ios-如何在UIImage中切孔

Question

有什么方法可以在我的圖像上打一個洞。 我想要的是割眼睛和嘴。 我希望它變得透明。

Answer 1

制作一個UIBezierPath將要使其透明的閉合路徑的所有頂點。 貝塞爾曲線的路徑如下所示：

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];

然后使用以下代碼使該區域透明並保存為新圖像

// 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

試試這個

首先添加石英芯

 #import <QuartzCore/QuartzCore.h>

創建您要剪切的路徑

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

然后創建一個遮罩層並將其添加到視圖中-CAShapeLayer將允許您定義任何路徑

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

yourView.layer.mask = maskLayer;