Draw circle with UIBezierPath

Question

I\'m trying to draw a circle using UIBezierPath addArcWithCenter method :

UIBezierPath *bezierPath = 
  [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0.,         


        

Answer 1

startAngle:degreesToRadians(-90) endAngle:0 clockwise:YES

(The reason is that the default coordinate system on iOS has a x-axis pointing to the right, and a y-axis pointing down.)

read this document https://developer.apple.com/library/ios/documentation/uikit/reference/UIBezierPath_class/index.html

specifying a start angle of 0 radians, an end angle of π radians, and setting the clockwise parameter to YES draws the bottom half of the circle. However, specifying the same start and end angles but setting the clockwise parameter set to NO draws the top half of the circle.