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ios - 如何从 UIButton 控件中删除尖锐的矩形边缘?

请看下图:如您所见,边缘是尖锐的矩形,它们从圆角按钮中出来。我怎么能不显示边缘而只显示圆形按钮?更新(解决方案):我用下面的代码来实现圆角:UIBezierPath*maskPath=[UIBezierPathbezierPathWithRoundedRect:self.stopButton.boundsbyRoundingCorners:UIRectCornerAllCornerscornerRadii:CGSizeMake(12.0,12.0)];//CreatetheshapelayerandsetitspathCAShapeLayer*maskLayer=[CAShapeLay