iOS控件设置虚线框

通过CAShapeLayer和UIBezierPath给控件添加虚线或设置虚线条。备用   - (void)viewDidLoad {     [super viewDidLoad];     [self createShapeLayer_A];    [self createShapeLayerLine];     [self createShapeLayer_B];   } //侧边的虚线：左

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