Question

调用[polygonShapeView setNeedsDisplay]时;我没有调用我的polygonShapeView drawRect方法。我能够做polygonShapeView.hidden = YES，这工作正常，所以我有一个很好的参考视图，并已连接我的插座。有什么想法吗？

或者Controller.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

Controller.m或者

//
//  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

Answer 1

我只能猜测，但似乎您的polygonShapeView没有以任何方式与polygonShape相关联。所以它可能会画，但不是根据你期望的数据。

我认为在polygonShapeView.shape = polygonShape;或awakeFromNib中应该有类似updateInterface的内容。

setNeedsDisplay不更新界面

1 个答案: