objc struct array to swift array

Question

-(CGPoint*)func
{
    CGPoint* result = calloc(2, sizeof(CGPoint));
    result[0] = ..;
    result[1] = ..;

    return result;
}

how cast this array to swift [CGPoint] ?

Tomas Camin · Accepted Answer · 2015-11-10 09:18:24Z

2

You can use UnsafeBufferPointer to cast it as follows

    let pointer: UnsafeMutablePointer<CGPoint> = yourInstance.func()

    let swiftArray = Array(UnsafeBufferPointer(start: pointer, count: 2))

    free(pointer)

EDIT

If you really need to use C arrays, you may want to rewrite the func method to something like:

- (CGPoint*)pointArray:(NSInteger *)length
{
    int arrSize = 2;
    CGPoint* result = calloc(arrSize, sizeof(CGPoint));
    result[0] = ...
    result[1] = ...

    *length = arrSize;

    return result;
}

Then on the Swift side:

    var arrayLength: Int = 0
    let pointer: UnsafeMutablePointer<CGPoint> = yourInstance.pointArray(&arrayLength)

    let swiftArray = Array(UnsafeBufferPointer(start: pointer, count: arrayLength))

    free(pointer)

edited Nov 10, 2015 at 9:18

answered Nov 10, 2015 at 9:01

Tomas Camin

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2 Comments

nubideus Over a year ago

how i can find length of array?

Tomas Camin Over a year ago

It's a dynamically allocated array, you can't get the length of the array. Pass the length as a parameter of your func() function.

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