Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar


Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar



I'd love to create a "back" left-arrow-bezel button in a UIToolbar.

As far as I can tell, the only way to get one of these is to leave UINavigationController at default settings and it uses one for the left bar item. But there's no way I can find to create one as a UIBarButtonItem, so I can't make one in a standard UIToolbar, even though they're very similar to UINavigationBars.

I could manually create it with button images, but I can't find the source images anywhere. They have alpha-channel edges, so screenshotting and cutting won't get very versatile results.

Any ideas beyond screenshotting for every size and color scheme I intend to use?

Update: PLEASE STOP dodging the question and suggesting that I shouldn't be asking this and should be using UINavigationBar. My app is Instapaper Pro. It shows only a bottom toolbar (to save space and maximize readable content area), and I wish to put a left-arrow-shaped Back button in the bottom.

Telling me that I shouldn't need to do this is not an answer and certainly doesn't deserve a bounty.




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1:



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I then just created a custom UIView that I use in the customView property of the toolbar item..
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Edit: As pointed out by PrairieHippo, maralbjo found that using the following, simple code did the trick (requires custom image in bundle) should be combined with this answer.


Protocols with optional properties?
So here is additional code:.
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// Creates a back button instead of default behaviour (displaying title of previous screen) UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back_arrow.png"]                                                                style:UIBarButtonItemStyleBordered                                                               target:self                                                               action:@selector(backAction)];  tipsDetailViewController.navigationItem.leftBarButtonItem = backButton; [backButton release]; 


2:


The Unicode Method

I think it is much easier to just use a unicode character to get the job done.

You can look through arrows by googling either Unicode Triangles or Unicode Arrows.

Starting with iOS6 Apple changed the character to be an emoji character with a border.

To disable the border I add the 0xFE0E Unicode Variation Selector.

.
NSString *backArrowString = @"\U000025C0\U0000FE0E"; //BLACK LEFT-POINTING TRIANGLE PLUS VARIATION SELECTOR  UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:backArrowString style:UIBarButtonItemStylePlain target:nil action:nil]; self.navigationItem.leftButtonItem = backBarButtonItem; 
The code block is just for the demo.

It would work in any button that accepts an NSString.. For a full list of characters search Google for Unicode character and what you want.

Here is the entry for Black Left-Pointing Triangle..

Result

The result.


3:


WARNING: There are reports that this will not work on iOS 6.

This might only work on older versions of the OS.

Evidently at least one dev has had their app rejected for using this trick (see the comments).

Use at your own risk.

Using an image (see answer above) might be a safer solution.. This can be done without adding in your own image files using sekr1t button type 101 to get the correct shape.

For me the trick was figuring out that I could use 'initWithCustomView' to create the Bar Button Item.

I personally needed this for a dynamic navbar rather than a toolbar, but I tested it with a toolbar and the code is nearly the same:.
// create button UIButton* backButton = [UIButton buttonWithType:101]; // left-pointing shape! [backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside]; [backButton setTitle:@"Back" forState:UIControlStateNormal];  // create button item -- possible because UIButton subclasses UIView! UIBarButtonItem* backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];  // add to toolbar, or to a navbar (you should only have one of these!) [toolbar setItems:[NSArray arrayWithObject:backItem]]; navItem.leftBarButtonItem = backItem; 
If you're doing this on a toolbar you'll have to tweak how you set the items, but that depends on the rest of your code and I leave that as an exercise for the reader.

:P This sample worked for me (compiled & run).. Blah blah, read the HIG, don't use undocumented features, and all that.

There's only six supported button types and this isn't one of them..


4:


enter image description here. First of all you have to find an image of the back button.

I used a nice app called Extractor that extracts all the graphics from iPhone.

In iOS7 I managed to retrieve the image called UINavigationBarBackIndicatorDefault and it was in black colour, since I needed a red tint I change the colour to red using Gimp.. EDIT: . As was mentioned by btate in his comment, there is no need to change the color with the image editor.

The following code should do the trick:.
imageView.tint = [UIColor redColor]; imageView.image = [[UIImage imageNamed:@"UINavigationBarBackIndicatorDefault"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; 
Then I created a view that contains an imageView with that arrow, a label with the custom text and on top of the view I have a button with an action.

Then I added a simple animation (fading and translation).. The following code simulates the behaviour of the back button including animation..
-(void)viewWillAppear:(BOOL)animated{         UIImageView *imageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"UINavigationBarBackIndicatorDefault"]];         [imageView setTintColor:[UIColor redColor]];         UILabel *label=[[UILabel alloc] init];         [label setTextColor:[UIColor redColor]];         [label setText:@"Blog"];         [label sizeToFit];          int space=6;         label.frame=CGRectMake(imageView.frame.origin.x+imageView.frame.size.width+space, label.frame.origin.y, label.frame.size.width, label.frame.size.height);         UIView *view=[[UIView alloc] initWithFrame:CGRectMake(0, 0, label.frame.size.width+imageView.frame.size.width+space, imageView.frame.size.height)];          view.bounds=CGRectMake(view.bounds.origin.x+8, view.bounds.origin.y-1, view.bounds.size.width, view.bounds.size.height);         [view addSubview:imageView];         [view addSubview:label];          UIButton *button=[[UIButton alloc] initWithFrame:view.frame];         [button addTarget:self action:@selector(handleBack:) forControlEvents:UIControlEventTouchUpInside];         [view addSubview:button];          [UIView animateWithDuration:0.33 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{             label.alpha = 0.0;             CGRect orig=label.frame;             label.frame=CGRectMake(label.frame.origin.x+25, label.frame.origin.y, label.frame.size.width, label.frame.size.height);             label.alpha = 1.0;             label.frame=orig;         } completion:nil];          UIBarButtonItem *backButton =[[UIBarButtonItem alloc] initWithCustomView:view]; }  - (void) handleBack:(id)sender{ } 
EDIT:. Instead of adding the button, in my opinion the better approach is to use a gesture recognizer.

.
UITapGestureRecognizer* tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleBack:)]; [view addGestureRecognizer:tap]; [view setUserInteractionEnabled:YES]; 


5:


I'm not sure if this would work, but you could try creating a UINavigationController with the default settings to create the button, find the button in the navigation controller's subview hierarchy, call removeFromSuperview on it, destroy the navigation controller, and then add the button as a subview of your toolbar.

You may also need to retain and the button before calling removeFromSuperview (and then release it after adding it as subview of your toolbar) to avoid it being deallocated during the process..


6:


To make a UIButton with an arrow pretty close (I'm not a designer ;) to the iOS 7 system back arrow:. Standard: . Standard system back arrow . Apple SD Gothic Neo. Apple SD Gothic Neo < character. In Xcode:.
  • Focus on the title value field of the button (or any other view/control with text content)
  • Open Edit -> Special Characters
  • Select the Parentheses group and double click the '<' character
  • Change font to: Apple SD Gothic Neo, Regular with desired size (e.g.

    20)
  • Change colour as you like
Ref @staticVoidMan's answer to Back-like arrow on iOS 7.


7:


    self.navigationItem.leftBarButtonItem = self.navigationItem.backBarButtonItem; 
Works for me.

I used this when I had more tabs then could fit on the tab bar, and a view controller pushed from the "More" overrode the leftBarButtonItem in its viewDidLoad..


8:


You can find the source images by extracting them from Other.artwork in UIKit ${SDKROOT}/System/Library/Frameworks/UIKit.framework/Other.artwork.

The modding community has some tools for extracting them, here.

Once you extract the image you can write some code to recolor it as necessary and set it as the button image.

Whether or not you can actually ship such a thing (since you are embedding derived artwork) might be a little dicey, so maybe you want to talk to a lawyer..


9:


The Three20 library has a way to do this:.
  UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle: @"Title" style:UIBarButtonItemStylePlain                                                                  target:self action:@selector(foo)];    UIColor* darkBlue = RGBCOLOR(109, 132, 162);    TTShapeStyle* style = [TTShapeStyle styleWithShape:[TTRoundedLeftArrowShape shapeWithRadius:4.5] next:     [TTShadowStyle styleWithColor:RGBCOLOR(255,255,255) blur:1 offset:CGSizeMake(0, 1) next:     [TTReflectiveFillStyle styleWithColor:darkBlue next:     [TTBevelBorderStyle styleWithHighlight:[darkBlue shadow]                                      shadow:[darkBlue multiplyHue:1 saturation:0.5 value:0.5]                                       width:1 lightSource:270 next:     [TTInsetStyle styleWithInset:UIEdgeInsetsMake(0, -1, 0, -1) next:     [TTBevelBorderStyle styleWithHighlight:nil shadow:RGBACOLOR(0,0,0,0.15)                                         width:1 lightSource:270 next:nil]]]]]];    TTView* view = [[[TTView alloc] initWithFrame:CGRectMake(0, 0, 80, 35)] autorelease];   view.backgroundColor = [UIColor clearColor];   view.style = style;   backButton.customView = view;     self.navigationItem.leftBarButtonItem = backButton; 


10:


I found that using the following, simple code did the trick (requires custom image in bundle): .
// Creates a back button instead of default behaviour (displaying title of previous screen)     UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back_arrow.png"]                                                                    style:UIBarButtonItemStyleBordered                                                                   target:self                                                                   action:@selector(backAction)];      tipsDetailViewController.navigationItem.leftBarButtonItem = backButton;     [backButton release]; 


11:


Here's what I ended up doing after searching through all these solutions and others.

It uses a stretchable png's extracted from the UIKit stock images.

This way you can set the text to whatever you liek.
// Generate the background images UIImage *stretchableBackButton = [[UIImage imageNamed:@"UINavigationBarDefaultBack.png"] stretchableImageWithLeftCapWidth:14 topCapHeight:0]; UIImage *stretchableBackButtonPressed = [[UIImage imageNamed:@"UINavigationBarDefaultBackPressed.png"] stretchableImageWithLeftCapWidth:13 topCapHeight:0]; // Setup the UIButton UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; [backButton setBackgroundImage:stretchableBackButton forState:UIControlStateNormal]; [backButton setBackgroundImage:stretchableBackButtonPressed forState:UIControlStateSelected]; NSString *buttonTitle = NSLocalizedString(@"Back", @"Back"); [backButton setTitle:buttonTitle forState:UIControlStateNormal]; [backButton setTitle:buttonTitle forState:UIControlStateSelected]; backButton.titleEdgeInsets = UIEdgeInsetsMake(0, 5, 2, 1); // Tweak the text position NSInteger width = ([backButton.titleLabel.text sizeWithFont:backButton.titleLabel.font].width + backButton.titleEdgeInsets.right +backButton.titleEdgeInsets.left); [backButton setFrame:CGRectMake(0, 0, width, 29)]; backButton.titleLabel.font = [UIFont boldSystemFontOfSize:13.0f]; [backButton addTarget:self action:@selector(yourSelector:) forControlEvents:UIControlEventTouchDown]; // Now add the button as a custom UIBarButtonItem UIBarButtonItem *backButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:backButton] autorelease]; self.navigationItem.leftBarButtonItem = backButtonItem; 


12:


It's easy to do with Interface Builder in Xcode 5.x. Result .
  • use Toolbar and Bar Button Item from Object library. Components .
  • in button's Attributes inspector edit Image section with your back button image. Attributes inspector.
Done!.


13:


back arrow. If you don't want to bother with image files, the arrow shape can be drawn in a UIView subclass with the following code:.
- (void)drawRect:(CGRect)rect {     float width = rect.size.width;     float height = rect.size.height;     CGContextRef context = UIGraphicsGetCurrentContext();      CGContextBeginPath(context);     CGContextMoveToPoint(context, width * 5.0/6.0, height * 0.0/10.0);     CGContextAddLineToPoint(context, width * 0.0/6.0, height * 5.0/10.0);     CGContextAddLineToPoint(context, width * 5.0/6.0, height * 10.0/10.0);     CGContextAddLineToPoint(context, width * 6.0/6.0, height * 9.0/10.0);     CGContextAddLineToPoint(context, width * 2.0/6.0, height * 5.0/10.0);     CGContextAddLineToPoint(context, width * 6.0/6.0, height * 1.0/10.0);     CGContextClosePath(context);      CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);     CGContextFillPath(context); } 
where the arrow view is proportional to a width of 6.0 and a height of 10.0.


14:


To create an image for the UIToolbar, make a png in photoshop and WHERE EVER there is ANY colour it puts it white, and where it's alpha = 0 then it leaves it alone.. The SDK actually put's the border around the icon you have made and turns it white without you having to do anything.. See, this is what I made in Photoshop for my forward button (obviously swap it around for back button):. http://twitpic.com/1oanv. and this is what it appeared like in Interface Builder. http://twitpic.com/1oaoa.


15:


I was trying to do the same thing, but I wanted the back button to be in the navigation bar.

(I actually needed a back button, that would do more than only going back, so I had to use the leftBarButtonItem property).

I tried what AndrewS suggested, but in the navigation bar it wouldn't look the way it should, as the UIButton was kind of casted to a UIBarButtonItem.. But I found a way to work around this.

I actually just put a UIView under the UIButton and set the customView for the UIBarButtonItem.

Here is the code, if somebody needs it:.
// initialize button and button view UIButton *backButton = [UIButton buttonWithType:101]; UIView *backButtonView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, backButton.frame.size.width, backButton.frame.size.height)];  [backButton addTarget:self action:@selector(backButtonTouched:) forControlEvents:UIControlEventTouchUpInside]; [backButton setTitle:@"Back" forState:UIControlStateNormal]; [backButtonView addSubview:backButton];  // set buttonview as custom view for bar button item UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButtonView]; self.navigationItem.leftBarButtonItem = backButtonItem;  // push item to navigationbar items [self.navigationController.navigationBar setItems:[NSArray arrayWithObject:backButtonItem]]; 


16:


Solution WITHOUT using a png.

Based on this SO answer: Adding the little arrow to the right side of a cell in an iPhone TableView Cell. Just flipping the UITableViewCell horizontally!.
UIButton *btnBack = [[UIButton alloc] initWithFrame:CGRectMake(0, 5, 70, 20)];  // Add the disclosure CGRect frm; UITableViewCell *disclosure = [[UITableViewCell alloc] init]; disclosure.transform = CGAffineTransformScale(CGAffineTransformIdentity, -1, 1); frm = self.btnBack.bounds; disclosure.frame = CGRectMake(frm.origin.x, frm.origin.y, frm.size.width-25, frm.size.height); disclosure.accessoryType = UITableViewCellAccessoryDisclosureIndicator; disclosure.userInteractionEnabled = NO; [self.btnBack addSubview:disclosure];  // Add the label UILabel *lbl = [[UILabel alloc] init]; frm = CGRectOffset(self.btnBack.bounds, 15, 0); lbl.frame = frm; lbl.textAlignment = NSTextAlignmentCenter; lbl.text = @"BACK"; [self addSubview:lbl]; 


17:


If you want to avoid drawing it yourself, you could use the undocumented class: UINavigationButton with style 1.

This could, of course, stop your application from being approved...

/John.


18:


Well, you don't have to have a different button for every size, you can use [UIImage stretchableImageWithLeftCapWidth:topCapHeight:], but the only thing I've found is custom images..


19:


I had a similar problem, and come out one library PButton.

And the sample is the back navigation button like button, which can be used anywhere just like a customized button.

. Something like this: enter image description here.


20:


Try this.

I am sure you do not need a back button image to create one such..
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back"                                                                style:UIBarButtonItemStyleBordered                                                               target:self                                                               action:@selector(yourSelectorGoesHere:)]; self.navigationItem.backBarButtonItem = backButton; 
That's all you have to do :).


21:


Why are you doing this? If you want something that looks like a navigation bar, use UINavigationBar.. Toolbars have specific visual style associated with them.

The Human Interface Guidelines for the iPhone state:.
A toolbar appears at the bottom edge of the screen and contains buttons that perform actions related to objects in the current view..
It then gives several visual examples of roughly square icons with no text.

I would urge you to follow the HIG on this..



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