如何在按鈕上設置自定義指針效果（Objective-C）？

Question

如何在按鈕上設置自定義指針效果（Objective-C）？

backToProjectsButton.pointerInteractionEnabled = YES;
        UITargetedPreview *preview = [[UITargetedPreview alloc] initWithView:backToProjectsButton];
        UIPointerStyle *buttonPointerStyle = [UIPointerStyle styleWithEffect:[UIPointerHighlightEffect effectWithPreview:preview] shape:[UIPointerShape shapeWithRoundedRect:backToProjectsButton.bounds]];
        
        backToProjectsButton.pointerStyleProvider = /* NOT SURE WHAT COMES NEXT */

Answer 1

好的，經過反復試驗，我想通了。 代碼如下。

backToProjectsButton.pointerStyleProvider = ^UIPointerStyle*(UIButton *button, UIPointerEffect *proposedEffect, UIPointerShape *proposedShape){
            CGRect buttonRect = CGRectInset(button.bounds, -12, -14);
            buttonRect = [button convertRect:buttonRect toView:proposedEffect.preview.target.container];
            UIPointerStyle *buttonPointerStyle = [UIPointerStyle styleWithEffect:[UIPointerHighlightEffect effectWithPreview:proposedEffect.preview] shape:[UIPointerShape shapeWithRoundedRect:buttonRect]];
            return buttonPointerStyle;
        };