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这是我第一次尝试使用 typedef。诚然，我对正在发生的事情没有一个非常清楚的想法，但我的理解是 typedef 中的值被分配了从 0 开始的整数。我尝试将它们用作整数，但我得到了各种警告和错误。其中之一是“[NSCFNumber objectForKey:]: unrecognized selector sent to instance”。我不知道如何解决这个问题。我也没有写太多动态 getter/setter，所以我的方法可能是错误的。请帮忙。

// MyView.h

typedef enum 
{
    STYLE_A,
    STYLE_B,
    STYLE_C,
    STYLE_D
} MyShapeStyle;


@interface MyView : UIView
{
    MyShapeStyle shapeStyle;

    CALayer *myLayer;
    MyLayerDelegate *myLayerDelegate;
}

@property (nonatomic) MyShapeStyle shapeStyle;
@property (nonatomic, retain) CALayer *myLayer;
@property (nonatomic, retain) MyLayerDelegate *myLayerDelegate;

@end

// MyView.m

#import "MyView.h"

@implementation MyView

@dynamic shapeStyle;
@synthesize myLayer;
@synthesize myLayerDelegate;


- (id)initWithFrame:(CGRect)frame 
{

    if ((self = [super initWithFrame:frame])) 
    {
        // Initialization code
        MyLayerDelegate *delegate = [[MyLayerDelegate alloc] init];
        self.myLayerDelegate = delegate;


        CALayer *myLayer = [CALayer layer];
        [myLayer setDelegate:delegate];
        [self.layer addSublayer:myLayer];
        self.myLayer = myLayer;
        self.shapeStyle = STYLE_C;

        [delegate release];
    }

    return self;
}

-(MyShapeStyle)shapeStyle
{
    return [[self.myLayer valueForKey:@"style"] integerValue];
}

- (void)setShapeStyle:(MyShapeStyle)style
{
    [self.myLayer setValue:[NSNumber numberWithInt:style] forKey:@"style"];
}

// MyLayerDelegate.m

-(void)drawLayer:(CALayer *)theLayer inContext:(CGContextRef)theContext
{

    int id = [[theLayer valueForKey:@"style"] integerValue];

   if( id == STYLE_A )
   {
   }else if ( id == STYLE_B ){
   }

}
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1 回答 1

1

没有理由valueForKey:在该代码中使用；只需直接获取/设置各种属性。

-(MyShapeStyle)shapeStyle
{
    return (MyShapeStyle) self.myLayer.style;
}

该代码中也不需要@dynamic。仅当您要动态生成方法时才需要这样做。

As for why the objectForKey: does-not-respond error, there isn't anything in that code that should trigger that. Could be a retain/release issue or it could be a problem in some other code that you haven't shown.

于 2010-10-20T15:39:33.223 回答