Function

UIImageJPEGRepresentation(_:_:)

Returns the data for the specified image in JPEG format.

Declaration

func UIImageJPEGRepresentation(_ image: UIImage, _ compressionQuality: CGFloat) -> Data?

Parameters

image

The original image data.

compressionQuality

The quality of the resulting JPEG image, expressed as a value from 0.0 to 1.0. The value 0.0 represents the maximum compression (or lowest quality) while the value 1.0 represents the least compression (or best quality).

Return Value

A data object containing the JPEG data, or nil if there was a problem generating the data. This function may return nil if the image has no data or if the underlying CGImageRef contains data in an unsupported bitmap format.

Discussion

If the image object’s underlying image data has been purged, calling this function forces that data to be reloaded into memory.

See Also

Image Creation

func UIGraphicsBeginImageContext(CGSize)

Creates a bitmap-based graphics context and makes it the current context.

func UIGraphicsGetImageFromCurrentImageContext()

Returns an image based on the contents of the current bitmap-based graphics context.

func UIGraphicsEndImageContext()

Removes the current bitmap-based graphics context from the top of the stack.

func UIImagePNGRepresentation(UIImage)

Returns the data for the specified image in PNG format