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UIBezierPath *aPth = [UIBezierPath bezierPathWithArcCenter:CGPointMake(55, 65.f) radius:50.f startAngle:-M_PI_2 endAngle:M_PI_2 clockwise:YES];
aPth.lineWidth = 5.0f;
aPth.lineCapStyle = kCGLineCapRound;
aPth.lineJoinStyle = kCGLineJoinRound;
[[UIColor redColor] setStroke];
[[UIColor orangeColor] setFill];
[aPth stroke];
进度条动画
// 第一、 UIBezierPath 绘制线段
UIBezierPath *circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(55, 65.f) radius:50.f startAngle:-M_PI_2 endAngle:M_PI_2*3 clockwise:YES];
// 第二、 UIBezierPath 和 CAShapeLayer 关联
CAShapeLayer *progressLayer = [ CAShapeLayer layer];
progressLayer.path = circlePath. CGPath ;
progressLayer.fillColor = [UIColor clearColor].CGColor;
progressLayer.strokeColor = [ UIColor redColor]. CGColor ;
progressLayer.lineWidth = 5.0f;
progressLayer.lineCap = kCALineCapRound;
//第三，动画
CABasicAnimation *ani = [ CABasicAnimation animationWithKeyPath : NSStringFromSelector ( @selector (strokeEnd))];
ani. fromValue = @0 ;
ani. toValue = @1 ;
ani. duration = 5 ;
[progressLayer addAnimation :ani forKey : NSStringFromSelector ( @selector (strokeEnd))];
[view. layer addSublayer :progressLayer];
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原文地址：http://www.cnblogs.com/binglin92/p/4421113.html
