle:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle otherTitles:(NSArray *)otherTitles responseHandler:(void (^)(UIAlertView *alertView, NSString *string))block;
+ (void)showAlertView:(UIAlertView *)alertView withResponseHandler:(void (^)(UIAlertView *alertView, NSString *buttonTitle))block;
+ (void)setAlertView:(UIAlertView *)alertView withResponseHandler:(void (^)(UIAlertView *alertView, NSString *buttonTitle))block;

// UIActionSheet
+ (UIActionSheet *)createActionSheetWithTitle:(NSString *)title cancelTitle:(NSString *)cancelTitle destructiveTitle:(NSString *)destructiveTitle otherTitles:(NSArray *)otherTitles withResponseHandler:(void (^)(UIActionSheet *actionSheet, NSString *buttonTitle))block;
+ (void)setActionSheet:(UIActionSheet *)actionSheet withResponseHandler:(void (^)(UIActionSheet *actionSheet, NSString *buttonTitle))block;

// Gesture
+ (void)setGestureRecognizer:(UIGestureRecognizer *)gesture withResponseHandler:(void (^)(UIGestureRecognizer *gestureRecognizer, UIGestureRecognizerState state))block;
+ (void)removeGestureRecognizer:(UIGestureRecognizer *)gesture;

@end

GABlockDelegate.m

//
//  GABlockDelegate.m
//  GAToolkit
//
//  Created by Geoff on 12/29/2013.
//  Copyright (c) 2013 Geoff. All rights reserved.
//

#import "GABlockDelegate.h"

#import <objc/runtime.h>

static char controlEventsKey;
static char alertViewKey;
static char actionSheetKey;
static char gestureKey;

@implementation GABlockDelegate

#pragma mark -
#pragma mark UIControl

+ (void)addBlock:(void (^)(id))block toUIControl:(UIControl *)control {
	UIControlEvents controlEvent = UIControlEventTouchUpInside;
	if ( [control conformsToProtocol:@protocol(UITextInput)] ) {
		controlEvent = UIControlEventValueChanged;
	}
	else if ( [control isKindOfClass:[UISlider class]] ) {
		controlEvent = UIControlEventValueChanged;
	}
	else if ( [control isKindOfClass:[UIStepper class]] ) {
		controlEvent = UIControlEventValueChanged;
	}
	else if ( [control isKindOfClass:[UIDatePicker class]] ) {
		controlEvent = UIControlEventValueChanged;
	}
	else if ( [control isKindOfClass:[UIPickerView class]] ) {
		controlEvent = UIControlEventValueChanged;
	}
	[self addBlock:block toUIControl:control forControlEvents:controlEvent];
}

+ (void)addBlock:(void (^)(id))block toUIControl:(UIControl *)control forControlEvents:(UIControlEvents)controlEvent {
	objc_setAssociatedObject(control, &controlEventsKey, block, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
	[control addTarget:self action:@selector(respondToUIControl:) forControlEvents:controlEvent];
}

+ (void)removeBlockFromUIControl:(UIControl *)control {
	objc_removeAssociatedObjects(control);
}

+ (void)respondToUIControl:(UIControl *)control {
	void (^block)(id) = objc_getAssociatedObject(control, &controlEventsKey);
	block(control);
}

#pragma mark -
#pragma mark UIAlertView

+ (void)showAlertViewWithTitle:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle otherTitles:(NSArray *)otherTitles responseHandler:(void (^)(UIAlertView *, NSString *))block {
	UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title message:message delegate:self cancelButtonTitle:nil otherButtonTitles:Nil];
	for ( NSString *title in otherTitles ) {
		[alertView addButtonWithTitle:title];
	}
	
	if ( cancelTitle ) {
		alertView.cancelButtonIndex = [alertView addButtonWithTitle:cancelTitle];
	}
	
	[self showAlertView:alertView withResponseHandler:block];
}

+ (void)showAlertView:(UIAlertView *)alertView withResponseHandler:(void (^)(UIAlertView *, NSString *))block {
	[self setAlertView:alertView withResponseHandler:block];
	[alertView show];
}

+ (void)setAlertView:(UIAlertView *)alertView withResponseHandler:(void (^)(UIAlertView *, NSString *))block {
	alertView.delegate = self;
	objc_setAssociatedObject(alertView, &alertViewKey, block, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

+ (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
	void (^block)(UIAlertView *, NSString *) = objc_getAssociatedObject(alertView, &alertViewKey);
	block(alertView,[alertView buttonTitleAtIndex:buttonIndex]);
}

+ (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	objc_removeAssociatedObjects(alertView);
}

#pragma mark -
#pragma mark UIActionSheet

+ (UIActionSheet *)createActionSheetWithTitle:(NSString *)title cancelTitle:(NSString *)cancelTitle destructiveTitle:(NSString *)destructiveTitle otherTitles:(NSArray *)otherTitles withResponseHandler:(void (^)(UIActionSheet *, NSString *))block {
	UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:title delegate:(id <UIActionSheetDelegate>)self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
	for ( NSString *title in otherTitles ) {
		[actionSheet addButtonWithTitle:title];
	}
	
	if ( cancelTitle ) {
		actionSheet.cancelButtonIndex = [actionSheet addButtonWithTitle:cancelTitle];
	}
	if ( destructiveTitle ) {
		actionSheet.destructiveButtonIndex = [actionSheet addButtonWithTitle:destructiveTitle];
	}
	
	[self setActionSheet:actionSheet withResponseHandler:block];
	return actionSheet;
}

+ (void)setActionSheet:(UIActionSheet *)actionSheet withResponseHandler:(void (^)(UIActionSheet *, NSString *))block {
	actionSheet.delegate = (id <UIActionSheetDelegate>)self;
	objc_setAssociatedObject(actionSheet, &actionSheetKey, block, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

+ (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
	void (^block)(UIActionSheet *, NSString *) = objc_getAssociatedObject(actionSheet, &actionSheetKey);
	block(actionSheet,[actionSheet buttonTitleAtIndex:buttonIndex]);
}

+ (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
	objc_removeAssociatedObjects(actionSheet);
}

#pragma mark -
#pragma mark Gestures

+ (void)setGestureRecognizer:(UIGestureRecognizer *)gesture withResponseHandler:(void (^)(UIGestureRecognizer *, UIGestureRecognizerState))block {
	objc_setAssociatedObject(gesture, &gestureKey, block, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
	[gesture addTarget:self action:@selector(handleGesture:)];
}

+ (void)handleGesture:(UIGestureRecognizer *)gesture {
	void (^block)(UIGestureRecognizer *, UIGestureRecognizerState) = objc_getAssociatedObject(gesture, &gestureKey);
	block(gesture, gesture.state);
}

+ (void)removeGestureRecognizer:(UIGestureRecognizer *)gesture {
	objc_removeAssociatedObjects(gesture);
}

@end