I have a navigation bar that currently only has a back button. I am trying to add an image button on the right side of the navigation bar but the image I am using is larger than the navigation bar and ends up covering the back button and gets positioned strangely.
This is the code:
let mapBtn = UIButton(type: .system)
mapBtn.setImage(#imageLiteral(resourceName: "map-1"), for: .normal)
mapBtn.frame = CGRect(x: 0,y: 0,width: 5,height: 5)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: mapBtn)
This is an image of what is happening:
https://imgur.com/a/kzcwbGK
Is there anyway to add a constraint to the mapBtn to make it stick to the right side as it should be?
Try to resize your image
func resizeImage(image: UIImage, targetSize: CGSize) -> UIImage? {
let size = image.size
let widthRatio = targetSize.width / image.size.width
let heightRatio = targetSize.height / image.size.height
// Figure out what our orientation is, and use that to form the rectangle
var newSize: CGSize
if(widthRatio > heightRatio) {
newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
} else {
newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
}
// This is the rect that we've calculated out and this is what is actually used below
let rect = CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height)
// Actually do the resizing to the rect using the ImageContext stuff
UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
image.draw(in: rect)
if let newImage = UIGraphicsGetImageFromCurrentImageContext(){
UIGraphicsEndImageContext()
return newImage
}else{
return nil
}
}
let mapBtn = UIButton(type: .system)
let img = UIImage(named: "map-1")
let resizedImage = resizeImage(image: img, targetSize: CGSize(width: 5.0, height: 5.0)
mapBtn.frame = CGRect(x: 0,y: 0,width: 5,height: 5)
mapBtn.setImage(resizedImage, for: .normal)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: mapBtn)
set this.
mapBtn.imageView?.contentMode = .scaleAspectFit
Related
I'm new to this topic so I want to ask how I can achieve this following behavior: I would like to create a image with a specific size. If the original Image doesn't fit in a square I would like to fill the sides with a color, so I want to draw that image in a rectangle with a color and want to store it in a new UIImage variable.
To resize a Image I found something like this. But how can I fit the image in a Rectangle with a specific color and create a new Image that can be stored?
UIGraphicsBeginImageContextWithOptions(size, false, self.scale)
defer { UIGraphicsEndImageContext() }
draw(in: CGRect(x: 0.0, y: 0.0, width: size.width, height: size.height))
return UIGraphicsGetImageFromCurrentImageContext()
One possible way would be to create an extension method to UIImage as you started in your sample code.
Then create a new image of the desired size and fill the background color with UIRectFill.
The next step would be to calculate the new size so that the image content is scaled to fit into the image by taking the aspect ratio into account:
let scale = min(size.width / originalSize.width, size.height / originalSize.height)
let newSize = CGSize(width: originalSize.width * scale, height: originalSize.height * scale)
let origin = CGPoint(x: (size.width - newSize.width) / 2, y: (size.height - newSize.height) / 2)
Then you basically just need to draw the image into the rectangle that results from the origin and the actual size of the image inside the background area.
Completely, the extension method could then look something like this:
func image(size: CGSize, background: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, self.scale)
defer { UIGraphicsEndImageContext() }
background.setFill()
let completeRect = CGRect(origin: .zero, size: size)
UIRectFill(completeRect)
let originalSize = self.size
let scale = min(size.width / originalSize.width, size.height / originalSize.height)
let newSize = CGSize(width: originalSize.width * scale, height: originalSize.height * scale)
let origin = CGPoint(x: (size.width - newSize.width) / 2, y: (size.height - newSize.height) / 2)
let imageRect = CGRect(origin: origin, size: newSize)
draw(in: imageRect, blendMode: .normal, alpha: 1.0)
return UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
}
Self-Contained Complete Example
Finally a self-contained complete example for testing:
import UIKit
class ViewController: UIViewController {
private let image1 = UIImage(named: "country")
private let image2 = UIImage(named: "regensburg")
override func viewDidLoad() {
super.viewDidLoad()
let imageView1 = createImageView()
imageView1.image = image1?.image(size: CGSize(width: 200, height: 200), background: .blue)
let imageView2 = createImageView()
imageView2.image = image2?.image(size: CGSize(width: 200, height: 200), background: .blue)
NSLayoutConstraint.activate([
imageView1.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 24),
imageView1.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 24),
imageView1.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -24),
imageView2.topAnchor.constraint(equalTo: imageView1.bottomAnchor, constant: 24),
imageView2.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 24),
imageView2.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -24),
imageView2.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -24),
imageView2.widthAnchor.constraint(equalTo: imageView1.widthAnchor),
imageView2.heightAnchor.constraint(equalTo: imageView1.heightAnchor)
])
}
private func createImageView() -> UIImageView {
let imageView = UIImageView()
imageView.contentMode = .scaleAspectFit
imageView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(imageView)
return imageView
}
}
extension UIImage {
func image(size: CGSize, background: UIColor) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, self.scale)
defer { UIGraphicsEndImageContext() }
background.setFill()
let completeRect = CGRect(origin: .zero, size: size)
UIRectFill(completeRect)
let originalSize = self.size
let scale = min(size.width / originalSize.width, size.height / originalSize.height)
let newSize = CGSize(width: originalSize.width * scale, height: originalSize.height * scale)
let origin = CGPoint(x: (size.width - newSize.width) / 2, y: (size.height - newSize.height) / 2)
let imageRect = CGRect(origin: origin, size: newSize)
draw(in: imageRect, blendMode: .normal, alpha: 1.0)
return UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
}
}
The output of the above code is then:
The specified actual image size is square. Accordingly, there are corresponding vertical or horizontal stripes at the edges of the image in the selected background color (blue).
I cant set my UIImageView as half size of my tableview.backgroundview in upper part of my controller.
i tried to set origin of avatar as origin view, but it doesnt work.
let avatar = UIImageView(frame: self.view.frame)
let imgageOfAvatar = UIImage(named: "avatar.jpg")
avatar.image = imgageOfAvatar
avatar.frame = CGRect(x: self.view.frame.origin, y: self.view.frame.origin , width: self.view.frame.width, height: self.view.frame.height / 2)
avatar.frame.origin = self.view.frame.origin
//avatar.contentMode = UIViewContentMode.scaleAspectFill
self.tableView.addSubview(avatar)
self.tableView.sendSubview(toBack: avatar)
https://pp.userapi.com/c847120/v847120175/19f9cf/128kU2yWq-E.jpg
Try this
avatar.frame.origin.x = self.view.frame.origin.x
avatar.frame.origin.y = self.view.frame.origin.y
avatar.frame = CGRect(origin:self.view.frame.origin, size: width: self.view.frame.width, height: self.view.frame.height / 2)
you should add it to view like this:
let avatar = UIImageView(frame: self.view.frame)
let imgageOfAvatar = UIImage(named: "avatar.jpg")
avatar.image = imgageOfAvatar
avatar.frame = CGRect(x: self.view.frame.origin.x, y: self.view.frame.origin.y , width: self.view.frame.width, height: self.view.frame.height / 2)
avatar.frame.origin = self.view.frame.origin
self.view.insertSubview(avatar, at: 0)
I got the intended result
output
let avatar = UIImageView(frame: self.view.frame)
let imgageOfAvatar = UIImage(named: "dog.jpeg")
avatar.image = imgageOfAvatar
avatar.frame = CGRect(origin: self.view.frame.origin,
size: CGSize(width: self.view.frame.width,
height: self.view.frame.height / 2))
self.tableview.addSubview(avatar)
self.tableview.sendSubviewToBack(avatar)
I am trying to change the square crop tool to circular one for the images selected from Photo Library in Swift 4. I tried many old codes available in here with no luck. Can somebody please help me.
There are mainly 2 issues in this code.
It doesn't hide the already existing square cropping area.
It shows the choose and cancel buttons under the old overlay, so cant tap on it.
Any help would be appreciated.
My code:
private func hideDefaultEditOverlay(view: UIView)
{
for subview in view.subviews
{
if let cropOverlay = NSClassFromString("PLCropOverlayCropView")
{
if subview.isKind(of: cropOverlay) {
subview.isHidden = true
break
}
else {
hideDefaultEditOverlay(view: subview)
}
}
}
}
private func addCircleOverlayToImageViewer(viewController: UIViewController) {
let circleColor = UIColor.clear
let maskColor = UIColor.black.withAlphaComponent(0.8)
let screenHeight = UIScreen.main.bounds.size.height
let screenWidth = UIScreen.main.bounds.size.width
hideDefaultEditOverlay(view: viewController.view)
let circleLayer = CAShapeLayer()
let circlePath = UIBezierPath(ovalIn: CGRect(x: 0, y: screenHeight - screenWidth, width: screenWidth, height: screenWidth))
circlePath.usesEvenOddFillRule = true
circleLayer.path = circlePath.cgPath
circleLayer.fillColor = circleColor.cgColor
let maskPath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight), cornerRadius: 0)
maskPath.append(circlePath)
maskPath.usesEvenOddFillRule = true
let maskLayer = CAShapeLayer()
maskLayer.path = maskPath.cgPath
maskLayer.fillRule = kCAFillRuleEvenOdd
maskLayer.fillColor = maskColor.cgColor
viewController.view.layer.addSublayer(maskLayer)
// Move and Scale label
let label = UILabel(frame: CGRect(x: 0, y: 20, width: view.frame.width, height: 50))
label.text = "Move and Scale"
label.textAlignment = .center
label.textColor = UIColor.white
viewController.view.addSubview(label)
}
I have an image in a UIImageView:
imageView.contentMode = .scaleAspectFit
imageView.backgroundColor = .red
because of .scaleAspectFit the image view has some red borders and thats OK:
User can added some UIView like label or images over the imageView.
In final step I used the following code to save edited image and user can share it or save it to photo library:
private func generateImage() -> UIImage? {
var finalImage: UIImage?
UIGraphicsBeginImageContextWithOptions(CGSize(width: imageView.frame.size.width, height: imageView.frame.size.height), true, 0)
imageView.drawHierarchy(in: CGRect(x: 0, y: 0, width: imageView.frame.size.width, height: imageView.frame.size.height), afterScreenUpdates: true)
finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
The problem is that the finalImage still has the red borders from imageView.
You can get CGRect of the UIImage displayed in the UIImageView in AspectFit content mode. Please create extension of UIImageView like this,
extension UIImageView {
var contentClippingRect: CGRect {
guard let image = image else { return bounds }
guard contentMode == .scaleAspectFit else { return bounds }
guard image.size.width > 0 && image.size.height > 0 else { return bounds }
let scale: CGFloat
if image.size.width > image.size.height {
scale = bounds.width / image.size.width
} else {
scale = bounds.height / image.size.height
}
let size = CGSize(width: image.size.width * scale, height: image.size.height * scale)
let x = (bounds.width - size.width) / 2.0
let y = (bounds.height - size.height) / 2.0
return CGRect(x: x, y: y, width: size.width, height: size.height)
}
}
You can now use imageView.contentClippingRect to read how read the position and size of the image inside.
You have to do minor changes in your method, call your function with appropriate bounds as contentClippingRect.
Let me know in case of any queries.
UPDATE
Please try this UIImageView+Extension, this might help you. It is in Objective-C code, convert it in Swift.
You can try this as well,
let image = #imageLiteral(resourceName: "Cat03")
let x: CGRect = AVMakeRect(aspectRatio: image.size, insideRect: imageView1.frame)
print(x)
Above code gives you size perfectly.
I want to create something like image as below
could you help me any code how to make it rounded
thanks for your help!
I think you need to
(Optional) Resize the image if image is bigger than standard bar button image size)
Make the image round
before using it as UItabBarItem image. Below is an extension for UIImage with these two functions:
extension UIImage{
var roundedImage: UIImage {
let rect = CGRect(origin:CGPoint(x: 0, y: 0), size: self.size)
UIGraphicsBeginImageContextWithOptions(self.size, false, 1)
UIBezierPath(
roundedRect: rect,
cornerRadius: self.size.height
).addClip()
self.draw(in: rect)
return UIGraphicsGetImageFromCurrentImageContext()!
}
func resizedImage(newWidth: CGFloat) -> UIImage {
let scale = newWidth / self.size.width
let newHeight = self.size.height * scale
UIGraphicsBeginImageContext(CGSize(width: newWidth, height: newHeight))
self.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
}
Example usage:
let barImage: UIImage = UIImage(named: "avatar_copy.png")!.resizedImage(newWidth: 40).roundedImage.withRenderingMode(.alwaysOriginal)
let roundTabBar = UITabBarItem(title: nil, image: barImage.withRenderingMode(.alwaysOriginal), selectedImage: barImage)
self.bottomTabbar.items = [roundTabBar]
I changed and added a new function to #firstinq answer. And this way works for me.
extension UIImage{
var roundMyImage: UIImage {
let rect = CGRect(origin:CGPoint(x: 0, y: 0), size: self.size)
UIGraphicsBeginImageContextWithOptions(self.size, false, 1)
UIBezierPath(
roundedRect: rect,
cornerRadius: self.size.height
).addClip()
self.draw(in: rect)
return UIGraphicsGetImageFromCurrentImageContext()!
}
func resizeMyImage(newWidth: CGFloat) -> UIImage {
let scale = newWidth / self.size.width
let newHeight = self.size.height * scale
UIGraphicsBeginImageContext(CGSize(width: newWidth, height: newHeight))
self.draw(in: CGRect(x: 0, y: 0, width: newWidth, height: newHeight))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
func squareMyImage() -> UIImage {
UIGraphicsBeginImageContext(CGSize(width: self.size.width, height: self.size.width))
self.draw(in: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.width))
let newImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return newImage!
}
}
In TabBarController I changed it to:
let barImage: UIImage = UIImage(named: "landingpage_image2")!.squareMyImage().resizeMyImage(newWidth: 40).roundMyImage.withRenderingMode(.alwaysOriginal)
self.tabBar.items?[1].image = barImage
let profileImg : UIImageView = {
let iv = UIImageView()
iv.translatesAutoresizingMaskIntoConstraints = false
iv.contentMode = .scaleAspectFill
iv.image = #imageLiteral(resourceName: "user")
iv.clipsToBounds = true
iv.layer.cornerRadius = 25
return iv
}()
// add constraint
override func viewDidLoad() {
super.viewDidLoad()
profileImg.leftAnchor.constraint(equalTo: view.leftAnchor, constant : 8).isActive = true
profileImg.topAnchor.constraint(equalTo: view.topAnchor , constant : 8).isActive = true
profileImg.widthAnchor.constraint(equalToConstant: 50).isActive = true
profileImg.heightAnchor.constraint(equalToConstant: 50).isActive = true
}