CustomTextViewMenu

EBCustomTextView.h

//
//  EBCustomTextView.h
//  TestProject
//
//  Created by Erid Bardhaj on 3/8/16.
//  Copyright © 2016 Erid Bardhaj. All rights reserved.
//

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSInteger, EBCustomTextViewMenuAction) {
    EBCustomTextViewMenuActionCopy,
    EBCustomTextViewMenuActionDefine,
    EBCustomTextViewMenuActionRead
};

@class EBCustomTextView;
@protocol EBCustomTextViewMenuActionDelegate <NSObject>

- (void)customTextView:(EBCustomTextView *)textView didSelectMenuAction:(EBCustomTextViewMenuAction)action;

@end

@interface EBCustomTextView : UITextView

@property (weak, nonatomic) id<EBCustomTextViewMenuActionDelegate> menuActionDelegate;

@end

EBCustomTextView.m

//
//  EBCustomTextView.m
//  TestProject
//
//  Created by Erid Bardhaj on 3/8/16.
//  Copyright © 2016 Erid Bardhaj. All rights reserved.
//

#import "EBCustomTextView.h"

@implementation EBCustomTextView {
    EBCustomTextViewMenuAction currentAction;
}

- (void)awakeFromNib {
    [super awakeFromNib];
    
    // Configure the textView
    self.editable = NO;
    self.selectable = NO;
}

#pragma mark - Datasource

- (NSArray *)items {
    UIMenuItem *item = [[UIMenuItem alloc] initWithTitle:@"Copy" action:NSSelectorFromString(@"menuitem_0")];
    UIMenuItem *item1 = [[UIMenuItem alloc] initWithTitle:@"Define" action:NSSelectorFromString(@"menuitem_1")];
    UIMenuItem *item2 = [[UIMenuItem alloc] initWithTitle:@"Read" action:NSSelectorFromString(@"menuitem_2")];
    
    return @[item, item1, item2];
}


#pragma mark - Actions

- (void)copyMenuItemPressed {
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:EBCustomTextViewMenuActionCopy];
    }
}

- (void)defineMenuItemPressed {
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:EBCustomTextViewMenuActionDefine];
    }
}

- (void)readMenuItemPressed {
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:EBCustomTextViewMenuActionRead];
    }
}

#pragma mark - Private

- (void)menuItemPressedAtIndex:(NSInteger)index {
    currentAction = index;
    
    if ([self.menuActionDelegate respondsToSelector:@selector(customTextView:didSelectMenuAction:)]) {
        [self.menuActionDelegate customTextView:self didSelectMenuAction:currentAction];
    }
}

#pragma mark Helpers

- (void)showMenuController {
    UIMenuController *theMenu = [UIMenuController sharedMenuController];
    theMenu.menuItems = [self items];
    [theMenu update];
    
    CGRect selectionRect = CGRectMake (0, 0, self.contentSize.width, self.contentSize.height);
    [theMenu setTargetRect:selectionRect inView:self];
    [theMenu setMenuVisible:(theMenu.isMenuVisible) ? NO : YES animated:YES];
}

#pragma mark Handling messages

// Credit to http://stackoverflow.com/a/9874092/2664437
- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel {
    if ([super methodSignatureForSelector:sel]) {
        return [super methodSignatureForSelector:sel];
    }
    return [super methodSignatureForSelector:@selector(menuItemPressedAtIndex:)];
}

- (void)forwardInvocation:(NSInvocation *)invocation {
    NSString *sel = NSStringFromSelector([invocation selector]);
    NSRange match = [sel rangeOfString:@"menuitem_"];
    if (match.location == 0) {
        [self menuItemPressedAtIndex:[[sel substringFromIndex:9] integerValue]];
    } else {
        [super forwardInvocation:invocation];
    }
}

#pragma mark - Overridings

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    NSString *sel = NSStringFromSelector(action);
    NSRange match = [sel rangeOfString:@"menuitem_"];
    
    // Keep only our selectors
    if (match.location == 0) {
        return YES;
    }
    return NO;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *theTouch = [touches anyObject];
    
    if ([theTouch tapCount] == 1  && [self becomeFirstResponder]) {
        [self showMenuController];
    }
}


@end