如何制作带有可选圆角和边框的 UIView？

Question

我将圆角半径应用于UIView，即UIRectCornerTopLeft 和UIRectCornerTopRight。当我应用这个时，边框在角落里消失了。如何避免这种情况？

这就是我对UIView 应用边框的方式：

 [self.middleView addRoundedCorners:UIRectCornerTopLeft|UIRectCornerTopRight withRadii:CGSizeMake(4, 4)];
 self.middleView.layer.borderWidth = 0.5f;
 self.middleView.layer.borderColor = [[UIColor colorWith8BitRed:0 green:0 blue:0 alpha:0.25]

这是我用于应用可选圆角的类别：

   #import "UIView+Roundify.h"

   @implementation UIView (Roundify)
  - (void)addRoundedCorners:(UIRectCorner)corners withRadii:(CGSize)radii {
   CALayer *tMaskLayer = [self maskForRoundedCorners:corners withRadii:radii];
   self.layer.mask = tMaskLayer;
   }

  - (CALayer*)maskForRoundedCorners:(UIRectCorner)corners withRadii:(CGSize)radii {
    CAShapeLayer *maskLayer = [CAShapeLayer layer];
    maskLayer.frame = self.bounds;

  UIBezierPath *roundedPath = [UIBezierPath bezierPathWithRoundedRect:
                             maskLayer.bounds byRoundingCorners:corners cornerRadii:radii];
    maskLayer.fillColor = [[UIColor whiteColor] CGColor];
    maskLayer.backgroundColor = [[UIColor clearColor] CGColor];
    maskLayer.path = [roundedPath CGPath];

   return maskLayer;
 }

Answer 1

试试下面的代码吧

您要舍入 TopLeft 和 TopRight 的视图

   UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(50, 100, 100, 100)];
   [view1 setBackgroundColor:[UIColor grayColor]];
   [self.view addSubview:view1];

如下代码设置角

UIBezierPath *maskPath;
maskPath = [UIBezierPath bezierPathWithRoundedRect:view1.bounds byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight) cornerRadii:CGSizeMake(5.0, 5.0)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.view.bounds;
maskLayer.path = maskPath.CGPath;
view1.layer.mask = maskLayer;

输出是：

Answer 2

找到了这段代码。还没有真正尝试过，但似乎是你需要的。

- (void)drawDashedBorderAroundView:(UIView *)v {

    //border definitions
    CGFloat cornerRadius = 10;
    CGFloat borderWidth = 2;
    NSInteger dashPattern1 = 8;
    NSInteger dashPattern2 = 8;
    UIColor *lineColor = [UIColor orangeColor];

    //drawing
    CGRect frame = v.bounds;

    CAShapeLayer *_shapeLayer = [CAShapeLayer layer];

    //creating a path
    CGMutablePathRef path = CGPathCreateMutable();

    //drawing a border around a view
    CGPathMoveToPoint(path, NULL, 0, frame.size.height - cornerRadius);
    CGPathAddLineToPoint(path, NULL, 0, cornerRadius);
    CGPathAddArc(path, NULL, cornerRadius, cornerRadius, cornerRadius, M_PI, -M_PI_2, NO);
    CGPathAddLineToPoint(path, NULL, frame.size.width - cornerRadius, 0);
    CGPathAddArc(path, NULL, frame.size.width - cornerRadius, cornerRadius, cornerRadius, -M_PI_2, 0, NO);
    CGPathAddLineToPoint(path, NULL, frame.size.width, frame.size.height - cornerRadius);
    CGPathAddArc(path, NULL, frame.size.width - cornerRadius, frame.size.height - cornerRadius, cornerRadius, 0, M_PI_2, NO);
    CGPathAddLineToPoint(path, NULL, cornerRadius, frame.size.height);
    CGPathAddArc(path, NULL, cornerRadius, frame.size.height - cornerRadius, cornerRadius, M_PI_2, M_PI, NO);

    //path is set as the _shapeLayer object's path
    _shapeLayer.path = path;
    CGPathRelease(path);

    _shapeLayer.backgroundColor = [[UIColor clearColor] CGColor];
    _shapeLayer.frame = frame;
    _shapeLayer.masksToBounds = NO;
    [_shapeLayer setValue:[NSNumber numberWithBool:NO] forKey:@"isCircle"];
    _shapeLayer.fillColor = [[UIColor clearColor] CGColor];
    _shapeLayer.strokeColor = [lineColor CGColor];
    _shapeLayer.lineWidth = borderWidth;
    _shapeLayer.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:dashPattern1], [NSNumber numberWithInt:dashPattern2], nil];
    _shapeLayer.lineCap = kCALineCapRound;

    //_shapeLayer is added as a sublayer of the view, the border is visible
    [v.layer addSublayer:_shapeLayer];
    v.layer.cornerRadius = cornerRadius;
}

这段代码添加了一条虚线，但您可以通过_shapeLayer.lineDashPattern 对其进行修改。

Answer 3

除非有一些我们不知道的特定要求，否则如果您想要做的只是圆角并有边框，则贝塞尔路径和蒙版是不必要的。我通常会这样做： myView.layer.borderWidth=2; myView.layer.cornerRadius=5;

您是否只希望顶角圆角而不需要使用图层圆角？如果是这样，为什么不使用它然后覆盖一个薄视图以覆盖底部位？有点繁琐，但我发现您越能依靠标准控件来绘制自己，而不必进入核心图形，效果就越好。

编辑：好的，考虑到它需要不使底角变圆，如果您在 UIView 上有一个具有 2 个子视图的类别怎么样：1 个具有 4 个圆角，另一个位于顶部(self bringSubviewToFront) 仅用非圆角条覆盖圆角视图的“页脚”，即宽度相等且高度很小的视图，等于圆角半径。如果您有纯色背景，则只需使两个子视图相同；如果您有一些纹理或图像背景，请使它们都透明并将纹理/图像放在超级视图（使用您的类别特定布局方法的父视图）上。最后，将边框放在同一个超级视图上。应该工作，让我知道你的想法。