如何制作带有可选圆角和边框的UIView？

Question

我将角半径应用于UIView，即UIRectCornerTopLeft和UIRectCornerTopRight。当我应用它时，边界在角落消失了。怎么避免这个？

这是我将边框应用于UIView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]

这是我用来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

尝试下面的代码

您想要舍入TopLeft和TopRight

的视图

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

设置角落如下代码

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;

输出为

Answer 2

除非有一些我们不了解的特定要求，否则如果您尝试做的只是围绕角落并且有边框，则不需要bezier路径和掩码。我通常会这样做： myView.layer.borderWidth = 2; myView.layer.cornerRadius = 5;

您是否只希望圆角不需要使用图层舍入？如果是这样，为什么不使用它，然后覆盖一个薄视图覆盖底部位？有点繁琐，但我发现你可以依靠标准控制来绘制自己而不是必须进入核心图形越多越好。

编辑：好吧，鉴于它需要底角没有圆角，如果你在UIView上有一个带有2个子视图的类别怎么样：1有4个圆角，另有4个在顶部（self bringSubviewToFront），它简单地涵盖了圆形视图＆＃34;页脚＆＃34;具有非圆形条带，即具有相等宽度和微小高度的视图，其等于圆角半径。如果你有纯色背景，那么只需使两个子视图相同;如果你有一些纹理或图像背景，让它们都是透明的，并将纹理/图像放在超级视图上（使用你的类别的特定布局方法的父视图）。最后，将边框放在同一个超视图上。应该工作，让我知道你的想法。

Answer 3

找到这段代码。实际上没有尝试过，但似乎这就是你需要的。

- (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;
}

这段代码添加了一个虚线，但您可以通过_shapeLayer.lineDashPattern修改它。