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我尝试在核心图形中创建 Siri 聊天气泡。我正处于可以绘制形状的阶段。我被这里的颜色困住了。Wanaa 获取边框颜色和填充颜色代码。这是我到目前为止所做的..

- (void)drawInContext:(CGContextRef)context
{

CGRect rect = gradientRectFrame;
CGFloat radius = 30;

CGFloat originBufferX = 0.0;
CGFloat originBufferY = 0.0;
CGFloat rightAngleTriangleWidth = 20.0;
CGFloat rightAngleTriangleHeight = 20.0;
CGFloat fullRectWidth = rect.size.width;
CGFloat fullRectHeight = rect.size.height;


CGPoint pointZero = CGPointMake(originBufferX, fullRectHeight);
CGPoint pointOne = CGPointMake(originBufferX + rightAngleTriangleWidth, fullRectHeight - rightAngleTriangleHeight);
CGPoint pointTwo = CGPointMake(originBufferX + rightAngleTriangleWidth, radius + originBufferY);
CGPoint pointThree = CGPointMake(originBufferX + fullRectWidth - radius, 0 + originBufferY);
CGPoint pointFour = CGPointMake(fullRectWidth, originBufferY + fullRectHeight - radius);    
CGContextSetRGBFillColor(context, 105/255, 105/255, 105/255, 0.5);
 CGContextSetLineWidth(context, 2.0);


CGContextMoveToPoint(context, pointZero.x, pointZero.y);

CGContextAddLineToPoint(context, pointOne.x, pointOne.y);

CGContextAddLineToPoint(context, pointTwo.x, pointTwo.y);

CGContextAddArc(context, rightAngleTriangleWidth + radius, originBufferY + radius, radius, M_PI, -M_PI_2, 0);

CGContextAddLineToPoint(context, pointThree.x, pointThree.y);

CGContextAddArc(context, fullRectWidth - radius, originBufferY + radius, radius, -M_PI_2, 0.0f, 0);

CGContextAddLineToPoint(context, pointFour.x, pointFour.y);

CGContextAddArc(context, fullRectWidth - radius, originBufferY + fullRectHeight - radius, radius, 0.0f, M_PI_2, 0);

CGContextAddLineToPoint(context, pointZero.x, pointZero.y);

CGContextFillPath(context);

CGContextSetRGBStrokeColor(context, 50/255, 50/255, 50/255, 0.5);

// CGContextSetRGBStrokeColor(context, 1.0, 0.0, 0.0, 1.0);

CGContextStrokePath(context);

}

聊天泡泡

在此处输入图像描述

更新的代码：我现在使用 CGPath 而不是 CGContenxt 在填充路径后重绘路径。这是新的代码。虽然，我的笔触颜色还不是很接近..

- (void)drawInContext:(CGContextRef)context

{

CGRect rect = gradientRectFrame;
CGFloat radius = 20;

CGFloat originBufferX = 0.0;
CGFloat originBufferY = 0.0;
CGFloat rightAngleTriangleWidth = 20.0;
CGFloat rightAngleTriangleHeight = 20.0;
CGFloat fullRectWidth = rect.size.width;
CGFloat fullRectHeight = rect.size.height;


CGPoint pointZero = CGPointMake(originBufferX, fullRectHeight);
CGPoint pointOne = CGPointMake(originBufferX + rightAngleTriangleWidth, fullRectHeight - rightAngleTriangleHeight);
CGPoint pointTwo = CGPointMake(originBufferX + rightAngleTriangleWidth, radius + originBufferY);
CGPoint pointThree = CGPointMake(originBufferX + fullRectWidth - radius, 0 + originBufferY);
CGPoint pointFour = CGPointMake(fullRectWidth, originBufferY + fullRectHeight - radius);    

CGContextSetRGBStrokeColor(context, 0.8, 0.8, 0.8, 0.3);

CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, pointZero.x, pointZero.y);

CGPathAddLineToPoint(path, NULL, pointOne.x, pointOne.y);

CGPathAddLineToPoint(path, NULL, pointTwo.x, pointTwo.y);

CGPathAddArc(path, NULL, rightAngleTriangleWidth + radius, originBufferY + radius, radius, M_PI, -M_PI_2, 0);

CGPathAddLineToPoint(path, NULL, pointThree.x, pointThree.y);

CGPathAddArc(path, NULL, fullRectWidth - radius, originBufferY + radius, radius, -M_PI_2, 0.0f, 0);

CGPathAddLineToPoint(path, NULL, pointFour.x, pointFour.y);

CGPathAddArc(path, NULL, fullRectWidth - radius, originBufferY + fullRectHeight - radius, radius, 0.0f, M_PI_2, 0);

CGPathAddLineToPoint(path, NULL, pointZero.x, pointZero.y);

CGContextSaveGState(context);
CGContextAddPath(context, path);

CGContextSetLineWidth(context, 2.0f);
CGContextSetRGBFillColor(context, 1.0f, 1.0f, 1.0f, 0.1f);
CGContextFillPath(context);

CGContextAddPath(context, path);
CGContextStrokePath(context);

}

在此处输入图像描述

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1 回答 1

2

填充颜​​色主要是白色，不透明度约为 10%。所以原来的背景（类似织物的图案）会透出来，变得稍微亮一些。边框颜色也是白色，但不透明度约为 30%。

此外，边框的右侧和底部有轻微的阴影。

对于颜色，您大约需要：

CGContextSaveGState(context);
CGContextSetShadow(context, CGSizeMake(-15f, -20f), 1.0f);
CGContextSetLineWidth(context, 2.0f);
CGContextSetRGBFillColor(context, 1.0f, 1.0f, 1.0f, 0.1f);
CGContextFillPath(context);
CGContextRestoreGState(context);

CGContextSetRGBStrokeColor(context, 1.0f, 1.0f, 1.0f, 0.3f);
CGContextStrokePath(context);
于 2011-11-04T14:42:31.427 回答