_backView.layer.shadowColor=UIColor.greenColor.CGColor;_backView.layer.borderColor=_backView.layer.shadowColor;// 边框颜色建议和阴影颜色一致_backView.layer.borderWidth=0.000001;// 只要不为0就行_backView.layer.cornerRadius=40;_backView.layer.shadowOpacity=1;_backView.layer.shadowRadius=20;_backView.layer.shadowOffset=CGSizeZero;
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