我是编程新手，并开始构建一个皮划艇运动员在河流中划皮划艇的应用程序。该应用程序有两张图像，一张在屏幕左侧，一张在右侧，用于检测向上滑动手势，该手势会导致皮划艇运动员在每一侧向上或向下划行。有一些岩石，每次计时器运行时都会不断增加岩石的“y”位置，从而产生他们是皮划艇运动员正在向它们移动的错觉，而实际上它们是向下移动的。问题是，一切正常，但是当手势由于某种原因被激活时，岩石重新出现在顶部并再次开始向下移动。谁能向我解释为什么会发生这种情况以及如何解决它？非常感谢。
这是 .h 文件上的代码：
#import <UIKit/UIKit.h>
@interface WRViewController : UIViewController <UIGestureRecognizerDelegate> {
//Image View for the game mode
UIImageView *bg;
UIImageView *player;
UIImageView *rock1;
UIImageView *rock2;
UIImageView *rock3;
UIImageView *con_left;
UIImageView *con_right;
NSInteger gameState;
CGPoint rocksOnCurrent;
CGPoint current;
NSArray * lRowUpArray;
NSArray * lRowDownArray;
NSArray * rRowUpArray;
NSArray * rRowDownArray;
}
@property (nonatomic, retain) IBOutlet UIImageView *bg;
@property (nonatomic, retain) IBOutlet UIImageView *player;
@property (nonatomic, retain) IBOutlet UIImageView *rock1;
@property (nonatomic, retain) IBOutlet UIImageView *rock2;
@property (nonatomic, retain) IBOutlet UIImageView *rock3;
@property (nonatomic, retain) IBOutlet UIImageView *con_left;
@property (nonatomic, retain) IBOutlet UIImageView *con_right;
@property (nonatomic) NSInteger gameState;
@property (nonatomic) CGPoint rocksOnCurrent;
@property (nonatomic) CGPoint current;
@property (nonatomic, retain) NSArray *lRowUpArray;
@property (nonatomic, retain) NSArray *lRowDownArray;
@property (nonatomic, retain) NSArray *rRowUpArray;
@property (nonatomic, retain) NSArray *rRowDownArray;
-(void)gameStatePlayNormal;
-(void) swipe_leftUp;
-(void) swipe_leftDown;
-(void) swipe_rightUp;
-(void) swipe_rightDown;
@end
这是 .m 文件中的内容：#import "WRViewController.h"
@interface WRViewController ()
@end
#define kStateRunning 1
#define kStateGameOver 2
#define kCurrent 0.0045
@implementation WRViewController
@synthesize bg, player, rock1, rock2, rock3;
@synthesize con_left, con_right;
@synthesize gameState;
@synthesize rocksOnCurrent, current;
@synthesize lRowUpArray, lRowDownArray, rRowUpArray, rRowDownArray;
//Gesture actions called by gesture recognizers upon activation
-(void) swipe_leftDown{// The array inside is not causing the restarting
NSArray * lRowDownArray = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"k_lf1.png"],
[UIImage imageNamed:@"k_lf2.png"],
[UIImage imageNamed:@"k_lf3.png"],
[UIImage imageNamed:@"k_lf4.png"],
[UIImage imageNamed:@"k_lf5.png"],
[UIImage imageNamed:@"k_lf6.png"],
[UIImage imageNamed:@"k_lf7.png"],
[UIImage imageNamed:@"k_lf8.png"],
[UIImage imageNamed:@"k_lf9.png"],
[UIImage imageNamed:@"k_lf10.png"],
[UIImage imageNamed:@"k_lf11.png"],
[UIImage imageNamed:@"k_lf12.png"], nil];
player.animationImages = lRowDownArray;
[player setAnimationRepeatCount:1];
player.animationDuration = 1.1;
player.contentMode = UIViewContentModeBottomLeft;
[self.view addSubview:player];
[player startAnimating];
rock1.center = CGPointMake(rock1.center.x, rock1.center.y + rocksOnCurrent.y);
rocksOnCurrent.x -= 0.4;
rocksOnCurrent.y += 0.4;
}
-(void) swipe_leftUp{
NSArray * lRowUpArray = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"k_lf12.png"],
[UIImage imageNamed:@"k_lf11.png"],
[UIImage imageNamed:@"k_lf10.png"],
[UIImage imageNamed:@"k_lf9.png"],
[UIImage imageNamed:@"k_lf8.png"],
[UIImage imageNamed:@"k_lf7.png"],
[UIImage imageNamed:@"k_lf6.png"],
[UIImage imageNamed:@"k_lf5.png"],
[UIImage imageNamed:@"k_lf4.png"],
[UIImage imageNamed:@"k_lf3.png"],
[UIImage imageNamed:@"k_lf2.png"],
[UIImage imageNamed:@"k_lf1.png"], nil];
player.animationImages = lRowUpArray;
[player setAnimationRepeatCount:1];
player.animationDuration = 1.1;
player.contentMode = UIViewContentModeBottomLeft;
//[self.view addSubview:player];
[player startAnimating];
}
//Did the above to swipe_RightDown and swipe_RightUp. Didn't add here to save space.
-(NSString *)pathOfFile{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
NSString *documentFolder = [paths objectAtIndex:0];
return [documentFolder stringByAppendingFormat:@"saverFile.plist"];
}
- (void)viewDidLoad{
[super viewDidLoad];
gameState = kStateRunning;
rocksOnCurrent = CGPointMake(0, 0);
current = CGPointMake (0, kCurrent);
[NSTimer scheduledTimerWithTimeInterval:1.0/60 target:self selector:@selector(gameLoop) userInfo:nil repeats:YES];
/////Gesture code for the row controllers
//Left Row Up
UISwipeGestureRecognizer *con_leftUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe_leftUp)];
con_leftUp.numberOfTouchesRequired = 1;
con_leftUp.direction = UISwipeGestureRecognizerDirectionUp;
[self.con_left addGestureRecognizer:con_leftUp];
//Left Row Down
UISwipeGestureRecognizer *con_leftDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe_leftDown)];
con_leftDown.numberOfTouchesRequired = 1;
con_leftDown.direction = UISwipeGestureRecognizerDirectionDown;
[self.con_left addGestureRecognizer:con_leftDown];
//Right Row Up
UISwipeGestureRecognizer *con_rightUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe_rightUp)];
con_rightUp.numberOfTouchesRequired = 1;
con_rightUp.direction = UISwipeGestureRecognizerDirectionUp;
[self.con_right addGestureRecognizer:con_rightUp];
//Right Row Down
UISwipeGestureRecognizer *con_rightDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe_rightDown)];
con_rightDown.numberOfTouchesRequired = 1;
con_rightDown.direction = UISwipeGestureRecognizerDirectionDown;
[self.con_right addGestureRecognizer:con_rightDown];
}
-(void)gameLoop {
if (gameState == kStateRunning){
[self gameStatePlayNormal];
} else if (gameState == kStateGameOver){
}
}
//Extra functions, so that they are not all in the game loop
-(void)gameStatePlayNormal{
rocksOnCurrent.y += current.y;
rock1.center = CGPointMake(rock1.center.x, rock1.center.y + rocksOnCurrent.y);
rock2.center = CGPointMake(rock2.center.x, rock2.center.y + rocksOnCurrent.y);
rock3.center = CGPointMake(rock3.center.x, rock3.center.y + rocksOnCurrent.y);
}
-(void)viewDidUnload {
self.bg = nil;
self.player = nil;
self.rock1 = nil;
self.rock2 = nil;
self.rock3 = nil;
}
//Apple does not requires this, it seems.
/*-(void)dealloc {
[super dealloc];
[bg release];
[rock1 release];
[rock2 release];
[rock3 release];
}*/
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
简而言之，每当我激活一个手势时，岩石就会回到原来的位置，就像重新启动一样。RocksOnCurrent.y 保持不变，因为每次我滑动时岩石的速度似乎都移动得更快。任何帮助将不胜感激，谢谢。