I am building a tab bar with a prominent middle button for adding a post. The issue I'm running into is that my button fits well on iPhone 11 Pro Max but is not positioned correctly on other size iPhones (see images).
I think the issue is that I'm setting the Y position absolutely instead of relative to the tabBar. I am confused on how to do this since I am adding the button programmatically instead of through the storyboard (where I know how to use relative constraints). Here is where I am setting the position:
override func viewDidLayoutSubviews() {
button.frame = CGRect.init(x: self.tabBar.center.x - 32, y: self.view.bounds.height - 115, width: 64, height: 64)
}
How can I set a relative position programmatically for my button so it is always half above and half below the tab bar, regardless of phone size?
try this
let tabBarHeight = 64
let mainButton: UIButton = UIButton(type: .custom)
mainButton.frame = CGRect(origin: CGPoint(x: 0.0, y: win.frame.size.height),size: CGSize(width: tabBarHeight, height: tabBarHeight))
mainButton.center = CGPoint(x: win.center.x, y: win.frame.size.height - tabBar.layer.bounds.height)
you set the size and set the center of the button to the center of the TabBar or move a little up like this code do.
Just add another tabitem in the storyboard builder and then make:
tabbar.clipsToBounds = false
This is the best solution.
Navigation bar overlaps the image after user back from segue.
When the view first loaded it looks ok but after performing the segue and come back it looks like this.
here is the code for that image
let logoContainer = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 67))
let imageView = UIImageView(frame: CGRect(x: 0, y: -30, width: 200, height: 67))
imageView.contentMode = .scaleAspectFit
let image = UIImage(named: "navbarlogo")
imageView.image = image
logoContainer.addSubview(imageView)
navigationItem.titleView = logoContainer
Honestly, your problem is the fact you are creating an overlap of the ImageView by specifying a -30 y coordinate. It's higher in the z-order (compared to your navigation bar) in one case but lower in the z-order in the segue scenario.
I suspect if you use "Debug View Hierarchy" in XCode in both scenarios, you would be able to see this is what is happening.
I would change your approach as to how the logo container is being laid out
I have a button on tap of which I need to show an image view which I did like below in button action
let imageName = "pointed_image.png"
let image = UIImage(named: imageName)
let imageView = UIImageView(image: image!)
self.addSubview(imageView)
Now i want to position that image on top of button such that bottom center of image lies exactly on top center of button. (Imagine a callout view how it displays in map where pin is the location(button in my scenario) and callout alert is the "starbucks callout" of location (image in my scenario) -
Pls advice how shall i modify the below code to meet the requirement
//Build image view
let imageName = "pointed_image.png"
let image = UIImage(named: imageName)
let imageView = UIImageView(image: image!)
//Get Button frame
let btnFrame = self.infoButton.frame
//position image on top of buttom
// CODE TO MODIFY BELOW
var imgFrame: CGRect = imageView.frame
imgFrame.origin.x = btnFrame.origin.x + 10
imgFrame.origin.y = btnFrame.origin.y - 10
imageView.frame = imgFrame
self.addSubview(imageView)
I would use imageView's center property to place it correctly:
// aligned by centers in x axis
imageView.center = CGPoint(x: self.infoButton.center.x,
// in y axis, using buttons origin and imageView's height placed right on top of the button
y: self.infoButton.frame.origin.y - (imageView.bounds.height / 2))
Problem visually:
I have tried putting the image in the center of its own frame with no luck. I have also tried to center it with playing the x of the CGRect with no luck either. I presume I can just put an empty icon with the same background as the navigation bar; however, I don't want to do it that way. I might have 2-3 icons on the right; then what?
let image = UIImage(named: "some_logo")!
let imageSize = CGSizeMake(60, 42)
let marginX: CGFloat = (self.navigationController!.navigationBar.frame.size.width / 2) - (imageSize.width / 2)
let imageView = UIImageView(frame: CGRect(x: marginX, y: 0, width: imageSize.width, height: imageSize.height))
imageView.image = image
imageView.contentMode = .ScaleAspectFit
self.navigationItem.titleView = imageView
I prefer swift but obj-c solutions are welcomed as well.
Any pointers appreciated.
This app has nothing to do with KIA, it is just some logo I got off the google search, searching "some logo".
I have faced the same issue. Then i tried one code shown below.
override func viewDidAppear(animated: Bool) {
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 150, height: 40))
imageView.contentMode = .ScaleAspectFit
let image = UIImage(named: "googlePlus")
imageView.image = image
navigationItem.titleView = imageView
}
This Code working fine when i tested with Left & Right Bar Button.
But in my previous code there is no Right Bar Button.
So the image is moving towards right.
For solving this i created a Right Bar Button & change the Tint color to clear color.
So everything seems to be working fine. This is one Temporary Solution for your problem.
The easiest way of doing this is in Interface Builder.
Simply drag a 'NavigationItem' from the object library and place it into your ViewController, then place a UIView where the title goes (ensure you set the background to 'clear')
Then place a UIImageView into that view and set the image in the Attributes Inspector to your required image. Scale your UIImage accordingly and set your your constraints accordingly.
I created an extension for solving this problem using the hint of #idrougge.
In order to center the title view image no matter what buttons you have, a content view is set as title view, then the image view is added as child of the content view. Finally, using constraints the image view is aligned inside its parent (content view).
import UIKit
extension UIViewController {
func addLogoToNavigationBarItem() {
let imageView = UIImageView()
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.heightAnchor.constraint(equalToConstant: <your_height>).isActive = true
imageView.contentMode = .scaleAspectFit
imageView.image = <your_image>
//imageView.backgroundColor = .lightGray
// In order to center the title view image no matter what buttons there are, do not set the
// image view as title view, because it doesn't work. If there is only one button, the image
// will not be aligned. Instead, a content view is set as title view, then the image view is
// added as child of the content view. Finally, using constraints the image view is aligned
// inside its parent.
let contentView = UIView()
self.navigationItem.titleView = contentView
self.navigationItem.titleView?.addSubview(imageView)
imageView.centerXAnchor.constraint(equalTo: contentView.centerXAnchor).isActive = true
imageView.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
}
}
I hope this helps someone,
Xavi
As question heading stated "Swift / Obj-C" so I am sharing code of Obj-C :
UIImageView *titleImage = (UIImageView *)self.navigationItem.titleView;
titleImage = [[UIImageView alloc]initWithFrame:CGRectMake((self.navigationController.navigationBar.frame.size.width/2) - (100/2), 0, 100,self.navigationController.navigationBar.frame.size.height)];
//setting the image for UIImageView
titleImage.image = [UIImage imageNamed:#"someLogo"];
titleImage.contentMode = UIViewContentModeCenter;
self.navigationItem.titleView = titleImage;
Had same issue on phones with smaller sizes. Image in title was moving to right. Causing this issue back button -> [back_button][title_view]. Its centered when there is no back button or there is right bar button. Richard Hope's was right, you just need to put UIView first, and then put UIImageView as subview. Programmatically could be done like this.
private var imageView: UIView {
let bannerWidth = navigationBar.frame.size.width * 0.5 // 0.5 its multiplier to get correct image width
let bannerHeight = navigationBar.frame.size.height
let view = UIView()
view.backgroundColor = .clear
view.frame = CGRect(x: 0, y: 0, width: bannerWidth, height: bannerHeight)
let image = UIImage(named: "your_image_name")
let imageView = UIImageView(image: image)
imageView.contentMode = .scaleAspectFit
imageView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
view.addSubview(imageView)
return view
}
The just change titleView
navigationItem.titleView = imageView
What about setting the center of your image equals to the navigationBar.center instead of setting a margin?
//assuming we already have our navigationController
let myNicelLogoWidth = 100
let myNiceLogoHeight = 50
//start positioning your logo at 0.0, 0.0
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: myNicelLogoWidth, height: myNiceLogoHeight))
imageView.contentMode = .scaleAspectFit
imageView.center = navigationBar.center //the put your image at the center
let image = UIImage(named: "myNiceLogoImage")
imageView.image = image
navigationItem.titleView = imageView
I once face with this problem, and finally i found out that the problem is the previous navigation bar title still located next to burger button, but it's invisible.
Fast solution but not sure if it's the best is to change the previous navigation bar title to empty string before show the next view controller.
Hope it's help.
I can set an image to my TableView background, but the image is in the center of the view.
How can I set the image to top ?
I'm using staticTableView
let image = UIImageView(image: UIImage(named: "img.jpg"))
self.settingsTableView.backgroundView = image
self.settingsTableView.backgroundView?.frame = CGRectZero
self.settingsTableView.backgroundView?.contentMode = UIViewContentMode.ScaleAspectFit
If you're using a static table and theres no chance of changing it you might want to take an approach like this:
override func viewDidLoad() {
super.viewDidLoad()
//Create the UIImage
let image = UIImage(named: "testing")
//Create a container view that will take all of the tableView space and contain the imageView on top
let containerView = UIView(frame: CGRect(x: 0.0, y: 0.0, width: self.view.bounds.width, height: self.view.bounds.height))
//Create the UIImageView that will be on top of our table
let imageView = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: self.view.bounds.width, height: image!.size.height))
//Set the image
imageView.image = image
//Clips to bounds so the image doesnt go over the image size
imageView.clipsToBounds = true
//Scale aspect fill so the image doesn't break the aspect ratio to fill in the header (it will zoom)
imageView.contentMode = UIViewContentMode.ScaleAspectFit
containerView.addSubview(imageView)
self.tableView.backgroundView = containerView
}
Make the cells or the headers transparent as you wish. I don't know how your UI should work. This method WON'T scroll the imageView but you can simply do it in the scrollView delegate method. Let me know if you need it to scroll and I'll help you out