UIBlurEffect is always nil

Question

I've been trying to add a blur effect to my app and upon debugging it using breakpoints, the UIBlurEffect variable is always nil.

Following is the code I am using:

UIBlurEffect *effect = [[UIBlurEffect alloc] init];
effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView *bluredView = [[UIVisualEffectView alloc] initWithEffect: effect];
bluredView.frame = self.view.bounds;
[self.view addSubview:bluredView];

I have tried a couple different things, for example instead of alloc and init UIBlurEffect, directly using it as follows:

UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];

It is still always set to nil. Is there an import I'm missing? I have imported UIKit in my .h file but 'effect' is always nil for some reason.

If anyone has experience the same, I would really appreciate it if you could share your experience.

Any help on the matter would be great! Thanks in advance!

Did you assume it is nil, because you cannot see it or how do you detect it? — Simon Degn, Jul 13 '15 at 23:46
Sorry, I guess I should've mentioned this more clearly. I set the breakpoint at the line: [self.view addSubview:bluredView]; and saw that bluredView was nil. So I set a breakpoint at: UIVisualEffectView *bluredView = [[UIVisualEffectView alloc] initWithEffect: effect]; and saw that effect was nil — Aashay, Jul 14 '15 at 00:57
Set the breakpoint at a line under the actual line. The break point stops the code before running the line it's on which means that the `UIVisualEffectView *bluredView = [[UIVisualEffectView alloc] initWithEffect: effect];` isn't declared when you test the value. Set the breakpoint below and hold your mouse over the line you want to check. — Simon Degn, Jul 14 '15 at 02:22

score 0 · Accepted Answer · answered Jul 14 '15 at 01:19

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Are you running on iOS 7? UIBlurEffect is only available on iOS 8 and above.

answered Jul 14 '15 at 01:19

Ewan Mellor

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Thank you so much for you response. It indeed was the version issue. – Aashay Jul 14 '15 at 09:40
You're welcome, @aashay. Please accept an answer here to close the question. – Ewan Mellor Jul 14 '15 at 17:39

score 0 · Answer 2 · answered Jul 14 '15 at 01:37

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These two Gits may help you, even I firstly didn't see they use UIBlurImage. Try them :)

LBBlurredImage

BTGlassScrollView

answered Jul 14 '15 at 01:37

BlueBookBi.

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Thank you for your response. I will check the Gits out. In my current case, as @EwamMellor pointed out, the devices it was showing nil on is running iOS. – Aashay Jul 14 '15 at 09:40

UIBlurEffect is always nil

2 Answers2