如何找出未着色的区域uibeizerpath? [英] How to find out uncoloured area uibeizerpath?

问题描述

那个灰色是 UIImageView，白色字体是 Image.

That greycolour is UIImageView and the White colour font is Image.

该图像放置在 UIImageView 中.

That image Placed inside UIImageView.

我喜欢只在字体内部着色，而不是整个 UIImageview 因为我要找出图像的坐标.

I like to colour only inside the font ,not an whole UIImageview for that i am going to find out the coordinates of the image .

我是这种概念的新手，所以请有人指导我如何只在图像内部着色，那里有 50 多张图像，它不是静态的，所以请给出一些好主意.

i am new to this kind of concept so kindly some one guide me how to colour only inside the image ,there are 50+ images is there ,it is not static so give some good idea .

这是我用来在 UIImageView 中绘制的代码:

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

    UITouch *touch = [[event allTouches] anyObject];
    touchPoint = [touch locationInView:self.imgColor];

        UIBezierPath *path = [UIBezierPath bezierPath];
        [path moveToPoint:CGPointMake(touchPoint.x,touchPoint.y)];
        [path addLineToPoint:CGPointMake(startingPoint.x,startingPoint.y)];


        startingPoint=touchPoint;
        CAShapeLayer *shapeLayer = [CAShapeLayer layer];
        shapeLayer.path = [path CGPath];
        shapeLayer.strokeColor = [[UIColor blueColor] CGColor];
        shapeLayer.lineWidth = 3.0;
        shapeLayer.fillColor = [[UIColor redColor] CGColor];
        [self.imgColor.layer addSublayer:shapeLayer];
        [arrLayer addObject:shapeLayer];

    NSLog(@"Touch moving point =x : %f Touch moving point =y : %f", touchPoint.x, touchPoint.y);



}

推荐答案

使用这个自定义 UIImage 视图:

Use this custom UIImage view:

自定义视图.h

@interface CustomView : UIImageView

@end

自定义视图.m

@interface CustomView ()
{
    CGPoint touchPoint,startingPoint;
    UIView *drawingView;
}

@end


@implementation CustomView

-(void)awakeFromNib
{
    drawingView = [[UIView alloc] initWithFrame:self.bounds];
    drawingView.backgroundColor = [UIColor clearColor];
    [self addSubview:drawingView];
    [self updateMask];
}

- (void)updateMask
{
    CALayer *maskLayer = [CALayer layer];
    maskLayer.geometryFlipped = YES;
    maskLayer.contents = (id)self.image.CGImage;
    switch (self.contentMode)
    {
        case UIViewContentModeScaleToFill:
            maskLayer.contentsGravity = kCAGravityResize;
            break;
        case UIViewContentModeScaleAspectFit:
            maskLayer.contentsGravity = kCAGravityResizeAspect;
            break;
        case UIViewContentModeScaleAspectFill:
            maskLayer.contentsGravity = kCAGravityResizeAspectFill;
            break;
        case UIViewContentModeCenter:
            maskLayer.contentsGravity = kCAGravityCenter;
            break;
        case UIViewContentModeTop:
            maskLayer.contentsGravity = kCAGravityTop;
            break;
        case UIViewContentModeBottom:
            maskLayer.contentsGravity = kCAGravityBottom;
            break;
        case UIViewContentModeLeft:
            maskLayer.contentsGravity = kCAGravityLeft;
            break;
        case UIViewContentModeRight:
            maskLayer.contentsGravity = kCAGravityRight;
            break;
        case UIViewContentModeTopLeft:
            maskLayer.contentsGravity = kCAGravityTopLeft;
            break;
        case UIViewContentModeTopRight:
            maskLayer.contentsGravity = kCAGravityTopRight;
            break;
        case UIViewContentModeBottomLeft:
            maskLayer.contentsGravity = kCAGravityBottomLeft;
            break;
        case UIViewContentModeBottomRight:
            maskLayer.contentsGravity = kCAGravityBottomRight;
            break;
        default:
            break;
    }
    maskLayer.frame = drawingView.bounds;
    drawingView.layer.mask = maskLayer;
}


- (void)setImage:(UIImage *)image
{
    [super setImage:image];
    [self updateMask];
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    drawingView.frame = self.bounds;
    drawingView.layer.mask.frame = drawingView.bounds;
}


-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event allTouches] anyObject];
    touchPoint = [touch locationInView:self];

    if (!CGPointEqualToPoint(startingPoint, CGPointZero))
    {
        UIBezierPath *path = [UIBezierPath bezierPath];
        [path moveToPoint:CGPointMake(touchPoint.x,touchPoint.y)];
        [path addLineToPoint:CGPointMake(startingPoint.x,startingPoint.y)];

        CAShapeLayer *shapeLayer = [CAShapeLayer layer];
        shapeLayer.path = [path CGPath];
        shapeLayer.strokeColor = [[UIColor blueColor] CGColor];
        shapeLayer.lineWidth = 3.0;
        shapeLayer.fillColor = [[UIColor redColor] CGColor];
        [drawingView.layer addSublayer:shapeLayer];
    }
    startingPoint=touchPoint;

//    [arrLayer addObject:shapeLayer];
    NSLog(@"Touch moving point =x : %f Touch moving point =y : %f", touchPoint.x, touchPoint.y);
}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(nullable UIEvent *)event;
{
    startingPoint = CGPointZero;
}


@end

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