There are ways to non-annoyingly ask for a review.

Wait until the user has meaningfully used the app. Don't interrupt the user mid-flow (a banner on the dashboard, a call-to-action on a piece of existing copy) with a modal. Provide a clear "never ask me" option.

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kalleboo 18 hours ago | parent [-]

By App Store rules (5.6.1), you're not allowed to ask for reviews through any method other than the Apple modal dialog. This means you can't make it non-obtrusive or customize to add a "never ask me" option.

	▲	ceejayoz 6 hours ago \| parent [-]
		I tend to doubt they'll reject a subtle "Love our app? We'd love to hear your feedback." that invokes the Apple dialog. I've seen quite a few apps taking such an approach successfully.