Question

我正在尝试构建一个玩家向右移动的游戏。我也希望背景在玩家运动的相反方向移动。怎么实现这个？我需要它看起来像飞扬的鸟背景。我没有使用spriteKit或swift。错误一直显示＆＃34;整数常量＆＃34;上的无效后缀xscreenwidth。

我希望它看起来像这样的背景http://www.youtube.com/watch?v=RkGUk40LkrQ但我唯一能找到的就是spriteKit。

我在UIKit中需要它到目前为止我有这个：

它说没有可见的@interface for UIView声明了选择器initWithImage，没有可见的@interface用于UIView声明选择器addSubView，并且没有可见的@interface用于UIView声明选择器beginTheAnimation

#import "Game.h"    
#import <AVFoundation/AVFoundation.h>

@interface Game ()

{

    AVAudioPlayer *_soundEffect;

}

@property (nonatomic) int screenHeight;    
@property (nonatomic) int screenWidth;

@end

@implementation Game

-(int)screenHeight{
    return self.view.frame.size.height;
}

-(int)screenWidth{
    return self.view.frame.size.width;
}


//Preparation
-(void)prepareToAnimate{

    CGRect startingPosition = CGRectMake(0,0,2xscreenWidth,screenHeight);
    //You will need to define a variable for your screenWidth and screenHeight

    UIImage *image = [UIImage imageNamed:@"bgtest2.png"];
    //Add your image name here. It should be a double image (i.e. the whole image that fits on an iphone screen next to a duplicate of itself so that it is twice the width)

    UIImageView *imageView = [[UIView alloc] initWithImage:image];

    [self addSubView:imageView];
    [self beginTheAnimation];

}

Answer 1

乘法运算符为*，而不是x。显示错误是因为您在此行中有2xscreenWidth：

CGRect startingPosition = CGRectMake(0,0,2xscreenWidth,screenHeight);

将其更改为：

CGRect startingPosition = CGRectMake(0,0,2*screenWidth,screenHeight);

如何制作滚动背景。 Objective-C的

1 个答案: