我试着画两个圆,一个在另一个里面,如下图所示。
我已经很好地画了一个圆(外部的那个),但我不确定如何在顶部添加第二个圆,以及如何将其居中。
- (void)drawRect:(CGRect)rect {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 4.0);
CGContextSetStrokeColorWithColor(context,
[UIColor whiteColor].CGColor);
//
UIColor *theFillColor = UIColorFromRGB(0x6c83a6);
CGContextSetFillColor(context, CGColorGetComponents(theFillColor.CGColor));
CGRect rectangle = CGRectMake(5.0,5.0,rect.size.width-10.0,rect.size.height-10.0);
CGContextAddEllipseInRect(context, rectangle);
CGContextStrokePath(context);
CGContextFillEllipseInRect(context, rectangle);
UIGraphicsEndImageContext();
//
// INSIDE ?
//
}
发布于 2012-03-13 20:45:46
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 4.0);
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
UIColor *theFillColor = UIColorFromRGB(0x6c83a6);
CGContextSetFillColorWithColor(context, theFillColor.CGColor);
CGRect rectangle = CGRectMake(5.0,5.0,rect.size.width-10.0,rect.size.height-10.0);
CGContextBeginPath(context);
CGContextAddEllipseInRect(context, rectangle);
CGContextDrawPath(context, kCGPathFillStroke); // Or kCGPathFill
CGRect smallRect = CGRectInset(rectangle, 40, 40); // change 40 with the desired value
// You may change the fill and stroke here before drawing the circle
CGContextBeginPath(context);
CGContextAddEllipseInRect(context, smallRect);
CGContextDrawPath(context, kCGPathFillStroke); // Or kCGPathFill
UIGraphicsEndImageContext();
发布于 2012-10-13 02:16:31
/*类似于前面的解决方案,但稍微简单一些。定义的半径和起点-终点角度变量仅为清晰起始点。*/
#define PI 3.14285714285714
float radius1 = 80;
float radius2 = 30;
float startAngle = 0;
float endAngle = endAngle = PI*2;
CGPoint position = CGPointMake(100,100);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(context, 4.0);
CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
UIColor *theFillColor = UIColorFromRGB(0x6c83a6);
CGContextSetFillColorWithColor(context, theFillColor.CGColor);
CGContextBeginPath(context);
CGContextAddArc(ctx, position.x, position.y, radius1, startAngle, endAngle, 1);
CGContextDrawPath(context, kCGPathFillStroke); // Or kCGPathFill
// You may change the fill and stroke here before drawing the circle
CGContextBeginPath(context);
CGContextAddArc(ctx, position.x, position.y, radius2, startAngle, endAngle, 1);
CGContextDrawPath(context, kCGPathFillStroke); // Or kCGPathFill
UIGraphicsEndImageContext();
发布于 2016-07-21 06:04:48
斯威夫特
func drawRect(rect: CGRect) {
let context: CGContextRef = UIGraphicsGetCurrentContext()!
CGContextSetLineWidth(context, 4.0)
CGContextSetStrokeColorWithColor(context, UIColor(hue: 0, saturation: 0, brightness: 94, alpha: 242).CGColor)
let theFillColor: UIColor = UIColor(hue: 0, saturation: 100, brightness: 80, alpha: 204)
CGContextSetFillColorWithColor(context, theFillColor.CGColor)
let rectangle: CGRect = CGRectMake(5.0, 5.0, rect.size.width-10.0, rect.size.height-10.0)
CGContextBeginPath(context)
CGContextAddEllipseInRect(context, rectangle)
CGContextDrawPath(context, CGPathDrawingMode.FillStroke)
let smallRect: CGRect = CGRectInset(rectangle, 40, 40)
CGContextBeginPath(context)
CGContextAddEllipseInRect(context, smallRect)
CGContextDrawPath(context, CGPathDrawingMode.FillStroke)
UIGraphicsEndImageContext()
}
https://stackoverflow.com/questions/9684006
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