iOS控件設置虛線框

通過CAShapeLayer和UIBezierPath給控件添加虛線或設置虛線條。備用   - (void)viewDidLoad {     [super viewDidLoad];     [self createShapeLayer_A];    [self createShapeLayerLine];     [self createShapeLayer_B];   } //側邊的虛線：左

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