如何将 CGPath 保存到文件中

Question

我在 CALayers 中绘制了大约 20 个简单的形状，如下图（在 CAShapelayer 中绘制的 CGPaths）。现在我有一个非常长的文件，其中包含这种格式的所有 20 种形状。创建父 UIView 时，它会根据前一个屏幕中选择的内容加载其中一个形状。这工作正常，但维护形状代码太麻烦了。将下面的代码块存储到我可以在需要时调用和执行的单个文件中的最佳方法是什么？（即：star.txt、apple.txt、moon.txt、tree.txt）：

CALayer* root = [[CALayer alloc] init];
root.name = nil;
root.bounds = CGRectMake(0.000000, 0.000000, 768.000000, 768.000000);
root.frame = CGRectMake(0.000000, 0.000000, 768.000000, 768.000000);
[root addSublayer:root];
[root release];
CALayer* root_layer1 = [[CALayer alloc] init];
root_layer1.name = nil;
root_layer1.bounds = CGRectMake(0.000000, 0.000000, 768.000000, 768.000000);
root_layer1.frame = CGRectMake(0.000000, 0.000000, 768.000000, 768.000000);
[someUIView.layer addSublayer:root_layer1];
[root_layer1 release];
CAShapeLayer* root_layer1_layer2 = [[CAShapeLayer alloc] init];
CGMutablePathRef root_layer1_layer2_path_pathref = CGPathCreateMutable();
CGPathMoveToPoint(root_layer1_layer2_path_pathref, NULL, 415.493011, 49.774002);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 448.989014, 153.523010);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 458.575012, 183.251007, 485.170044, 202.583008, 516.384033, 202.510010);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 625.388062, 202.293015);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 656.602051, 202.221008, 683.138062, 221.466003, 692.754028, 251.121002);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 702.427002, 280.804993, 692.263000, 311.960999, 666.968018, 330.239014);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 578.668030, 394.154022);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 553.344055, 412.461029, 543.209045, 443.704010, 552.911011, 473.402039);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 586.781006, 577.006042);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 596.483032, 606.632019, 586.377014, 637.818054, 561.169006, 656.152039);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 535.932983, 674.488037, 503.158997, 674.460022, 477.981018, 656.066040);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 389.881012, 591.846069);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 364.645020, 573.423096, 331.842010, 573.423096, 306.546997, 591.846069);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 218.506989, 656.066040);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 193.298981, 674.460022, 160.525986, 674.488037, 135.287994, 656.152039);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 110.079987, 637.817017, 99.973999, 606.631042, 109.675995, 577.006042);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 143.546997, 473.402039);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 153.276993, 443.704041, 143.112991, 412.461029, 117.789993, 394.154053);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 29.460999, 330.239990);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 4.194000, 311.961975, -5.970001, 280.804993, 3.674999, 251.122009);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 13.320000, 221.467010, 39.856003, 202.222015, 71.041000, 202.294006);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 180.074005, 202.511002);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 211.288010, 202.583008, 237.882019, 183.251007, 247.497009, 153.524002);
CGPathAddLineToPoint(root_layer1_layer2_path_pathref, NULL, 280.964020, 49.775002);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 290.523010, 20.106003, 317.029022, 0.789001, 348.243011, 0.789001);
CGPathAddCurveToPoint(root_layer1_layer2_path_pathref, NULL, 379.398987, 0.787998, 405.936005, 20.105000, 415.493011, 49.774002);
root_layer1_layer2.path = root_layer1_layer2_path_pathref;
CGColorSpaceRef root_layer1_layer2_fillColor_colorref_colorSpace = CGColorSpaceCreateDeviceRGB();
CGFloat root_layer1_layer2_fillColor_colorref_colorComponents[] = {0.858824,0.529412,0.725490,1.000000};
CGColorRef root_layer1_layer2_fillColor_colorref = CGColorCreate(root_layer1_layer2_fillColor_colorref_colorSpace, root_layer1_layer2_fillColor_colorref_colorComponents);
root_layer1_layer2.fillColor = root_layer1_layer2_fillColor_colorref;
root_layer1_layer2.fillRule = @"non-zero";
root_layer1_layer2.strokeColor = 0;
root_layer1_layer2.lineWidth = 1.000000;
root_layer1_layer2.miterLimit = 10.000000;
root_layer1_layer2.lineCap = @"butt";
root_layer1_layer2.lineJoin = @"miter";
root_layer1_layer2.lineDashPhase = 0.000000;
root_layer1_layer2.lineDashPattern = nil;
root_layer1_layer2.name = nil;
root_layer1_layer2.bounds = CGRectMake(0.000000, 0.000000, 697.000000, 670.000000);
root_layer1_layer2.frame = CGRectMake(36.000000, 40.000000, 697.000000, 670.000000);
[root_layer1 addSublayer:root_layer1_layer2];
[root_layer1_layer2 release];

Answer 1

UIBezierPath (iOS) 和 NSBezierPath (Mac) 都支持 NSCoding 协议。如果你用这些类之一包装你的路径，保存和恢复应该很简单。

Answer 2

另一种可能性是将图形保存为 PDF 文件，可以进行图形编辑。然后，您可以从 PDF 中生成 CGImage 并将其绘制在屏幕上。