Draw an line in iOS objective C using hand Drawing

Solution:

If you want to draw an line using your hand then use the below code.

Using the touches start and end method to draw the line.

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

UIBezierPath *myPath;

CGPoint firstPoint; // (3)

CGPoint initPoint;

- (void)viewDidLoad {

    [super viewDidLoad];

    

    // Do any additional setup after loading the view.

}

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

UITouch *touch = [[event allTouches]anyObject];

CGPoint touchLocation = [touch locationInView:self.view];

myPath = [UIBezierPath bezierPath];

    firstPoint = touchLocation;

    initPoint = touchLocation;

[myPath moveToPoint:touchLocation];

}

- (void) touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

UIBezierPath *path = [UIBezierPath bezierPath];

    UITouch *touch = [[event allTouches]anyObject];

    CGPoint touchLocation = [touch locationInView:self.view];

[path moveToPoint:CGPointMake(firstPoint.x , firstPoint.y)];

[path addLineToPoint:CGPointMake(touchLocation.x, touchLocation.y)];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    shapeLayer.path = [path CGPath];

    shapeLayer.strokeColor = [[UIColor blackColor] CGColor];

    shapeLayer.lineWidth = 3.0;

    shapeLayer.fillColor = [[UIColor clearColor] CGColor];

    self.view.layer.sublayers = nil;

    [self.view.layer addSublayer:shapeLayer];

    firstPoint = touchLocation;

}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    UIBezierPath *path = [UIBezierPath bezierPath];

    UITouch *touch = [[event allTouches]anyObject];

    CGPoint touchLocation = [touch locationInView:self.view];

    [path moveToPoint:CGPointMake(initPoint.x , initPoint.y)];

    [path addLineToPoint:CGPointMake(touchLocation.x, touchLocation.y)];

        CAShapeLayer *shapeLayer = [CAShapeLayer layer];

        shapeLayer.path = [path CGPath];

        shapeLayer.strokeColor = [[UIColor blackColor] CGColor];

        shapeLayer.lineWidth = 3.0;

        shapeLayer.fillColor = [[UIColor clearColor] CGColor];

        [self.view.layer addSublayer:shapeLayer];

        firstPoint = touchLocation;

}

@end