How to add CIFilter to CALayer

Question

I am new to core animation , i add some layers to my view and add image to it. Now i want to give blur effect to my layer

But i don't know how to make CIFilter and add it. I go through the related questions Question 1 Question2

My code is given below (Shows compilation error)

#import < UIKit/UIKit.h >
#import < QuartzCore/QuartzCore.h >
#import < CoreGraphics/CoreGraphics.h >


@interface T_CALayerPart3_View : UIView {

    CALayer *_layer1;
    CALayer *_layer2;
    CALayer *_layer3;
    CALayer *_layer4;
    CALayer *_layer5;
    CIFilter *_filter;    //<----- error here[Expected specifier -qualifier -list before CIFilter]

    CATransform3D *_rotate, *_scale;

}
@end

Give me some suggestion. Your suggestion is important to me. Don't leave the page without any Answer/ comment.

[sorry for my poor English]

score 8 · Accepted Answer · edited May 23 '17 at 12:01

8

There is no CIFilter in iPhone OS. There is CAFilter but it is a private API so using it on AppStore apps means rejection. If you already know what images you will use, you could create the blurred image in the first place.

See How to implement a box or gaussian blur on iPhone on how to implement a Gaussian blur filter "legally".

See CAFilter — iPhone Development Wiki on how to apply a blur filter on a CALayer using the private CAFilter class.

edited May 23 '17 at 12:01

Community

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answered Sep 17 '10 at 17:36

kennytm

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As per your second answer(Wiki) , when i am trying to make an object of CAFilter [CAFilter *_filter ; ] it shows same error . – new_programmer Sep 17 '10 at 17:42
@new: You need to declare CAFilter yourself how it is a "private API™". – kennytm Sep 17 '10 at 17:48
@Kenny Can you explain it, [declaring CAFilter]. – new_programmer Sep 17 '10 at 17:54
2

@new: That means you need to add a `@interface CAFilter : NSObject @end` to the file you're going to use. – kennytm Sep 17 '10 at 17:56
Thank you for your nice reply. Its its my first time to get a reply like this. – new_programmer Sep 17 '10 at 18:10
Anyones app been removed from the app store for using CAFilter? – Daniel Ryan Jan 19 '12 at 00:22

How to add CIFilter to CALayer

1 Answers1