Question

我试图在互联网上找到答案（这个网站也是如此），但我找不到正确的答案。

我试图给按钮一个动画，所以我使用了QuartzCore Framework。但是每当我想玩它时，它就会给我带来烦人的按摩：在界面中找不到属性'newGameButton'的声明。我不知道我做错了什么或我现在要做什么。

这是我的.h和.m文件：

.h文件：

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

@interface MainMenuViewController : UIViewController {

    IBOutlet UIButton* newGameButton;
    IBOutlet UIButton* statsButton;
    IBOutlet UIButton* settingsButton;

    CAKeyframeAnimation* popAnimation;

}
-(IBAction) newGame:(id)sender;
-(IBAction) showStats:(id)sender;
-(IBAction) showSettings:(id)sender;
@end

.m文件：

#import "MainMenuViewController.h"
#import "TrafficAppDelegate.h"
#import "TrafficViewController.h"

@implementation MainMenuViewController


-(IBAction) newGame:(id)sender{
    TrafficViewController* traffic = [[TrafficViewController alloc] initWithNibName:@"TrafficViewController" bundle:nil];
    [self.navigationController pushViewController:traffic animated:NO];
}

-(IBAction) showStats:(id)sender{
}
-(IBAction) showSettings:(id)sender{
}

@synthesize newGameButton, statsButton, settingsButton; (This is the error causer!)

-(void)viewDidLoad{

    [super viewDidLoad];

    popAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];

    popAnimation.keyTimes = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:0.7], [NSNumber numberWithFloat:1.0], nil];
    popAnimation.values = [NSArray arrayWithObjects: [NSNumber numberWithFloat:0.01], [NSNumber numberWithFloat:1.1], [NSNumber numberWithFloat:1.0], nil];


    [popAnimation retain];

}

-(void)popView:(UIView*)view{
    [view setHidden:NO];
    [[view layer] addAnimation:popAnimation forKey:@"transform.scale"];
}

-(void)viewWillAppear:(BOOL)animated{
    [popAnimation setDuration:0.3];
    [newGameButton setHidden:YES];
    [statsButton setHidden:YES];
    [settingsButton setHidden:YES];
    [self performSelector:@selector(popView:) withObject:newGameButton afterDelay:0.25];
    [self performSelector:@selector(popView:) withObject:statsButton afterDelay:0.3];
    [self performSelector:@selector(popView:) withObject:settingsButton afterDelay:0.35];
}

@end

我完全无能为力，所以请帮忙！

Answer 1

错误是自描述的 - 您需要声明在类接口中合成的属性，例如：

@interface MainMenuViewController : UIViewController {
   ...
}
...
@property (nonatomic, retain) IBOutlet UIButton* settingsButton;

@end

我建议（重新）阅读Objective-c reference docs

中的属性

Answer 2

您正在尝试访问一个根本不存在的属性。

查看您的@interface，您看到任何@property声明吗？

这将有效：

@interface MainMenuViewController : UIViewController {

    IBOutlet UIButton* newGameButton;
    IBOutlet UIButton* statsButton;
    IBOutlet UIButton* settingsButton;

    CAKeyframeAnimation* popAnimation;

}

@property (nonatomic, retain) IBOutlet UIButton *newGameButton, *statsButton, *settingsButton;

在界面中找不到属性'newGameButton'的声明

2 个答案: