I am just getting started in iOS development after working in Android since the early days and I am a bit confused on how you style/skin iPhone components.
I saw that there is a way to change the color for some components (is that what they are called?) in properties but how can I go even further?
For example, how could I be designing a custom button, or custom listview?
There are several elements here you are asking, so my answer might not be enough for everything you want.
You can for instance use this page here that give you a real nice tutorial for doing some customization to UI components:
http://www.raywenderlich.com/4344/user-interface-customization-in-ios-5
For UITableViews there are other steps you would have to take. For instance, this very good tutorial:
http://cocoawithlove.com/2009/04/easy-custom-uitableview-drawing.html
If you create custom UI elements to replicate standard UI elements in
all but appearance, you should instead consider using the appearance
customization programming interfaces available in iOS 5 and later.
via HIG
Which i suggest viewing this to get the best understanding of the interface builder
For a Button as an image:
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *image = [UIImage imageNamed:#"myFile.png"];
button.frame = CGRectMake(x, y, image.size.width, image.size.height);
[button setImage:image forState:UIControlStateNormal];
[myView addSubview:button];
or with the interface builder:
select "Custom Button" as the type and then select the image you want
from a drop-down menu.
I'm losing my mind over this one. I have UIButton connected as Outlet. I want to change it's image. In the viewDidLoad function, I try to set the image like so:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
Nothing happens. However, if I use ImagePicker, it somehow works. In the ImagePickers function "didFinishPickingImage", I repeat the exactly same command as above for setting image and it works, the image is displayed normally.
I've been thinking that maybe the button's image is not refreshing itself, but trying to call [button1 setNeedsDisplay], or [button1.imageView setNeedsDisplay] or even [button1.imageView.image setNeedsDisplay] does nothing.
Does anyone have any idea about this? I've wasted two hours by now and I'm really getting frustrated, because I'm certain that the reason must be so stupid it's unbelivable.
Please check your button type.
If your button type is "System" you should change it to "Custom"
Two things to do here:
#1, change your code to:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
and #2
make sure your UIImage returns a valid image.
In other words,
UIImage * imageToSet = [UIImage imageNamed: #"house.png"];
if(imageToSet)
{
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
} else {
// if you see this line in your console, then you know where to look for a problem
NSLog( #"why is my image object nil?");
}
For anyone who will find themselves in a similar situation; I was using the mentioned button inside a custom cell for table view. However, the cells aren't loaded right away (i.e. inside viewDidLoad/viewWillAppear etc.), but inside the tableView:cellForRowAtIndexPath function. All my button variables were nil at that point. My solution was to load the image after the cell has been created and it has worked straight away afterwards.
Here are a couple additional notes. UIButton setImage: forState: is the correct method:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
imageNamed is a great convenience method for grabbing the image, but make sure it returns an object. Forgetting to include the image file in the current target gets me all of the time.
[UIImage imageNamed:#"house.png"]
You also don't need the extension. The SDK works this out.
[UIImage imageNamed:#"house"]
And even though UIControlState is a bit mask, you cannot OR the values together. This does not not not work and I must must must remember this because it gets me every time I use the call.
// NO NO NO
[button1 setImage:[UIImage imageNamed:#"house"] forState:UIControlStateNormal|UIControlStateSelected];
// YES
[button1 setImage:[UIImage imageNamed:#"house"] forState:UIControlStateNormal];
[button1 setImage:[UIImage imageNamed:#"house"] forState:UIControlStateSelected];
Was getting the same problem when UIbutton was in UITableViewCell.
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:#"detail.png"] forState:UIControlStateNormal];
should work in UITableViewCell
Glad to know that the problem is solved but none of the answers actually addresses the problem.
Generally, if the code is correct, then the error shifts from "syntax error" to the "logical error" category. There is no definite guide to handle it but here is a small checklist that can help anyone to troubleshoot their code.
1) The IBOutlet is not connected or renamed.
2) Make sure that the UIButton type is custom.
3) The image is set (more than once), somewhere else in the code.
4) You are trying to set the Image through any sync method which is not using the main thread. (There are several threads on that alone).
5) If you are nesting the images as subviews, make sure the problem isn't with their parent view.
6) If it is appearing in Simulator but not in the device, It's a lettercase (Uppercase, lowercase difference in the code and the filename.
7) Modern simulators works with very low GPU memory on older machines. You can tweak the simlator options to make it appear. E.g (Command + Right Arrow) twice to change the simulator orientation and your changes will appear.
There are few other but common pitfalls where developers usually overlook
1) The image doesn't exist OR you are making a spelling mistake.
2) The filetype is different than mentioned. (JPG, PNG).
Last thing you'll want to check - make sure you're setting the image on the main thread! Just ran into an issue where I was setting a button image in a callback from ALAssetLibrary (fetching images from photo library). The image wouldn't update until I tapped the button. Turns out the callback was happening off main...
for those having issues with system images not appearing, just use systemName: instead of named
if let starImg = UIImage(systemName: "star.fill") {
button.setImage(starImg, for: .normal)
}
It's for ios13 and later...
For me it was to move the line:
[button1 setImage:[UIImage imageNamed:#"house.png"] forState:UIControlStateNormal];
from awakeFromNib method
to viewDidLoad method
I guess,
don't create like this
UIButton *nextButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
by this create method ,UIButton is create by use default type,so your background image is not work.
try this,
UIButton *nextButton = [[UIButton alloc] initWithFrame:CGRectMake(9, 154, 300, 48)];
or other,except buttonWithType
This is happening because the state of the Button doesn't stays selected once clicked by default.
I solved it by making an IBaction on that button click and toggling the selected state.
-(IBAction) checkButtonClicked:(id)sender{
checkButton.selected = !checkButton.selected;
}
In my case, it is drawn by custom animation code and not set by the image, so it doesn't work by setting any image, it has to change the animation code.
With images, you have to import them into the project not as references but as copies. So when you go to add files to project, choose "Create groups" instead of "Create folder references". Also make sure "Copy items if needed" is checked.
This is confusing because importing as references works when you are using images as textures (e.g. for Sprites). However, it doesn't work when you want to use images for buttons (e.g. for using image name in [UIImage imageNamed:#"house.png"]
I faced this same issue of the image not being shown on the UIButton.
I had to change this line -
myButton.setImage(<my_UIImage_object>, for: [.normal, .focused])
to this -
myButton.setImage(<my_UIImage_object>, for: .normal)
In my app i have an option for adding notes to particular tips.the button for adding notes is at the top.So i want to highlight that particular button when a notes is added.If a Tip has a note attached the notes icon should light up / glow (somehow look different), so that it can quickly identify this tip has a note attached.How can i implement this one.Is it possible.Can any one Please help me.Thanks in advance
We used some special button in tool bar in an application. We make it following way.
UIButton* btnInfo = [UIButton buttonWithType:UIButtonTypeInfoLight];
[btnInfo addTarget:self action:#selector(verInfoBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *modalButton = [[UIBarButtonItem alloc] initWithCustomView:btnInfo];
Here main point is to use [[UIBarButtonItem alloc] initWithCustomView:btnInfo]; method.
Check if it can be helpful...
I want to change the color of my UIButton. I did this:
UIButton *alreadySubscriber = [[UIButton alloc] initWithFrame:CGRectMake(12, maxy-65, 262.0, 50)];
alreadySubscriber.layer.cornerRadius = 10.0f;
[alreadySubscriber setBackgroundColor:[UIColor orangeColor]];
[alreadySubscriber setTitle:#"Already a subscriber" forState:UIControlStateNormal];
The color of the button changes, but no longer see the effect of bright light booby top. how can I fix this?
We're unable to programmatically set this 'bubble effect' for the UIButton I'm afraid. The only way to go about it far as I can tell is to go for a custom button with an image (or two images for the normal and active states).
The resource Eugene put up earlier seems pretty good in fact.
I don't really know what kind of booby light are you talking about, but have you tried using images for your buttons? I'd suggest using two different images like those you can create here http://dabuttonfactory.com/.
You should create as a custom button and add the image/color as background.
How do I create a back button with a large left-facing arrow like in the iPod app? I'm not asking how to create a left-facing button, but how to get a left-facing arrow as the label on a button, as seen in the iPod app's now playing screen:
Obviously an image would do the trick, but perhaps there is a Unicode character that they used? Also, I'm surprised that there's no discussion about this (or at least none that I could find).
This is the way I would do it. You create the image and set it as the back button. The code below is what I have in my application.
UIImage *imageFullscreen = [UIImage imageNamed: #"fullscreen.png"];
[[self navigationItem] setRightBarButtonItem:[[[UIBarButtonItem alloc] initWithImage:imageFullscreen style:UIBarButtonItemStylePlain target:self action:#selector(hide)]autorelease]];