How to easily resize/optimize an image size with iOS?

Question

My application is downloading a set of image files from the network, and saving them to the local iPhone disk. Some of those images are pretty big in size (widths larger tha

Answer 1

I just wanted to answer that question for Cocoa Swift programmers. This function returns NSImage with new size. You can use that function like this.

        let sizeChangedImage = changeImageSize(image, ratio: 2)






 // changes image size

    func changeImageSize (image: NSImage, ratio: CGFloat) -> NSImage   {

    // getting the current image size
    let w = image.size.width
    let h = image.size.height

    // calculating new size
    let w_new = w / ratio 
    let h_new = h / ratio 

    // creating size constant
    let newSize = CGSizeMake(w_new ,h_new)

    //creating rect
    let rect  = NSMakeRect(0, 0, w_new, h_new)

    // creating a image context with new size
    let newImage = NSImage.init(size:newSize)



    newImage.lockFocus()

        // drawing image with new size in context
        image.drawInRect(rect)

    newImage.unlockFocus()


    return newImage

}