How do I add boarder like in the below image (in Objective-C ) to UIImageView. I tried using UIBezierPath but wasn't successful.
Create a UIView (square in dimensions), add corner radius = 1/2 times its side.
Now add the UIImageView as a subview to this UIView.
As the image is circular in shape, so a simpler appraoch to the solution to your problem is to add corner radius to your UIVIew.
Below is the code I used:
let circleView: UIView = UIView(frame: CGRect(x: 0,
y: 0,
width: 100,
height: 100))
circleView.center = view.center
circleView.backgroundColor = .lightGray
circleView.layer.cornerRadius = 50
view.addSubview(circleView)
let imageView: UIImageView = UIImageView(frame: CGRect(x: 0,
y: 0,
width: 100,
height: 100))
imageView.image = UIImage(named: "F8FIs.png")
circleView.addSubview(imageView)
Please note that I added lightGray color to circle view for clarity.
And here is the screenshot of how it looks:
Related
I want to crop out a portion of a view. I followed this article: "How to mask one UIView using another UIView", and this is my code currently:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
/// show a green border around the image view's original frame
let backgroundView = UIView(frame: CGRect(x: 50, y: 50, width: 200, height: 300))
backgroundView.layer.borderColor = UIColor.green.cgColor
backgroundView.layer.borderWidth = 4
view.addSubview(backgroundView)
let imageView = UIImageView(frame: CGRect(x: 50, y: 50, width: 200, height: 300))
imageView.image = UIImage(named: "TestImage")
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
view.addSubview(imageView)
// MARK: - Mask code
let maskView = UIView(frame: CGRect(x: 80, y: 100, width: 100, height: 100))
maskView.backgroundColor = .blue /// ensure opaque
view.addSubview(maskView)
imageView.mask = maskView
}
}
The mask is working fine:
Without mask
With mask
However, I want the parts of the image view that are cropped out to still be there, but just have a lower alpha. This is what it should look like:
I've tried changing maskView.alpha to 0.25, but that just makes the part with the mask be less opaque.
How can I make the cropped-out parts still be there, but just a bit more transparent?
Preferably I don't want to make another view, because eventually I'll be using this on a camera preview layer — an extra view might have a cost on performance.
Edit: matt's answer
I tried adding a subview with a background color with less alpha:
let maskView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 300))
maskView.backgroundColor = UIColor.blue.withAlphaComponent(0.3)
let maskView2 = UIView(frame: CGRect(x: 80, y: 100, width: 100, height: 100))
maskView2.backgroundColor = UIColor.blue.withAlphaComponent(1)
maskView2.alpha = 0
maskView.addSubview(maskView2)
imageView.mask = maskView
But this is the result:
It’s all in the transparency of the colors you paint the mask with. (The hues — what we usually think of as color — are irrelevant.) The masking depends upon the degree of transparency. Areas of the mask that are partially transparent will make the masked view be partially transparent.
So make the mask the whole size of the target view, and make the whole mask a partially transparent color, except for the central area which is an opaque color.
I have attached the image. I want create corner radius of UIView. Please look image https://i.stack.imgur.com/AkUuO.png
Hope this helps:
let redBox = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
redBox.backgroundColor = .red
redBox.layer.cornerRadius = 25
redBox.layer.maskedCorners = [.layerMaxXMaxYCorner]
Looks like a similar question asked here: How to set cornerRadius for only top-left and top-right corner of a UIView?
I have an UIView in which I want to create a hole in the shape of the content of a UIImageView, but I can't get it to work. I can, however, mask an UIView to the shape of the UIImage.
My code:
let doorsMaskBounds = CGRect(x: 0, y: 0, width: 111, height: 111)
// Background view
let doorsBgView = UIView(frame: doorsMaskBounds)
doorsBgView.center = navigationController.view.center
doorsBgView.backgroundColor = UIColor.yellow
vc.view.addSubview(doorsBgView)
vc.view.bringSubview(toFront: doorsBgView)
// Logo Mask
doorsBgView.layer.mask = CALayer()
doorsBgView.layer.mask?.contents = UIImage(named: "doors")!.cgImage
doorsBgView.layer.mask?.bounds = doorsMaskBounds
doorsBgView.layer.mask?.anchorPoint = CGPoint(x: 0.5, y: 0.5)
doorsBgView.layer.mask?.position = CGPoint(x: doorsBgView.frame.width / 2, y: doorsBgView.frame.height / 2)
which results into:
I know how to "cut" a hole into a UIView in form of a shape I draw myself, as explained here, I just can't seem to figure out how the get the shape of the UIImage and apply it as the cut.
I have a UIView that holds a UILabel inside.
After applying affine transform on the UIView using:
myView.transform = CGAffineTransformMakeScale(4, 4);
My UILabel (which is a sub view to myView) grows as well.
Is there a way to prevent this?
i tried:
1) Using the CGAffineTransformIdentity flag on the label.
2) Adding a superview to myView and adding myView as superview's subview, and the label as a subview to the superview (and not myView).
Non of them seem to be working, the label keeps growing.
Any ideas?
You answered your own question with option 2. Not sure why it's not working since you did not supply any code. The playground code below shows it will work. Uncomment out the last line to transform the subview but not the label.
import UIKit
import XCPlayground
let superview = UIView(frame: CGRect(x: 10, y: 10, width: 200, height: 200))
XCPlaygroundPage.currentPage.liveView = superview
superview.backgroundColor = UIColor.redColor()
let view = UIView(frame: CGRect(x: 10, y: 10, width: 100, height: 100))
view.backgroundColor = UIColor.greenColor()
superview.addSubview(view)
let label = UILabel(frame: CGRect(x: 20, y: 10, width: 40, height: 40))
label.text = "Hello"
superview.addSubview(label)
//view.transform = CGAffineTransformMakeScale(2, 2)
I have a superview which contains a ImageView, a testView, and some buttons. I created a UIView which contains ImageView2 and a removebutton.
When I add UIView to UIImageView, the contents of UIView are not in the frame of UIView. Because of that, I cannot apply pan gesture recognizer.
I have tried to apply constraints and to change the frame and centre of ImageView2.
Below is the code I am using to create the above mentioned UIView. How do I ensure that the contents of the UIView are visible in the frame of the UIView?
let rect = CGRect(x: self.imageView.center.x-30, y: self.imageView.center.y-30, width: 80, height: 80)
testview = UIView(frame: rect)
testview.layer.cornerRadius = testview.frame.width/2
testview.backgroundColor = UIColor.blackColor()
testview.clipsToBounds = true
imageView2 = UIImageView(frame: CGRect(x: testview.frame.minX+10, y: testview.frame.minY+10, width: 60, height: 60))
let rect2 = CGRect(x: self.testview.frame.maxX-17, y: self.testview.frame.minY, width: 20, height: 20)
removeButton = UIButton(frame: rect2)
removeButton.layer.cornerRadius = removeButton.frame.width/2
removeButton.backgroundColor = UIColor.blackColor()
removeButton.clipsToBounds = true
imageView2.layer.cornerRadius = imageView2.frame.width/2
imageView2.userInteractionEnabled = true
imageView2.clipsToBounds = true
testview.alpha = 0.3
imageView2.center = testview.center
imageView2.center = testview.center
testview.addSubview(imageView2)
testview.addSubview(removeButton)
testview.bringSubviewToFront(imageView2)
imageView.addSubview(testview)
The problem is that lines like this do not do what you think:
let rect = CGRect(x: self.imageView.center.x-30, y: self.imageView.center.y-30, width: 80, height: 80)
// ... and ...
imageView2.center = testview.center
The center of a view is in its frame coordinates - it has to do with how the view is placed in its superview. But the position of a subview must be described in terms of its superviews bounds, not its frame. Its bounds are its internal coordinates, which is what you want.
Let's take the simplest case: how to center a subview in a superview. This is not the way:
imageView2.center = testview.center
You see the problem? testview.center is where testview is located in its superview; it is not the internal center of testview, which is what you want. The internal center of testview comes from its bounds. This is the way:
let c = CGPointMake(testview.bounds.midX, testview.bounds.midY)
imageView2.center = c