objective C 如何将 PNG 或 JPEG 转换为 UIBezierPath

Question

此示例使用 UIBezierPath。

UIBezierPath 可以使用 PNG 或 JPEG 图片吗？

炉膛示例图像：

示例贝塞尔曲线路径：

+ (UIBezierPath *)heartShape:(CGRect)originalFrame
{
    CGRect frame = [self maximumSquareFrameThatFits:originalFrame];

    UIBezierPath* bezierPath = [UIBezierPath bezierPath];
    [bezierPath moveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.74182 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.04948 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.49986 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.24129 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.64732 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.05022 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.55044 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.11201 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.33067 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.06393 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.46023 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.14682 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.39785 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.08864 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.25304 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.05011 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.30516 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.05454 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.27896 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.04999 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.00841 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.36081 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.12805 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.05067 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.00977 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.15998 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.29627 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.70379 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.00709 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.55420 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.18069 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.62648 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.50061 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.92498 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.40835 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.77876 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.48812 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.88133 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.70195 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.70407 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.50990 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.88158 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.59821 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.77912 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.99177 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.35870 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.81539 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.62200 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.99308 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.55208 * CGRectGetHeight(frame))];
    [bezierPath addCurveToPoint: CGPointMake(CGRectGetMinX(frame) + 0.74182 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.04948 * CGRectGetHeight(frame)) controlPoint1: CGPointMake(CGRectGetMinX(frame) + 0.99040 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.15672 * CGRectGetHeight(frame)) controlPoint2: CGPointMake(CGRectGetMinX(frame) + 0.86824 * CGRectGetWidth(frame), CGRectGetMinY(frame) + 0.04848 * CGRectGetHeight(frame))];
    [bezierPath closePath];
    bezierPath.miterLimit = 4;

    return bezierPath;
}

Answer 1

创建 UIImage 上下文。

UIGraphicsBeginImageContextWithOptions(CGSizeMake(width,height), NO, 1.0);

画一些路径、形状等..

https://developer.apple.com/library/ios/documentation/2DDrawing/Conceptual/DrawingPrintingiOS/HandlingImages/Images.html

关闭上下文并获取 UIImage 实例；

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

获取 JPEG 数据：

NSData *imageData = UIImageJPEGRepresentation(image, 1.0);

objective C 如何将 PNG 或 JPEG 转换为 UIBezierPath

How to convert PNG or JPEG to UIBezierPath in objective C

image-processing

objective-c

uibezierpath