i am trying to create a toolbar with buttons. and the button i want to have is an image rather title. The current non working code is:
let imageName = "yourImage.png"
self.myUIBarButtonBack = UIBarButtonItem(image: UIImage(named: imageName), style:.plain, target: self, action: #selector(onClickBarButton))
I have 2 questions:
1. where should i place the yourImage.png in my application
2. is this code sufficient to render image or i need to do things like putting it into imageView component and make it visible etc. ?
The best approach is to add images in xcassets. This is the best way you can organize images. The concept of App slicing applies here.
You don't need to put the image in image view in the case of bar button item.
Try changing the rendring option as Original Image instead of Default.
One way is create custom button and assign to toolbar like navigationbar
self.navigationItem.hidesBackButton = true
let button = UIButton.init(type: .custom)
button.setImage(UIImage.init(named: "back_icon"), for: UIControlState.normal)
button.addTarget(self, action:#selector(onClickBackBarItem), for: UIControlEvents.touchUpInside)
button.frame = CGRect.init(x: 0, y: 0, width: 25, height: 25)
let barButton = UIBarButtonItem.init(customView: button)
self.navigationItem.leftBarButtonItem = barButton
Related
I'm customizing the appearance of the .searchable() modifier of SwiftUI with the appearance API of UISearchBar.
Almost everything works, except the font of the text field, and I have no idea why (setting the font of the cancel button works, or setting the background color or text color of the text field also work, so the correct reference is there).
Talk is cheap, show me the code!
let textAttributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.systemBlue, // this works
.font: UIFont.boldSystemFont(ofSize: 15) // this doesnt
]
let placeholder = NSAttributedString(
string: "Search...", // this doesnt
attributes: [
.foregroundColor: UIColor.systemGray, // this works
.font: UIFont.boldSystemFont(ofSize: 15) // this doesnt
])
let textFieldAppearance = UITextField
.appearance(whenContainedInInstancesOf: [UISearchBar.self])
textFieldAppearance.backgroundColor = .red // this works
textFieldAppearance.defaultTextAttributes = textAttributes // color works, font not
textFieldAppearance.attributedPlaceholder = placeholder // color works, font or text not
I guess it's time to file a -radar- feedback?
I haven't found a reliable way of customizing this, with the solution posted below there's a glitch on the search bar that happens when SwiftUI re-renders the view (scrolling or just typing on the search bar), that is very obvious on a real device (not so much on the simulator).
Old answer:
Far from ideal, I found a way to make it work, which is introspecting the view searching for the UITextField and setting the font directly. The easiest way to do this is using a library like SwiftUI-Introspect (https://github.com/siteline/SwiftUI-Introspect).
Then on the View you're using .searchable() from just:
.introspectTextField { textField in
textField.font = UIFont.boldSystemFont(ofSize: 15)
}
Fixed! The perfect solution would be to use the appearance API, but I guess we'll have to wait till iOS 16...
Setting the .font and .foregroundColor modifiers after .searchable will do the desired result, but it still doesn't work with .background modifier (if you want it) as the time of this writing (iOS 16).
How do I adjust the padding of a Swift UI "back" navigation button? i.e. the blue "Navigation" text in the image below (Image contributed by someone else on a different question). I want to add more space between the text and the leading edge of the screen.
You can use custom appearance for this purpose configured in the init of view holding NavigationView.
Here is a demo (with big offset for better visibility). Prepared with Xcode 13 / iOS 15.
init() {
let appearance = UINavigationBarAppearance()
appearance.backButtonAppearance.normal.titlePositionAdjustment =
UIOffset(horizontal: 40, vertical: 0)
UINavigationBar.appearance().standardAppearance = appearance
}
I have the following set up for my UIToolBar / Accessory View on a view controller
#IBOutlet var inputFieldView: UIToolbar!
override var canBecomeFirstResponder: Bool{
return true
}
override var inputAccessoryView: UIView?{
return self.inputFieldView
}
then inside my viewDidLoad I have:
let seperator = UIView(frame: CGRect(x:0 , y: 0, width: ScreenSize.width(), height: 1))
seperator.backgroundColor = UIColor.lightBackground
self.inputFieldView.addSubview(seperator)
self.inputFieldView.isTranslucent = false
self.inputFieldView.setShadowImage(UIImage(), forToolbarPosition: .any)
self.inputFieldView.setBackgroundImage(UIImage(), forToolbarPosition: .any, barMetrics: .default)
self.inputFieldView.removeFromSuperview()
This worked great for ios versions 10 and 9. It is a text view with a "Send" button. It sits at the bottom of the screen and when pressed, becomes first responder allowing the keyboard to come up and it positions itself correctly.
With ios 11 i cannot even click on it when it is at the bottom, so I cannot type at all.
This is a known bug on iOS 11. UIToolbar subviews don't get the touch events because some internal views to the toolbar aren't properly setup.
The current workaround is to call toolBar.layoutIfNeeded() right before adding subviews.
In your case:
inputFieldView.layoutIfNeeded()
Hopefully this will get fixed on the next major version.
Solved it. It looks like UIToolbar's just are not working correctly in iOS 11.
Changed it to an UIView and removed
self.inputFieldView.isTranslucent = false
self.inputFieldView.setShadowImage(UIImage(), forToolbarPosition: .any)
self.inputFieldView.setBackgroundImage(UIImage(), forToolbarPosition: .any, barMetrics: .default)
got it working (and changed it to a UIView from UIToolbar in the xib as well.)
I add Left Navigation Back button in collection view controller with code.
//Add Navigation Bar
navbar.autoresizingMask = [.flexibleWidth, .flexibleBottomMargin, .flexibleRightMargin]
navbar.delegate = self
UINavigationBar.appearance().barTintColor = UIColor(red: 0.0/255.0, green:49.0/255.0, blue:79.0/255.0, alpha:0.1)
UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().isTranslucent = true
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.white]
navItem.title = prefs.value(forKey: "PROVIDER_NAME") as! String?
let image = UIImage(named: "back_image")
navItem.leftBarButtonItem = UIBarButtonItem(image: image, style: .plain, target: self, action: #selector(addTapped))
navItem.leftBarButtonItem?.imageInsets = UIEdgeInsetsMake(0, 0, 0, 0)
Back button is so close to the left. I would like to add padding about 10px from the left. So, I changed the code into
navItem.leftBarButtonItem?.imageInsets = UIEdgeInsetsMake(0, 15, 0, 0)
but it is not working and image Back button looks smaller. How can I do to add space to the left of Back button?
I would recommend replacing UINavigationBar with a simple UIView. This way you would gain a full control over the layout of the navigation bar. It wouldn't be anything more than a transparent UIView with a back button and a title label inside. As simple as that.
The real UINavigationBar is more than that. It's meant to manage a stack of UINavigationItem objects. It adjusts itself depends on the current item and knows how to make an animated (and even interactive) transition from one state to another. That's why you can't change much about the bar's appearance. You shouldn't treat it as a regular view.
UPDATE
Another way to achieve this is a little tricky. You can implement it completely from a storyboard and you don't need mess with appearance.
Add UINavigationBar to a view controller.
Add a plain UIView to the left side of UINavigationBar and make its background color completely transparent.
Add UIButton to the view added in the previous step and set a back icon as its image.
Add constraints to the button to align it to the right side of its superview.
Adjust the width of the view so the back button position is exactly where you want it to be.
This is a view hierarchy in the storyboard:
This is how your UINavigationBar will look like (for you the background will be transparent):
I need a select box with options and an on select / on change so i can populate a second select box.
My first instinct was to just create one using a surface with a click event and a renderController / scrollview to make my drop down appear. This works wonderfully except that if I leave and come back to the page the zindex of the scrollview breaks and it scrolls over the container size.
Its a bug I need to deal with but my other problem is that with the small Iphone screen size conventional drop downs just eat to much screen real-estate.
This stackoverflow famo.us: how to handle textbox.onchange events had some great hints on how to edit an InputSurface. I thought using that and looking at the code for a Surface I could do it but no luck.
Any Ideas on how to deal with the lack of a select surface?
You can access the value property from inside the callback function:
function SelectSurface(options) {
Surface.apply(this, arguments);
this.onchange = options.onchange;
this._superDeploy = Surface.prototype.deploy;
SelectSurface.prototype.elementType = 'select';
}
SelectSurface.prototype = Object.create(Surface.prototype);
SelectSurface.prototype.constructor = SelectSurface;
SelectSurface.prototype.deploy = function deploy(target) {
target.onchange = this.onchange;
this._superDeploy(target);
};
var regionSelector = new SelectSurface({
size:[140,40],
onchange: regionSelect(),
content: '<option disabled selected style="display:none;">REGION</option><option value="central">CENTRAL</option><option value="northern">NORTHERN</option><option value="pacific">PACIFIC</option><option value="southern">SOUTHERN</option><option value="western">WESTERN</option>',
});
var regionSelect = function(){
return function() {
alert(this.value);
}
};