Collection element of type 'double' is not an Objective-C object

Question

The inY property gives an error. What is the correct syntax?

UIButton *optionButton = [UIButton buttonWithType:UIButtonTypeCustom];
NSObject* anim = @{@"target": target, @"inY": infoView.frame.size.height-100, @"outY": @800};

Tried creating a variable with it as done with optionButton but it doesn't seem to work. I presume I need to cast it as something the collection can understand.

score 15 · Accepted Answer · answered Mar 31 '14 at 09:30

15

infoView.frame.size.height-100 is a float. You can't cast it, you need to box it in an NSNumber (similar to what you've done with the 800 value for outY):

@(infoView.frame.size.height-100)

answered Mar 31 '14 at 09:30

Wain

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Thanks! was trying with {} but () was exactly what I needed. – springbo Mar 31 '14 at 09:33

score 2 · Answer 2 · edited Mar 31 '14 at 09:46

2

Try [NSNumber numberWithDouble:xxx]

This will then create an Objective-C NSNumber object which contains the double.

edited Mar 31 '14 at 09:46

Wain

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answered Mar 31 '14 at 09:33

Guy Lowe

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`@(xxx)` does exactly the same, and is more modern, concise and readable. – Cyrille Mar 31 '14 at 09:50
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@() @[] @{} @## is the recommended literal syntax that you should use – Oscar Apeland Mar 31 '14 at 10:31

Collection element of type 'double' is not an Objective-C object

2 Answers2