ios - stringWithFormat cuts off after %@ -

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i'm new this, have created stringwithformat , tried put 2 variables it, string cuts off after first %@. here's code...

cell.authorview.text = [[nsstring stringwithformat:@"by %@  |  %@", [item author], [item category]]uppercasestring];

i've tried taking out second variable, add after first %@, variable or not, cuts off. doing wrong?

the problem in label, displays text.
1) text can contain \n , label linescount can set 1 (in case first line visible).
2) text can long, , label cuts string.

so problem in label, can check string ok, via

nslog(@"%@", [[nsstring stringwithformat:@"by %@  |  %@", [item author], [item category]]uppercasestring]);

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