5、面向对象编程入门

pear55

于 2025-11-05 15:08:54 发布

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分类专栏： Objective-C入门精粹文章标签：面向对象编程 Objective-C 类

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面向对象编程入门

1. 传统编程的局限

在传统的编程中，我们可能会编写类似下面的代码来绘制不同的形状：

shapes[0].ﬁllColor = kRedColor;
shapes[0].bounds = rect0;
ShapeRect rect1 = { 30, 40, 50, 60 };
shapes[1].type = kRectangle;
shapes[1].ﬁllColor = kGreenColor;
shapes[1].bounds = rect1;
ShapeRect rect2 = { 15, 18, 37, 29 };
shapes[2].type = kEgg;
shapes[2].ﬁllColor = kBlueColor;
shapes[2].bounds = rect2;
ShapeRect rect3 = { 47, 32, 80, 50 };
shapes[3].type = kTriangle;
shapes[3].ﬁllColor = kRedColor;
shapes[3].bounds = rect3;
drawShapes (shapes, 4);
return (0);

运行这段代码会输出：

drawing a circle at (0 0 10 30) in red
drawing a rectangle at (30 40 50 60) in green
drawing an egg at (15 18 37 29) in blue
drawing a triangle at (47 32 80 50) in red