this is my code given below. what is the solution of expected identifier

You have not set the frame of your text as for the if statement, why it exists is beyond me.
add the Following code:

helloWorldLabel.frame = CGRectMake([X position of top-left corner here], [Y position of top-left corner here], [how wide you want the object to be], [how tall you want the object to be];

For example you you wanted a 300 x 300 box starting at the top left of the screen you would do

helloWorldLabel.frame = CGRectMake( 0, 0, 300, 300);

Hopefully this helps

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