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swiftcgimage

is thread 1: signal SIGABRT always a connection issue (cgimagedestinationfinalize)

Using this block, my App is crashing everytime it tries to 

CGImageDestinationFinalize(gifDest!)

block

func createGIF(with images: [CGImage], data: Data, loopCount: Int, frameDelay: Double) -> Data {
    print("()createGIF.HandHistoryTableVC")
    let gifDest = CGImageDestinationCreateWithData(data as! CFMutableData, kUTTypeGIF, images.count, nil)
    let fileProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: loopCount]]
    CGImageDestinationSetProperties(gifDest!, fileProperties as CFDictionary?)
    let frameProperties = [(kCGImagePropertyGIFDictionary as String): [(kCGImagePropertyGIFDelayTime as String): frameDelay]]
    for img in images {
        CGImageDestinationAddImage(gifDest!, img, frameProperties as CFDictionary?)
    }
    print("GIF in Progress")
    CGImageDestinationFinalize(gifDest!)
    print("gifMade")
    return data;
}

Error Report

enter image description here I'm lost to the reason for this crash. All research about "Thread 1: signal SIGABRT" seems to say it's a connection problem, but my whole App works fine if i comment out the CGImageDestinationFinalize()

Solution 
  • func createGIF(with images: [CGImage], data: CFMutableData, loopCount: Int, frameDelay: Double) -> Data {
    print("()createGIF.HandHistoryTableVC")
    let gifDest = CGImageDestinationCreateWithData(data, kUTTypeGIF, images.count, nil)
    let fileProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: loopCount]]
    CGImageDestinationSetProperties(gifDest!, fileProperties as CFDictionary?)
    let frameProperties = [(kCGImagePropertyGIFDictionary as String): [(kCGImagePropertyGIFDelayTime as String): frameDelay]]
    for img in images {
        CGImageDestinationAddImage(gifDest!, img, frameProperties as CFDictionary?)
    }
    print("GIF in Progress")
    CGImageDestinationFinalize(gifDest!)
    print("gifMade")
    return data as Data;
}

    with CFMutableData initializer

    CFDataCreateMutable(kCFAllocatorDefault, 0)

    solved this issue.