Question

我正在创建一个简单的游戏，但遇到了一些代码问题。游戏的工作方式是有两个球。一个是敌人，一个是玩家。每5秒钟游戏将难度提高到一个新的水平。我当前的代码是here，并在下面复制：

//
//  ViewController.m
//  BakerBattle
//
//  Created by Cole Bergmann on 2/6/13.
//  Copyright (c) 2013 Cole Bergmann. All rights reserved.
//

#import "ViewController.h"
#import "SecondView.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    //(X speed, Y speed) vvv
    pos = CGPointMake(6,5);
    [three setHidden:YES];
    [two setHidden:YES];
    [one setHidden:YES];
    [go setHidden:YES];
    [level1 setHidden:YES];
    [level2 setHidden:YES];
    [level3 setHidden:YES];
}

-(IBAction)start {
    [startbutton setHidden:YES];
    [logo setHidden:YES];
    [instructions setHidden:YES];
    [self performSelector:@selector(three) withObject:nil afterDelay:0.5];

}

-(void)three {
    [three setHidden:NO];
    [self performSelector:@selector(two) withObject:nil afterDelay:0.5];
}

-(void)two {
    [two setHidden:NO];
    [self performSelector:@selector(one) withObject:nil afterDelay:0.5];
}

-(void)one {
    [one setHidden:NO];
    [self performSelector:@selector(go) withObject:nil afterDelay:0.5];
}

-(void)go {
    [go setHidden:NO];
    [self performSelector:@selector(gamestart) withObject:nil afterDelay:0.5];
}

-(void)gamestart {
    [level1 setHidden:NO];
    [three setHidden:YES];
    [two setHidden:YES];
    [one setHidden:YES];
    [go setHidden:YES];
    [logo setHidden:YES];
    pos = CGPointMake(6,5);
    randomMain = [NSTimer scheduledTimerWithTimeInterval:(0.03) target:self selector:@selector(onTimer) userInfo:nil repeats:YES];
    [self performSelector:@selector(difficulty2) withObject:nil afterDelay:5.0];
}

-(void)onTimer {
    [self checkCollision];

    enemy.center = CGPointMake(enemy.center.x+pos.x,enemy.center.y+pos.y);
    if (enemy.center.x > 320 || enemy.center.x < 0)
        pos.x = -pos.x;
    if (enemy.center.y > 480 || enemy.center.y < 0)
        pos.y = -pos.y;
}

-(void)checkCollision {
    if( CGRectIntersectsRect(player.frame,enemy.frame))
    {
        [randomMain invalidate];
        [startbutton setHidden:NO];
        [logo setHidden:NO];
        [three setHidden:YES];
        [two setHidden:YES];
        [one setHidden:YES];
        [go setHidden:YES];
        [level1 setHidden:YES];
        [level2 setHidden:YES];
        [level3 setHidden:YES];
        [instructions setHidden:NO];

        CGRect frame = [player frame];
        frame.origin.x = 137.0f;
        frame.origin.y = 326.0;
        [player setFrame:frame];

        CGRect frame2 = [enemy frame];
        frame2.origin.x = 137.0f;
        frame2.origin.y = 20.0;
        [enemy setFrame:frame2];

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"You Lost!" message:[NSString stringWithFormat:@"Baker Cat stole your dough!"] delegate:nil cancelButtonTitle:@"I want a rematch!" otherButtonTitles:nil];
        [alert show];
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *myTouch = [[event allTouches] anyObject];
    player.center = [myTouch locationInView:self.view];
}

//##################################-[DIFFICULTY LEVELS]-##############################################\\

-(void)difficulty2 {
    [level1 setHidden:YES];
    pos = CGPointMake(10,8);
    [self performSelector:@selector(difficulty3) withObject:nil afterDelay:5.0];
    [level2 setHidden:NO];

}

-(void)difficulty3 {
    [level2 setHidden:YES];
    pos = CGPointMake(14,10);
    [self performSelector:@selector(win) withObject:nil afterDelay:5.0];
    [level3 setHidden:NO];

}

-(void)win {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"You Won!" message:[NSString stringWithFormat:@"You defeated Baker Cat!"] delegate:nil cancelButtonTitle:@"Play Again" otherButtonTitles:nil];
    [alert show];
    [randomMain invalidate];
    [startbutton setHidden:NO];
    [logo setHidden:NO];
    [instructions setHidden:NO];
    [three setHidden:YES];
    [two setHidden:YES];
    [one setHidden:YES];
    [go setHidden:YES];
    [level1 setHidden:YES];
    [level2 setHidden:YES];
    [level3 setHidden:YES];

    CGRect frame = [player frame];
    frame.origin.x = 137.0f;
    frame.origin.y = 326.0;
    [player setFrame:frame];

    CGRect frame2 = [enemy frame];
    frame2.origin.x = 137.0f;
    frame2.origin.y = 20.0;
    [enemy setFrame:frame2];
}

@end

我想知道是否有人知道另一种方法来定义关卡。基本上，不同级别必须做的唯一事情是pos = CGPointMake(10,8);并将我的levelText更改为游戏所在的级别。

我现在使用的问题是，如果玩家输了，等级不会被重置。例如，如果有人在2级死亡，他们将获得死亡消息并进入标题屏幕，但在屏幕顶部显示“3级”后不久，并发送消息说玩家赢了。任何帮助将不胜感激。

Answer 1

延迟后执行选择器但从不取消选择器。你有很多不同的方法名称，因此选择器取消可能不可行，因此更快的解决方案（可能有更多的副作用）是将以下代码添加到任何终止游戏状态的方法（并且可能转换为新的水平）：

[NSObject cancelPreviousPerformRequestsWithTarget:self];

如果您需要通过选择器取消，请查看+cancelPreviousPerformRequestsWithTarget:(id)aTarget selector:(SEL)aSelector object:(id)anArgument]。

替代等级难度

1 个答案: