Drawing a bezier curve between a set of given points

Question

What is the best way to draw a bezier curve, in iOS application, that passes through a set of given points

Answer 1

Please try this.

UIImageView *waterLevel = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,200,200)];
UIGraphicsBeginImageContext(waterLevel.frame.size);
[waterLevel.image drawAtPoint:CGPointZero];
//define BezierPath
UIBezierPath *bezierPath = [UIBezierPath bezierPath];


// Set the starting point of the shape.
[bezierPath moveToPoint:CGPointMake(0, 0)];

[bezierPath addLineToPoint:CGPointMake(waterLevel.frame.size.width, 0)];
[bezierPath addLineToPoint:CGPointMake(waterLevel.frame.size.width, waterLevel.frame.size.height)];
[bezierPath addLineToPoint:CGPointMake(0, waterLevel.frame.size.height)];
[bezierPath closePath];

bezierPath.lineWidth = 15;
//set the stoke color
[[UIColor blackColor] setStroke];
//draw the path
[bezierPath stroke];

// Add to the current Graphic context
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddPath(context,bezierPath.CGPath);
waterLevel.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

[self.view addSubview:waterLevel];