UIBezierPath*bezierPath = [UIBezierPathbezierPath];
//M_PI_2二分之PI
[bezierPathaddArcWithCenter:CGPointMake(150,150)radius:100startAngle:M_PI_2*3endAngle:0clockwise:YES];
[bezierPathaddLineToPoint:CGPointMake(150,150)];
[bezierPathclosePath];
[bezierPathmoveToPoint:CGPointMake(150,150+100)];
[bezierPathaddArcWithCenter:CGPointMake(150,150)radius:100startAngle:M_PI_2endAngle:M_PIclockwise:YES];
[bezierPathaddLineToPoint:CGPointMake(150,150)];
[bezierPathclosePath];
bezierPath.lineWidth=5;
//[[UIColor redColor]setStroke];
//[bezierPath stroke];
[[UIColorgreenColor]setFill];
[bezierPathfill];
