iOS 使用CAShapeLayer给View添加虚线边框

效果图

Paste_Image.png

想多了解CAShapeLayer
http://www.jianshu.com/p/fded808bbe8a

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    UIView *view = [[UIView alloc] init];
    
    [self.view addSubview:view];
    
    view.backgroundColor = [UIColor redColor];
    
    view.frame = CGRectMake(100, 100, 100, 100);
    
    [self addBorderToLayer:view];
}


- (void)addBorderToLayer:(UIView *)view
{
    CAShapeLayer *border = [CAShapeLayer layer];
    //  线条颜色
    border.strokeColor = [UIColor blackColor].CGColor;
    
    border.fillColor = nil;
    
    border.path = [UIBezierPath bezierPathWithRect:view.bounds].CGPath;
    
    border.frame = view.bounds;
    
    // 不要设太大 不然看不出效果
    border.lineWidth = 1;
    
    border.lineCap = @"square";
    
    //  第一个是 线条长度   第二个是间距    nil时为实线
    border.lineDashPattern = @[@9, @4];
    
    [view.layer addSublayer:border];
}