如何使用UIBezierPath裁剪图像？ [英] How to crop the image using UIBezierPath?

问题描述

我想从 UIBezierpath 关闭路径获取图像（参见图片）。我使用 drawRect 方法在 UIView 上绘制图像，并且还使用绘制线条drawRect 方法。
如何获得特定的封闭路径图像？请帮帮我。在此先感谢。

I want to get the image from the UIBezierpath closed path(See the image). I draw the image on the UIView using drawRect method and also draw the lines are using the drawRect method. How can I get the particular closed path image? Please help me. Thanks in advance.

此代码用于绘制bezierpath。

This code used for draw the bezierpath.

UIBezierPath *aPath = [UIBezierPath bezierPath];
for (NSString *pointString in pointArray) {
    if ([pointArray indexOfObject:pointString] == 0)
        [aPath moveToPoint:CGPointFromString(pointString)];
    else
        [aPath addLineToPoint:CGPointFromString(pointString)];
}
[aPath closePath];

推荐答案

您可以使用 shapeLayer 为此。类似的东西，

You can use a shapeLayer for that. Something like,

UIBezierPath *aPath = [UIBezierPath bezierPath];
for (NSString *pointString in pointArray) {
    if ([pointArray indexOfObject:pointString] == 0)
        [aPath moveToPoint:CGPointFromString(pointString)];
    else
        [aPath addLineToPoint:CGPointFromString(pointString)];
}
[aPath closePath];

CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = aPath.CGPath;
[view.layer setMask:shapeLayer];//or make it as [imageview.layer setMask:shapeLayer]; 
//and add imageView as subview of whichever view you want. draw the original image
//on the imageview in that case

将其作为一个图片，

UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

image 应该有相应的图像。

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