如何将 CGPath 保存到文件

Question

我在 CALayers 中绘制了大约 20 个简单形状，如下所示（在 CAShapelayer 中绘制的 CGPath）。现在我有一个非常长的文件，其中包含这种格式的所有 20 个形状。创建父 UIView 时，它会根据上一屏幕中选择的内容加载这些形状之一。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一个单独的文件中，我可以在需要时调用并执行该文件的最佳方法是什么？（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。如果您使用这些类之一包装您的路径，则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。