ImageFilter

super: Object

An image processor that produces an image by manipulating one or more input images or by generating new image data.

Events

Load() This event is called when the object becames available in the current runtime system.
Unload() This event is called when the object has been removed from the current runtime system (but not yet deallocated).

Class Properties

var categories: List List of available categories.

Properties

var inputKeys: List Returns a list containing the names of all inputs in the filter (read-only)
var outputKeys: List Returns a list containing the names of all outputs in the filter. (read-only)
var attributes: Map Returns a map containing key/value pairs describing the filter. This map contains two kinds of key-value pairs:
- Keys like 'CIAttributeFilterName', 'CIAttributeFilterDisplayName', 'CIAttributeDescription', 'CIAttributeReferenceDocumentation', 'CIAttributeFilterCategories' describe the filter, providing information such as a human-readable name and categories you can use to organize filters in your app’s UI.
- Other keys starting with “input” or “output”, one for each value in inputKeys and outputKeys properties, describe parameters that control the filter’s behavior. For each parameter key, the corresponding value is another dictionary describing possible values for that parameter, such as the value type, class and minimum/maximum values. You can use this information to build a UI to control the filter.
(read-only)
var objectName: String The name of the object.

Class Methods

func filterWithName(name: String): ImageFilter Creates a new filter of type 'name', all input values will be set to default values.
func filterNamesInCategory(category: String): List Returns an array containing all published filter names in a category.
func localizedDescriptionForFilterName(name: String): String Returns the localized description of a filter for display in the UI.

Methods

func setDefaults() Sets all inputs to their default values (where default values are defined, other inputs are left as-is).
func getValue(key: String): Object Get the current value for the property specified by the key. Valid values for the key parameters are listed in the inputKeys and outputKeys properties.
func setValue(value: Object, key: String) Set a new value for the property specified by the key. Valid values for the key parameters are listed in the inputKeys properties.
func outputImage(outputImageClosure: Closure = null, rectToRender: Rect = null, scale: Float = 1, orientation: ImageOrientation = 0): ImageOrientation Executes the filter and produces the rendered image. If the closure parameter is set the execution is performed in a background thread so the UI stays responsive, the methods immediately returns with null value and, when the image is ready, it is passed as the only parameter of the closure; otherwise, the execution is performed in the main thread and the methods returns the resulting image. The optional rectToRender parameter defines the region of the image to render. If not set, the extent of the filtered image is used instead and the image is completely rendered (if the extent of the image is infinite, the rect is too big to be rendered so the resulting image is NULL).

Enums

ImageOrientation

.Down
.DownMirrored
.Left
.LeftMirrored
.Right
.RightMirrored
.Up
.UpMirrored

Examples

Create a filter and apply to an image:

// Create a Bokeh Blur filter
// for the list of filter names please see the Filter Reference
var filterBlur = ImageFilter.filterWithName('CIBokehBlur');

// prepare the completion closure
func completionClosure(image) {
    // Use the filtered image passed as the argument of the closure.
    // For example, set it to the image property of an ImageView
    ImageView1.image = image
}

// The var image is my source Image.
// Apply an array of filters (in this case just my filterBlur).
// The execution is performed in a background thread so the UI stays responsive.
// When the filtered image is ready, the completionClosure is called and the
// filtered image is passed as the only argument of the closure.
image.imageWithFilters([filterBlur], completionClosure)