如何在按钮上设置自定义指针效果（Objective-C）？

【问题标题】：How to set a custom pointer effect on a button (Objective-C)?如何在按钮上设置自定义指针效果（Objective-C）？
【发布时间】：2020-07-15 22:48:42
【问题描述】：

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 */

【问题讨论】：

标签： ios objective-c pointers

【解决方案1】：

好的，经过反复试验，我想通了！代码如下。

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;
        };

【讨论】：