This is bugging the heck out of me! I'm just trying to programmatically add a right-side "flash" button to my navigation bar, and for whatever reason, I can't make it appear. My code is below. Can anyone help me? Thanks in advance.
//Note: flashButton is declared as a UIButton property in .h, and synthesized in .m
UIView *flashContainer = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 36, 36)];
[flashButton addTarget:self action:#selector(toggleTorch) forControlEvents:UIControlEventTouchUpInside];
[flashButton setBackgroundImage: [UIImage imageNamed:#"FlashIconInactive_small.png"] forState:UIControlStateNormal];
[flashButton setBackgroundImage: [UIImage imageNamed:#"FlashIconActive_small.png"] forState:UIControlStateHighlighted];
[flashContainer addSubview:flashButton];
[flashButton sizeToFit];
UIBarButtonItem *flashButtonItem = [[UIBarButtonItem alloc] initWithCustomView:flashContainer];
scannerVC.delegate = self;
scannerVC.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:#selector(cancelTapped)];
[[scannerVC navigationItem] setRightBarButtonItem:flashButtonItem];
Is flashButton connected to a button in a xib or storyboard via an IBOutlet? If not, you'll need to create an instance of UIButton using +[UIButton buttonWithType:].
Another test to try is to set a breakpoint on your first line (the addTarget: one) and enter po flashButton in the debugger. What's the output? If it's nil, then your button doesn't exist and needs to be created.
Related
How can I reload/reassign navigation bar items? I use some libraries that change navigation bar and sometimes I have a bag in which all navigation items disappear. I have reassigned right items in viewWillAppear like:
UIButton *actionButton = [UIButton buttonWithType:UIButtonTypeCustom];
actionButton.frame = CGRectMake(270, 0, 50, 50);
actionButton.adjustsImageWhenHighlighted = YES;
[actionButton setImage:[UIImage imageNamed:#"share.png"] forState:UIControlStateNormal];
[actionButton setImage:[UIImage imageNamed:#"share-active.png"] forState:UIControlStateHighlighted];
[actionButton addTarget:self action:#selector(presentActivity) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *actionBarButton = [[UIBarButtonItem alloc]initWithCustomView:actionButton];
actionBarButton.tintColor = [UIColor whiteColor];
self.navigationItem.rightBarButtonItem = actionBarButton;
But it does not work and sometimes I do not have any navigation items.
UIBarButtonItem
is not child of UIButton.
here is not known methods like setImage:forState: etc.
create and custon an UITabBarButton like this
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle:#"" style:UIBarButtonItemStyleBordered target:self action:#selector(goBack)];
newBackButton.image = [UIImage imageNamed:#"back"];
self.navigationItem.leftBarButtonItem=newBackButton;
also verify if method with this code will be called when viewDidLoad
Check out this like https://developer.apple.com/library/ios/documentation/uikit/reference/uinavigationbar_class/Reference/UINavigationBar.html the apple dev is awesome.
This is another good link
AppCoda has a lot of great tutorials this one has everything you need to know about Nav Bars
http://www.appcoda.com/customize-navigation-status-bar-ios-7/
and you could also use perform segue with identifier method and to send a string or something to a new view controller and then when you see that string is equal to what you want use an if statement in your viewWillAppear method.
I use this category method on UIBarButtonItem to create custom buttons as follows:
+ (UIBarButtonItem*)itemWithImage:(UIImage*)image forState:(UIControlState)controlState target:(id)target action:(SEL)action{
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:image forState:controlState];
button.frame= CGRectMake(0.0, 0.0, 44, 44);
[button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
UIView *v=[[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 44, 44) ];
[v addSubview:button];
return [[UIBarButtonItem alloc] initWithCustomView:button];
}
I then create the buttons and assign them to the navigation item in my view controller as follows:
-(void)viewDidLoad{
[super viewDidLoad];
UIBarButtonItem * cancelButtonItem = [UIBarButtonItem itemWithImage:[UIImage imageNamed:#"Cancel"] forState:UIControlStateNormal target:self action:#selector(cancel)];
self.navigationItem.leftBarButtonItem = cancelButtonItem;
UIBarButtonItem * checkmarkButtonItem = [UIBarButtonItem itemWithImage:[UIImage imageNamed:#"checkmark_active"] forState:UIControlStateNormal target:self action:#selector(done)];
self.navigationItem.rightBarButtonItem = checkmarkButtonItem;
}
The first time I create a view controller and push it, the button works, but when creating a brand new view controller and pushing it onto the navigation stack, it breaks. Any ideas? I have thoroughly debugged this and am out of ideas.
There doesn't appear to be anything wrong with the category section of your code. I suspect that the error might be stemming from something else. Some more information or code may help here... what do you mean by break etc.
Check the way you initialise the ViewController before you push it onto the stack, perhaps a simple syntax error or mistaken nib name if using outlets.
I'm looking for a way to create programmatically an UIBarButtonItem that looks like a back button of UINavigationBar.
Apparently seems like that the back button appears only after a push on the UINavigationController.
So I'm able to insert only a button with the "cancel" style. But my goal is to create a button with the "New Item" style.
Ideas ?
the short answer is you cannot do it.
you can save an image and you can put the image to that position, but the back button is managed by private part of the UINavigationBar.
I think you need to use image. and then set the image be the buttons backgroundImage. such as :
navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
UINavigationItem *navigationItem = [[[UINavigationItem alloc] initWithTitle:#"Detail"] autorelease];
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 70, 30)];
[button setImage:[UIImage imageNamed:#"plain.png"] forState:UIControlStateNormal];
[button addTarget:self action:#selector(buttonClicked:)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc]
initWithCustomView:button];
navigationItem.leftBarButtonItem = buttonItem;
[buttonItem release];
[button release];
[navigationBar pushNavigationItem:navigationItem animated:NO];
[self.view addSubview:navigationBar];
Take a look on this answer : Creating a left-arrow button (like UINavigationBar's "back" style) on a UIToolbar
It gives you a psd file with image that you need.
It works for me:
[self.navigationItem.leftBarButtonItem setTitle:#"Back"];
(custom text with back arrow)
I need to use a simple UIBarButtonItem in a UIToolBar.
I used this code to add the button with my custom image to the navigation bar:
UIBarButtonItem *cloneButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"image_sheep.png"] style:UIBarButtonItemStylePlain target:self action:#selector(clone)];
NSArray *rightItems = [NSArray arrayWithObject:cloneButton];
self.navigationItem.rightBarButtonItems = rightItems;
The result is what I want and it looks like this
navigation bar http://img207.imageshack.us/img207/3383/navigationbara.jpg
When doing the same thing in a UIToolBar that I'm adding to a UITableViewCell's contentView
UIBarButtonItem *cloneButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"image_sheep.png"] style:UIBarButtonItemStylePlain target:self action:#selector(clone)];
UIBarButtonItem *leftSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
toolbar.items = [NSArray arrayWithObjects:leftSpace, cloneButton, nil];
The problem is that I get something like this:
toolbar http://img209.imageshack.us/img209/1374/toolbary.jpg
This is surely due to the fact that UINavigationBar and UIToolBar are not drawn the same way...
Can someone please point out how to resolve this problem?
On your UIToolbar use UIBarButtonItemStyleBordered instead of UIBarButtonItemStylePlain.
UINavigationBar will not draw the button the same without the button look.
That's how UIToolbar is supposed to work. Per the documentation:
Toolbar images that represent normal and highlighted states of an item derive from the image you set using the inherited image property from the UIBarItem class. For example, the image is converted to white and then bevelled by adding a shadow for the normal state.
That said, you might be able to get the result you want by creating a UIBarButtonItem with a custom view instead of an image. Like so:
UIImage *sheepImage = [UIImage imageNamed:#"image_sheep.png"];
UIButton *sheepButton = [UIButton buttonWithType:UIButtonTypeCustom];
[sheepButton setImage:sheepImage forState:UIControlStateNormal];
[sheepButton addTarget:self action:#selector(clone) forControlEvents:UIControlEventTouchUpInside];
[sheepButton setShowsTouchWhenHighlighted:YES];
[sheepButton sizeToFit];
UIBarButtonItem *cloneButton = [[UIBarButtonItem alloc] initWithCustomView:sheepButton];
I haven't tested this, so I don't know if it will work.
I cannot see the images posted in the question anymore. But I am pretty sure that we're trying to mimic the UIBarButtonItemStylePlain of the UIToolBar in a UINavigationBar.
Benzado is pretty much spot on except for this line:
[sheepButton setImage:sheepImage forState:UIControlStateNormal];
This puts the image in front of the touch indicator. The UIToolBar shows the touch in front of the image. So to mimic the UIToolBar style in a UINavigationBar:
UIImage *sheepImage = [UIImage imageNamed:#"image_sheep.png"];
UIButton *sheepButton = [UIButton buttonWithType:UIButtonTypeCustom];
[sheepButton setBackgroundImage:sheepImage forState:UIControlStateNormal];
[sheepButton addTarget:self action:#selector(clone) forControlEvents:UIControlEventTouchUpInside];
[sheepButton setShowsTouchWhenHighlighted:YES];
[sheepButton sizeToFit];
UIBarButtonItem *cloneButton = [[UIBarButtonItem alloc] initWithCustomView:sheepButton];
Following is a code to display a button to the toolbar.
UIButton myButton = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *myImage = [UIImage imageNamed:#"img1.png"];
[myButton setBackgroundImage:myImage forState:UIControlStateNormal];
UIBarButtonItem *myToolbarButton = [[UIBarButtonItem alloc] initWithCustomView:myButton];
Nothing gets displayed on the toolbar. Please tell me what is wrong.
[myToolbar setItems:[NSArray arrayWithObject:myToolbarButton]]; // might help
OR if it's a navigation bar
self.navigationItem.rightBarButtonItem = myToolbarButton;
Also you should set the frame for the custom button, something like this:
UIButton *mybutton = [[UIButton alloc] initWithFrame:CGRectMake:0,0,200,50];
Then if you want to add a selector/callback:
[myButton addTarget:self action:#selector(someMethod) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.leftBarButtonItem = myButtonItem; // and change for the right button.
Where self is a UIViewController.
You forgot to add this button to the toolbar!
NSArray *toolbarItems = [[NSArray alloc] initWithObjects:myToolbarButton,nil]; // you can more buttons here
[aToolbar setItems:toolbarItems animated:NO]; // change to YES if you want to have nice animation
[toolbarItems release];
If you want to add a button to navigation bar, use this:
[self.navigationItem setRightBarButtonItem:myToolbarButton]; // or setLeft...
Also, you should remember to set the frame of myButton:
[myButton setFrame:CGRectMake(0, 0, 30, 32)];