ActionSheet在iPad上的适配兼容

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兼容适配比较简单，只需要在prenset之前加一个系统校验：

if (UI_USER_INTERFACE_IDIOM()== UIUserInterfaceIdiomPad) {
        if (alertController.popoverPresentationController != nil) {
            alertController.popoverPresentationController.sourceView = self.view;
            alertController.popoverPresentationController.sourceRect = CGRectMake(touchPoint.x, touchPoint.y, 1.0, 1.0);
        }
    }
    
    [self presentViewController:alertController animated:YES completion:nil];