how to support rotate in the textbox created by code?

I created a text box by code in Xcode, by giving

if (isLandScape) {
     textFieldRounded = [[UITextField alloc] initWithFrame:CGRectMake(800, 10, 200, 30)];
 }
 else {
     textFieldRounded = [[UITextField alloc] initWithFrame:CGRectMake(550, 10, 200, 30)];
 }
 

but when rotated, two box are created, I dont want this, what is the treatment for my code?

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