Ios 将线宽设置为径向渐变
我用径向梯度画圆。它工作正常,但现在我想设置边框颜色和边框宽度。我试过了,但不起作用 这是我的密码Ios 将线宽设置为径向渐变,ios,core-graphics,radial-gradients,Ios,Core Graphics,Radial Gradients,我用径向梯度画圆。它工作正常,但现在我想设置边框颜色和边框宽度。我试过了,但不起作用 这是我的密码 CGGradientRef gradient; CGColorSpaceRef colorSpace; CGFloat locations[] = {0.0,1.0}; CGFloat components[] = { red2,green2,blue2,1.0,red1,green1,blue1,1.0 }; colorSpace = CGColorSpaceCreateDeviceRGB()
CGGradientRef gradient;
CGColorSpaceRef colorSpace;
CGFloat locations[] = {0.0,1.0};
CGFloat components[] = { red2,green2,blue2,1.0,red1,green1,blue1,1.0 };
colorSpace = CGColorSpaceCreateDeviceRGB();
gradient = CGGradientCreateWithColorComponents(colorSpace,components,locations,
sizeof(locations)/sizeof(CGFloat));
CGPoint start = CGPointMake(self.bounds.size.width/2, self.bounds.size.height/2 ), end = CGPointMake(self.bounds.size.width/2 , self.bounds.size.height/2);
CGFloat startRadius = 0.0, endRadius = radius;
CGContextDrawRadialGradient(contextRef,gradient,start,startRadius,end,endRadius,0);
CGContextSetLineWidth(contextRef, 5.0);
CGGradientRelease(gradient);
CGColorSpaceRelease(colorSpace);
如何设置边框颜色和宽度?首先添加
QuartzCore
框架,然后尝试此代码
[[Firstbtn layer]setBorderColor:[[UIColor blackColor]CGColor]];
[[self.Firstbtn layer]setBorderWidth:2.3];
[[self.Firstbtn layer]setCornerRadius:15];
没有办法使用cgcontextref吗?