ShapedButton is a UIButton subclass optimized for non-rectangular button shapes written in Swift. ShapedButton respond to touches only in areas where the flattened button image (background image + image + title label) for state .Normal is non-transparent. This implementation is based on OBShapedButton by Ole Begemann (https://github.com/ole/OBSh…

ShapedButton.swift

//
//  ShapedButton.swift
//
//
//  Created by clmntcrl on 16/09/2014.
//  Copyright (c) 2014 clmntcrl. All rights reserved.
//

import UIKit

class ShapedButton: UIButton {

    override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool {
        if !super.pointInside(point, withEvent: event) {
            return false
        }

        UIGraphicsBeginImageContext(bounds.size)
        layer.renderInContext(UIGraphicsGetCurrentContext())
        let image = UIGraphicsGetImageFromCurrentImageContext()

        // ↓ cf. UIImage+ColorAtPixel from https://github.com/ole/OBShapedButton

        let pointX = trunc(point.x)
        let pointY = trunc(point.y)
        let cgImage = image.CGImage
        let width = image.size.width
        let height = image.size.height
        var pixelData: [CUnsignedChar]  = [0, 0, 0, 0]
        let bytesPerPixel: UInt = 4
        let bytesPerRow: UInt = bytesPerPixel * 1
        let bitsPerComponent: UInt = 8
        let colorSpace = CGColorSpaceCreateDeviceRGB()
        let bitmapInfo = CGBitmapInfo.ByteOrder32Big | CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
        let context = CGBitmapContextCreate(&pixelData, 1, 1, bitsPerComponent, bytesPerRow, colorSpace, bitmapInfo)
        CGContextSetBlendMode(context, kCGBlendModeCopy)

        CGContextTranslateCTM(context, -pointX, pointY - height)
        CGContextDrawImage(context, CGRectMake(0.0, 0.0, width, height), cgImage)

//        let r = CGFloat(pixelData[0]) / 255.0
//        let g = CGFloat(pixelData[1]) / 255.0
//        let b = CGFloat(pixelData[2]) / 255.0
        let a = CGFloat(pixelData[3]) / 255.0

        return a != 0.0
    }

}

I got this
Cannot invoke 'CGBitmapContextCreate' with an argument list of type '(inout [CUnsignedChar], Int, Int, UInt, UInt, CGColorSpace!, CGBitmapInfo)'

Updated it for Swift 2.0 with following code. Seems to work fine so far but you might wanna check!
Thanks!

var pixelData: [CUnsignedChar] = [0, 0, 0, 0]
let bytesPerPixel = 4
let bytesPerRow = bytesPerPixel * 1
let bitsPerComponent = 8
let colorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue | CGBitmapInfo.ByteOrder32Little.rawValue)
let context = CGBitmapContextCreate(&pixelData, 1, 1, bitsPerComponent, bytesPerRow, colorSpace, bitmapInfo.rawValue)
CGContextSetBlendMode(context, CGBlendMode.Copy)

Hi, for some reason I get memory error when using this. I have a function that adds 10 buttons with pngs as backgrounds but everytime I click one of the buttons it adds to the memorybuffer an after about 10 clicks the app crash due to memory issues. Do you know what could cause this?

Will this be updated for Swift 3? I'm having trouble getting it functioning.

Is anyone working on swift 3 for this?

Hi All, Here is it in Swift 3 .
https://gist.github.com/rizvvan/d6def79882bda9f916463b2feaeaf64a