Objective c setNeedsDisplay未更新接口

调用[polygonShapeView setNeedsDisplay]时；未调用我的polygonShapeView drawRect方法。我可以做polygonShapeView.hidden=是的，它工作得很好，因此我有一个很好的视图参考，并且已经连接了我的插座。有什么想法吗

控制器.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "PolygonShape.h"
#import "PolygonShapeView.h"

@interface Controller : NSObject {
    IBOutlet UIButton *decreaseButton;
    IBOutlet UIButton *increaseButton;
    IBOutlet UILabel *numberOfSidesLabel;
    IBOutlet PolygonShape *polygonShape;
    IBOutlet PolygonShapeView *polygonShapeView;
    IBOutlet UILabel *polygonLabel; 
}
- (IBAction)decrease:(id)sender;
- (IBAction)increase:(id)sender;
- (void)awakeFromNib;
- (void)updateInterface;
@end

我只能猜测，但您的

polygonShapeView

似乎没有以任何方式链接到

polygonShape

。所以它可能会画，但不是根据你期望的数据

---

我认为应该有类似于

polygonShapeView.shape=polygonShape

在

awakeFromNib

中，或者在

updateInterface

中，结果是我在awakeFromNib中创建了一个新的多边形形状，而不是使用我在nib中创建的多边形形状，这没有导致任何真正的更改。确切地说，因此没有连接。：）

//
//  Controller.m
//
//  Created by Chris Muench on 6/24/11.
//  Copyright 2011 N/A. All rights reserved.
//

#import "Controller.h"

@implementation Controller
- (IBAction)decrease:(id)sender 
{
    [polygonShape setNumberOfSides:numberOfSidesLabel.text.integerValue - 1];
    [self updateInterface];
}

- (IBAction)increase:(id)sender 
{
    [polygonShape setNumberOfSides:numberOfSidesLabel.text.integerValue + 1];
    [self updateInterface];
}

- (void)awakeFromNib 
{
    polygonShape = [[PolygonShape alloc] initWithNumberOfSides:numberOfSidesLabel.text.integerValue minimumNumberOfSides:3 maximumNumberOfSides:12];
    [self updateInterface];
}
- (void)updateInterface 
{
    [polygonShapeView setNeedsDisplay];
    numberOfSidesLabel.text = [NSString stringWithFormat:@"%d",polygonShape.numberOfSides];
    polygonLabel.text = polygonShape.name; 

    if (polygonShape.numberOfSides == polygonShape.maximumNumberOfSides)
    {
        increaseButton.enabled = NO;
    }
    else
    {
        increaseButton.enabled = YES;
    }

    if(polygonShape.numberOfSides == polygonShape.minimumNumberOfSides)
    {
        decreaseButton.enabled = NO;
    }
    else
    {
        decreaseButton.enabled = YES;
    }
}
@end