Objective-C: constant string vs dynamic string

Question

I'm trying to combine strings with numbers to load dynamic a texture. I found out that the behavior is different if I use a NSString and assign a static string or I combine the string with a number.

// version 1
NSString* textureName;
textureName = @"texture_1";

// version 2
NSString* textureName;
textureName = [NSString stringWithFormat:@"texture_%i ",index];

When I try to get an item from my dictionary with textureName as my key I get the item with the first version of my code but I dont get it with the second version.

The debugger shows in version 1 the type "_NSCFConstantString" and in version 2 the type "_NSCFString".

How can I get an item out of my dictionary with a dynamic string?

Can you include the code where you define index and where you try to retrieve the value? — jscs
– jscs, Commented Dec 26, 2011 at 19:49
Please show how you retrieve data from dictionary. Also, what is index, where, how is it declared? — James Raitsev
– James Raitsev, Commented Dec 26, 2011 at 19:49

Chuck · Accepted Answer · 2011-12-26 19:50:52Z

3

The problem is that your second string has a space at the end. @"texture_1" is not considered the same as @"texture_1 ".

answered Dec 26, 2011 at 19:50

Chuck

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1 Comment

Skuami Over a year ago

Thank you, obviously I was blind... :-) I thought I am going crazy.

Cyprian · Accepted Answer · 2011-12-26 19:51:39Z

2

This maybe as simple as overlooking a trailing whitespace

Look at the last character in version 2. There is space on the end. Remove it and it should work.

// version 2
NSString* textureName;
textureName = [NSString stringWithFormat:@"texture_%i ",index];

answered Dec 26, 2011 at 19:51

Cyprian

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1 Comment

Skuami Over a year ago

Thank you, obviously I was blind... :-)

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