Question

有什么方法可以在我的图像中剪一个洞。我想要的是削减眼睛和嘴巴。我希望它变得透明。

Answer 1

使UIBezierPath成为您想要透明的闭合路径的所有顶点。 bezier路径是这样的：

UIBezierPath *currentPath = [UIBezierPath bezierPath];
CGPoint tempPoint = CGPointMake(0,0);
[currentPath moveToPoint:CGPointMake(tempPoint.x, tempPoint.y)];

tempPoint = CGPointMake(0,20);
[currentPath addLineToPoint:CGPointMake(tempPoint.x, tempPoint.y)];
tempPoint = CGPointMake(20,20);
[currentPath addLineToPoint:CGPointMake(tempPoint.x, tempPoint.y)];   
tempPoint = CGPointMake(20,0);
[currentPath addLineToPoint:CGPointMake(tempPoint.x, tempPoint.y)];
[currentPath closePath];

然后使用以下代码使该区域透明并保存在新图像中

// Create an image context containing the original UIImage.
UIGraphicsBeginImageContext(originalImage.size);
[originalImage drawAtPoint:CGPointZero];

// Clip to the bezier path and clear that portion of the image.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextAddPath(context,currentPath.CGPath)
CGContextClip(context);
CGContextClearRect(context,CGRectMake(0,0,originalImage.size.width,originalImage.size.height);

// Build a new UIImage from the image context.
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 2

尝试这个

首先添加quartzcore

 #import <QuartzCore/QuartzCore.h>

创建要剪辑的路径

 UIBezierPath *maskPath = [UIBezierPath bezierPathWithRect:yourView.bounds];
    [maskPath appendPath:[UIBezierPath bezierPathWithRect:rectToPunchThroughTheView]];

然后创建一个遮罩层并将其添加到您的视图中 - CAShapeLayer将允许您定义任何路径

CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.fillRule  = kCAFillRuleEvenOdd;
maskLayer.fillColor = [UIColor blackColor].CGColor;
maskLayer.path      = maskPath.CGPath;

yourView.layer.mask = maskLayer;

ios - 如何在UIImage中挖洞

2 个答案: