How to add a custom shape to an UIImageView in Swift? - ios

Question

I'm trying to add a custom shape to an imageView. Please check the below images.
This is the required one:
This is what I have done so far:
I'm new to Core Graphics and I have done this so far:
private func customImageClipper(imageV: UIImageView){
let path = UIBezierPath()
let size = imageV.frame.size
print(size)
path.move(to: CGPoint(x: 0.0, y: size.height))
path.addLine(to: CGPoint(x: 0.8, y: size.height/2))
path.close()
let shape = CAShapeLayer()
shape.path = path.cgPath
imageV.layer.sublayers = [shape]
}
I'm creating a function to achieve a shape like this, but whenever I pass the imageView into this function, I can not see any change at all. I know that I have to move from points to another point to achieve this shape, but I have never done this. Any help would be appreciated. This is how I'm calling this function:
imageV.layoutIfNeeded()
customImageClipper(imageV: imageV)
P.S.: I'm not using Storyboard, I have created this programmatically.

Answer 1

There are many ways to create shapes using UIBezierPaths. This post here discusses the use of the draw function to create a shape.
Here is an example using your clip function within the cell.
func clip(imageView: UIView, withOffset offset: CGFloat) {
let path = UIBezierPath()
//Move to Top Left
path.move(to: .init(x: imageView.bounds.size.width * offset, y: 0))
//Draw line from Top Left to Top Right
path.addLine(to: .init(x: imageView.bounds.size.width, y: 0))
//Draw Line from Top Right to Bottom Right
path.addLine(to: .init(x: imageView.bounds.size.width * (1 - offset), y: imageView.bounds.size.height))
//Draw Line from Bottom Right to Bottom Left
path.addLine(to: .init(x: 0, y: imageView.bounds.size.height))
//Close Path
path.close()
//Create the Shape Mask for the ImageView
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
shapeLayer.fillColor = UIColor.black.cgColor
imageView.layer.mask = shapeLayer
}
In this function, the offset is the amount of angle you would like on the shape, ranging from 0 to 1. (0.4) seems to work for your requirements.
This shares a lot of similarities with Apseri's answer, except I chose the route of percentages, rather than exact size. Nothing wrong with either approach, I just found it easier to understand with percentages. :)
One last note to point out, I used this function in the layoutSubviews function.
override func layoutSubviews() {
super.layoutSubviews()
imageView.layoutIfNeeded()
clip(imageView: self.imageView, withOffset: 0.4)
}
This output the following image:
Hope this helps.

Answer 2

Here is example of some path clipping. Of course path can be also put via parameters, and this can be applied to any view, as shown.
Before:
After (grey background is below ScrollView background):
func customImageClipper(imageV: UIView){
let path = UIBezierPath()
let size = imageV.frame.size
path.move(to: CGPoint(x: size.width/3.0, y: 0))
path.addLine(to: CGPoint(x: size.width/3.0 + 50, y: 0))
path.addLine(to: CGPoint(x: size.width/3.0, y: size.height))
path.addLine(to: CGPoint(x: size.width/3.0 - 50, y: size.height))
path.addLine(to: CGPoint(x: size.width/3.0, y: 0))
path.close()
let shape = CAShapeLayer()
shape.path = path.cgPath
shape.fillColor = UIColor.black.cgColor
imageV.layer.mask = shape
}

Answer 3

1- Subclassing your UIImageView
2- implement your custom drawings inside setNeedsLayout using UIBezierPath
class MyCustomImageView: UIImageView {
override func setNeedsLayout() {
let path = UIBezierPath()
path.moveToPoint(CGPoint(x: self.frame.size.width/2, y: self.frame.size.height))
path.addLineToPoint(CGPoint(x: self.frame.size.width, y: self.frame.size.height/2))
path.addLineToPoint(CGPoint(x: self.frame.size.width/2, y: 0))
path.addArcWithCenter(CGPoint(x: self.frame.size.width/2, y: self.frame.size.height/2), radius: self.frame.size.width/2, startAngle:-CGFloat(M_PI_2), endAngle: CGFloat(M_PI_2), clockwise: false)
path.moveToPoint(CGPoint(x: self.frame.size.width/2, y: self.frame.size.height))
path.closePath()
UIColor.redColor().setFill()
path.stroke()
path.bezierPathByReversingPath()
let shapeLayer = CAShapeLayer()
shapeLayer.frame = self.bounds
shapeLayer.path = path.CGPath
shapeLayer.fillColor = UIColor.redColor().CGColor
self.layer.mask = shapeLayer;
self.layer.masksToBounds = true;
}
}