#import <Foundation/Foundation.h>//------------------------------------------------
// constants for the different kinds of shapes and their colorstypedef enum {
kRedColor,
kGreenColor,
kBlueColor
} ShapeColor;
// --------------------------------------------------
// Shape bounding rectangle
typedef struct {
int x, y, width, height;
} ShapeRect;
// --------------------------------------------------
// convert from the ShapeColor enum value to a human-readable nameNSString *colorName (ShapeColor color)
{
switch (color) {
case kRedColor:
return @"red";
break;
case kGreenColor:
return @"green";
break;
case kBlueColor:
return @"blue";
break;
}
return @"no clue";
} // colorName
// --------------------------------------------------
// All about Circles@interface Circle : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}- (void) setFillColor: (ShapeColor) fillColor;- (void) setBounds: (ShapeRect) bounds;- (void) draw;@end // Circle
@implementation Circle- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing a circle at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw@end // Circle
// --------------------------------------------------
// All about Rectangles@interface Rectangle : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}- (void) setFillColor: (ShapeColor) fillColor;- (void) setBounds: (ShapeRect) bounds;- (void) draw;@end // Rectangle
@implementation Rectangle- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing a rectangle at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw@end // Rectangle
// --------------------------------------------------
// All about OblateSphereoids@interface OblateSphereoid : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}- (void) setFillColor: (ShapeColor) fillColor;- (void) setBounds: (ShapeRect) bounds;- (void) draw;@end // OblateSphereoid
@implementation OblateSphereoid- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing an egg at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw@end // OblateSphereoid// --------------------------------------------------
// All about Triangles@interface Triangle : NSObject
{
ShapeColor fillColor;
ShapeRect bounds;
}- (void) setFillColor: (ShapeColor) fillColor;- (void) setBounds: (ShapeRect) bounds;- (void) draw;@end // Triangle
@implementation Triangle- (void) setFillColor: (ShapeColor) c
{
fillColor = c;
} // setFillColor
- (void) setBounds: (ShapeRect) b
{
bounds = b;
} // setBounds
- (void) draw
{
NSLog (@"drawing a triangle at (%d %d %d %d) in %@",
bounds.x, bounds.y,
bounds.width, bounds.height,
colorName(fillColor));
} // draw@end // Triangle
// --------------------------------------------------
// Draw the shapesvoid drawShapes (id shapes[], int count)
{
for (int i = 0; i < count; i++)
{
id shape = shapes[i];
[shape draw];
}
} // drawShapes// --------------------------------------------------
// The main function. Make the shapes and draw themint main (int argc, const char * argv[])
{
id shapes[4];
ShapeRect rect0 = { 0, 0, 10, 30 };
shapes[0] = [Circle new];
[shapes[0] setBounds: rect0];
[shapes[0] setFillColor: kRedColor];
ShapeRect rect1 = { 30, 40, 50, 60 };
shapes[1] = [Rectangle new];
[shapes[1] setBounds: rect1];
[shapes[1] setFillColor: kGreenColor];
ShapeRect rect2 = { 15, 19, 37, 29 };
shapes[2] = [OblateSphereoid new];
[shapes[2] setBounds: rect2];
[shapes[2] setFillColor: kBlueColor];
ShapeRect rect3 = { 47, 32, 80, 50 };
shapes[3] = [Triangle new];
[shapes[3] setBounds: rect3];
[shapes[3] setFillColor: kRedColor];
drawShapes (shapes, 4);
return (0);
} // main
同样的代码,教材实例,我拷贝的就报错,教材源码就可以运行,为什么?
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__unsafe_unretained id shapes[4];void drawShapes (__unsafe_unretained id shapes[], int count)
{
for (int i = 0; i < count; i++)
{
id shape = shapes[i];
[shape draw];
}
} // drawShapes