OPPO Ace2 and Apple iPhone 11 both support wireless fast charging technology, but the charging protocol between them is different, so it cannot be directly backcharged.
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The OPPO Ace2 uses VOOC flash charging technology, while the Apple iPhone 11 uses MagSafe wireless charging technology. The charging voltage, current and power parameters between the two technologies are not compatible, so they cannot be directly backcharged.
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If you want to charge an Apple iPhone 11, you can use Apple's official MagSafe charger or a third-party charger that meets its charging standards. Similarly, if you want to charge the OPPO Ace2, you will need to use a charger that is compatible with its charging protocol.