我正在尝试为我成功的UI
Image添加一个六边形面具.但是我无法绕六边形面具的两侧.我想加上cell.profilePic.layer.cornerRadius = 10;会做的伎俩,但它没有.
这是我的代码：
CGRect rect = cell.profilePic.frame; CAShapeLayer *hexagonMask = [CAShapeLayer layer]; CAShapeLayer *hexagonBorder = [CAShapeLayer layer]; hexagonBorder.frame = cell.profilePic.layer.bounds; UIBezierPath *hexagonPath = [UIBezierPath bezierPath]; CGFloat sideWidth = 2 * ( 0.5 * rect.size.width / 2 ); CGFloat lcolumn = ( rect.size.width - sideWidth ) / 2; CGFloat rcolumn = rect.size.width - lcolumn; CGFloat height = 0.866025 * rect.size.height; CGFloat y = (rect.size.height - height) / 2; CGFloat by = rect.size.height - y; CGFloat midy = rect.size.height / 2; CGFloat rightmost = rect.size.width; [hexagonPath movetoPoint:CGPointMake(lcolumn,y)]; [hexagonPath addLinetoPoint:CGPointMake(rcolumn,y)]; [hexagonPath addLinetoPoint:CGPointMake(rightmost,midy)]; [hexagonPath addLinetoPoint:CGPointMake(rcolumn,by)]; [hexagonPath addLinetoPoint:CGPointMake(lcolumn,by)]; [hexagonPath addLinetoPoint:CGPointMake(0,midy)]; [hexagonPath addLinetoPoint:CGPointMake(lcolumn,y)]; hexagonMask.path = hexagonPath.CGPath; hexagonBorder.path = hexagonPath.CGPath; hexagonBorder.fillColor = [UIColor clearColor].CGColor; hexagonBorder.strokeColor = [UIColor blackColor].CGColor; hexagonBorder.linewidth = 5; cell.profilePic.layer.mask = hexagonMask; cell.profilePic.layer.cornerRadius = 10; cell.profilePic.layer.masksToBounds = YES; [cell.profilePic.layer addSublayer:hexagonBorder];
有任何想法吗？
谢谢
解决方法
您可以定义一个带圆角的六边形路径(手动定义该路径),然后将其应用为蒙版和边框子图层：
CGFloat linewidth = 5.0; UIBezierPath *path = [UIBezierPath polygonInRect:self.imageView.bounds sides:6 linewidth:linewidth cornerRadius:30]; // mask for the image view CAShapeLayer *mask = [CAShapeLayer layer]; mask.path = path.CGPath; mask.linewidth = linewidth; mask.strokeColor = [UIColor clearColor].CGColor; mask.fillColor = [UIColor whiteColor].CGColor; self.imageView.layer.mask = mask; // if you also want a border,add that as a separate layer CAShapeLayer *border = [CAShapeLayer layer]; border.path = path.CGPath; border.linewidth = linewidth; border.strokeColor = [UIColor blackColor].CGColor; border.fillColor = [UIColor clearColor].CGColor; [self.imageView.layer addSublayer:border];
具有圆角的正多边形的路径可能在类似的类别中实现：
@interface UIBezierPath (polygon) /** Create UIBezierPath for regular polygon with rounded corners * * @param rect The CGRect of the square in which the path should be created. * @param sides How many sides to the polygon (e.g. 6=hexagon; 8=octagon,etc.). * @param linewidth The width of the stroke around the polygon. The polygon will be inset such that the stroke stays within the above square. * @param cornerRadius The radius to be applied when rounding the corners. * * @return UIBezierPath of the resulting rounded polygon path. */ + (instancetype)polygonInRect:(CGRect)rect sides:(NSInteger)sides linewidth:(CGFloat)linewidth cornerRadius:(CGFloat)cornerRadius; @end
和
@implementation UIBezierPath (polygon) + (instancetype)polygonInRect:(CGRect)rect sides:(NSInteger)sides linewidth:(CGFloat)linewidth cornerRadius:(CGFloat)cornerRadius { UIBezierPath *path = [UIBezierPath bezierPath]; CGFloat theta = 2.0 * M_PI / sides; // how much to turn at every corner CGFloat offset = cornerRadius * tanf(theta / 2.0); // offset from which to start rounding corners CGFloat squareWidth = MIN(rect.size.width,rect.size.height); // width of the square // calculate the length of the sides of the polygon CGFloat length = squareWidth - linewidth; if (sides % 4 != 0) { // if not dealing with polygon which will be square with all sides ... length = length * cosf(theta / 2.0) + offset/2.0; // ... offset it inside a circle inside the square } CGFloat sideLength = length * tanf(theta / 2.0); // start drawing at `point` in lower right corner CGPoint point = CGPointMake(rect.origin.x + rect.size.width / 2.0 + sideLength / 2.0 - offset,rect.origin.y + rect.size.height / 2.0 + length / 2.0); CGFloat angle = M_PI; [path movetoPoint:point]; // draw the sides and rounded corners of the polygon for (NSInteger side = 0; side < sides; side++) { point = CGPointMake(point.x + (sideLength - offset * 2.0) * cosf(angle),point.y + (sideLength - offset * 2.0) * sinf(angle)); [path addLinetoPoint:point]; CGPoint center = CGPointMake(point.x + cornerRadius * cosf(angle + M_PI_2),point.y + cornerRadius * sinf(angle + M_PI_2)); [path addArcWithCenter:center radius:cornerRadius startAngle:angle - M_PI_2 endAngle:angle + theta - M_PI_2 clockwise:YES]; point = path.currentPoint; // we don't have to calculate where the arc ended ... UIBezierPath did that for us angle += theta; } [path closePath]; path.linewidth = linewidth; // in case we're going to use CoreGraphics to stroke path,rather than CAShapeLayer path.lineJoinStyle = kCGLineJoinRound; return path; }
产生这样的结果：
或者在Swift 3中你可以这样做：
let linewidth: CGFloat = 5 let path = UIBezierPath(polygonIn: imageView.bounds,sides: 6,linewidth: linewidth,cornerRadius: 30) let mask = CAShapeLayer() mask.path = path.cgPath mask.linewidth = linewidth mask.strokeColor = UIColor.clear.cgColor mask.fillColor = UIColor.white.cgColor imageView.layer.mask = mask let border = CAShapeLayer() border.path = path.cgPath border.linewidth = linewidth border.strokeColor = UIColor.black.cgColor border.fillColor = UIColor.clear.cgColor imageView.layer.addSublayer(border)
同
extension UIBezierPath {
/// Create UIBezierPath for regular polygon with rounded corners
///
/// - parameter rect: The CGRect of the square in which the path should be created.
/// - parameter sides: How many sides to the polygon (e.g. 6=hexagon; 8=octagon,etc.).
/// - parameter linewidth: The width of the stroke around the polygon. The polygon will be inset such that the stroke stays within the above square. Default value 1.
/// - parameter cornerRadius: The radius to be applied when rounding the corners. Default value 0.
convenience init(polygonIn rect: CGRect,sides: Int,linewidth: CGFloat = 1,cornerRadius: CGFloat = 0) {
self.init()
let theta = 2 * CGFloat.pi / CGFloat(sides) // how much to turn at every corner
let offset = cornerRadius * tan(theta / 2) // offset from which to start rounding corners
let squareWidth = min(rect.size.width,rect.size.height) // width of the square
// calculate the length of the sides of the polygon
var length = squareWidth - linewidth
if sides % 4 != 0 { // if not dealing with polygon which will be square with all sides ...
length = length * cos(theta / 2) + offset / 2 // ... offset it inside a circle inside the square
}
let sideLength = length * tan(theta / 2)
// if you'd like to start rotated 90 degrees,use these lines instead of the following two:
//
// var point = CGPoint(x: rect.midX - length / 2,y: rect.midY + sideLength / 2 - offset)
// var angle = -CGFloat.pi / 2.0
// if you'd like to start rotated 180 degrees,use these lines instead of the following two:
//
// var point = CGPoint(x: rect.midX - sideLength / 2 + offset,y: rect.midY - length / 2)
// var angle = CGFloat(0)
var point = CGPoint(x: rect.midX + sideLength / 2 - offset,y: rect.midY + length / 2)
var angle = CGFloat.pi
move(to: point)
// draw the sides and rounded corners of the polygon
for _ in 0 ..< sides {
point = CGPoint(x: point.x + (sideLength - offset * 2) * cos(angle),y: point.y + (sideLength - offset * 2) * sin(angle))
addLine(to: point)
let center = CGPoint(x: point.x + cornerRadius * cos(angle + .pi / 2),y: point.y + cornerRadius * sin(angle + .pi / 2))
addArc(withCenter: center,radius: cornerRadius,startAngle: angle - .pi / 2,endAngle: angle + theta - .pi / 2,clockwise: true)
point = currentPoint
angle += theta
}
close()
self.linewidth = linewidth // in case we're going to use CoreGraphics to stroke path,rather than CAShapeLayer
lineJoinStyle = .round
}
}
对于Swift 2的演绎,请参阅previous revision of this answer.
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