Automatic generation of two-dimensional code with small heads in swift

MARK:-Pass in a string and create a QR code image

Private Func Creatqrcodeimage (text:string, sizeh:cgfloat), uiimage{

Text is the QR code to bring in the information, Sizeh is the height of the two-dimensional code

Creating filters

Let filter = Cifilter (name: "Ciqrcodegenerator")!

To restore the default properties of a filter

Filter.setdefaults ()

Set up data that requires the generation of a two-dimensional code

Filter.setvalue (Text.datausingencoding (nsutf8stringencoding), Forkey: "InputMessage")

Remove the resulting picture from the filter

Let Ciimage = Filter.outputimage

This is a bad definition.

Let Bgimage = UIImage (ciimage:ciimage!)

This is a good definition.

Let Bgimage = Createnoninterpolateduiimageformciimage (ciimage!, Size:sizeh)

Create an Avatar

Let icon = UIImage (named: "Icon")

Composite picture (merge QR code and avatar)

Let NewImage = Creatimage (Bgimage, iconimage:icon!)

Returns the generated QR code.

Return NewImage

}

MARK:-According to the background image and avatar to synthesize the avatar QR Code, that is, the middle with the picture of the two-dimensional code

Private Func Creatimage (Bgimage:uiimage, iconimage:uiimage), uiimage{

Open Picture Context

Uigraphicsbeginimagecontext (Bgimage.size)

Draw a background picture

Bgimage.drawinrect (CGRect (Origin:cgpointzero, size:bgImage.size))

Drawing an Avatar

Let Width:cgfloat = 50

Let Height:cgfloat = width

Let x = (bgimage.size.width-width) * 0.5

Let y = (bgimage.size.height-height) * 0.5

Iconimage.drawinrect (CGRect (x:x, Y:y, Width:width, Height:height))

Take out the drawn picture

Let NewImage = Uigraphicsgetimagefromcurrentimagecontext ()

Close context

Uigraphicsendimagecontext ()

Return to the synthesized picture

Return NewImage

}

MARK:-Generates a specified size of HD uiimage based on Ciimage

Private Func Createnoninterpolateduiimageformciimage (Image:ciimage, size:cgfloat), UIImage {

Let Extent:cgrect = Cgrectintegral (image.extent)

Let scale:cgfloat = min (Size/cgrectgetwidth (extent), size/cgrectgetheight (extent))

Let width = cgrectgetwidth (extent) * scale

Let height = cgrectgetheight (extent) * scale

Let Cs:cgcolorspaceref = Cgcolorspacecreatedevicegray ()!

Let Bitmapref = cgbitmapcontextcreate (nil, int (width), int (height), 8, 0, CS, 0)!

Let context = Cicontext (Options:nil)

Let Bitmapimage:cgimageref = context.createcgimage (image, Fromrect:extent)

Cgcontextsetinterpolationquality (Bitmapref, Cginterpolationquality.none)

CGCONTEXTSCALECTM (bitmapref, scale, scale);

Cgcontextdrawimage (Bitmapref, extent, bitmapImage);

Let Scaledimage:cgimageref = Cgbitmapcontextcreateimage (bitmapref)!

Return UIImage (Cgimage:scaledimage)

}

Automatic generation of two-dimensional code with small heads in swift