我在XCode上制作了第二个游戏，但代码似乎有问题。它是一个太空射击游戏，玩家跟随你的手指，然后点击释放导弹。问题是......当我按下“开始游戏”时，一切都是隐藏的，不会弹出。这是我的viewcontroller.h和viewcontroller.m
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
int score;
int lives;
int enemyAttackOccurence;
int enemyPosition;
int randomSpeed;
float enemySpeed;
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
@implementation PlayViewController
-(void)viewDidAppear:(BOOL)animated {
// Images that are to be hidden
playerShip.hidden = YES;
enemyShip.hidden = YES;
missile.hidden = YES;
earth.hidden = YES;
// Hidden Labels
scoreLabel.hidden = YES;
livesLabel.hidden = YES;
// Set score and lives remaining
score = 0;
lives = 0;
// Strings
scoreString = [NSString stringWithFormat:@"Score: 0"];
liveString = [NSString stringWithFormat:@"Lives: 0"];
// Initial Label Text
scoreLabel.text = scoreString;
livesLabel.text = liveString;
// Image starting positions
playerShip.center = CGPointMake(150, 658);
enemyShip.center = CGPointMake(175, 20);
missile.center = CGPointMake(playerShip.center.x, playerShip.center.y);
}
-(IBAction)startGame:(id)sender {
// Hide buttons
startButton.hidden = YES;
exitButton.hidden = YES;
// Images to show
playerShip.hidden = NO;
enemyShip.hidden = NO;
earth.hidden = NO;
// Labels
scoreLabel.hidden = NO;
livesLabel.hidden = NO;
[self positionEnemy];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
playerShip.center = CGPointMake(point.x, playerShip.center.y);
}
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
[missileMovementTimer invalidate];
missile.hidden = NO;
missile.center = CGPointMake(playerShip.center.x, playerShip.center.y);
missileMovementTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(missileMovement) userInfo:nil repeats:YES];
}
-(void)positionEnemy {
// Random enemy position
enemyPosition = arc4random() % 249;
enemyPosition = enemyPosition + 20;
// Enemy Image Location
enemyShip.center = CGPointMake(enemyPosition, -40);
// Set enemy speed
randomSpeed = arc4random() % 3;
switch (randomSpeed) {
case 0:
enemySpeed = 0.03;
break;
case 1:
enemySpeed = 0.02;
break;
case 2:
enemySpeed = 0.01;
default:
break;
}
enemyAttackOccurence = arc4random() % 5;
[self performSelector:@selector(enemyMovementTimerMethod) withObject:nil afterDelay:enemyAttackOccurence];
}
-(void)enemyMovementTimerMethod {
enemyMovementTimer = [NSTimer scheduledTimerWithTimeInterval:enemySpeed target:self selector:@selector(enemyMovement) userInfo:nil repeats:YES];
}
-(void)enemyMovement {
enemyShip.center = CGPointMake(enemyShip.center.x, enemyShip.center.y + 2);
if (CGRectIntersectsRect(enemyShip.frame, earth.frame)) {
lives = lives - 1;
liveString = [NSString stringWithFormat:@"Lives: %i", lives];
livesLabel.text = liveString;
// Stop Enemy Moving
[enemyMovementTimer invalidate];
if (lives > 0) {
[self positionEnemy];
}
if (lives == 0) {
[self gameOver];
}
}
}
-(void)missileMovement {
missile.hidden = NO;
missile.center = CGPointMake(missile.center.x, missile.center.y - 2);
if (CGRectIntersectsRect(missile.frame, enemyShip.frame)) {
score = score + 1;
scoreString = [NSString stringWithFormat:@"Score: %i", score];
scoreLabel.text = scoreString;
// Stop missile
[missileMovementTimer invalidate];
// Position missile to be at the playerShip's center
missile.center = CGPointMake(playerShip.center.x, playerShip.center.y);
missile.hidden = YES;
// Stop enemy movement
[enemyMovementTimer invalidate];
[self positionEnemy];
}
}
-(void)gameOver {
[enemyMovementTimer invalidate];
[missileMovementTimer invalidate];
[self performSelector:@selector(gameReplay) withObject:nil afterDelay:3];
}
-(void) gameReplay {
// Images that are to be hidden
playerShip.hidden = YES;
enemyShip.hidden = YES;
missile.hidden = YES;
earth.hidden = YES;
// Hidden Labels
scoreLabel.hidden = YES;
livesLabel.hidden = YES;
// Set score and lives remaining
score = 0;
lives = 0;
// Strings
scoreString = [NSString stringWithFormat:@"Score: 0"];
liveString = [NSString stringWithFormat:@"Lives: 0"];
// Initial Label Text
scoreLabel.text = scoreString;
livesLabel.text = liveString;
// Image starting positions
playerShip.center = CGPointMake(150, 658);
enemyShip.center = CGPointMake(175, 20);
missile.center = CGPointMake(playerShip.center.x, playerShip.center.y);
}
@end
ViewController.h（仅供备份）
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController {
IBOutlet UIButton *startGame;
}
@end
@interface PlayViewController : UIViewController {
IBOutlet UIImageView *playerShip;
IBOutlet UIImageView *enemyShip;
IBOutlet UIImageView *missile;
IBOutlet UIImageView *earth;
IBOutlet UILabel *livesLabel;
IBOutlet UILabel *scoreLabel;
IBOutlet UIButton *startButton;
IBOutlet UIButton *exitButton;
UITouch *touch;
NSString *liveString;
NSString *scoreString;
NSTimer *enemyMovementTimer;
NSTimer *missileMovementTimer;
}
-(IBAction)startGame:(id)sender;
@end
我正在观看这个游戏的教程，创建的人没有回复。请帮忙 - 我不能再具体了。它必须是代码中的一个奇怪的差距。感谢。
答案 0 :(得分：1)
此外，您还为StartGame按钮设置了IBOutlet和IBAction。您似乎永远不会使用的IBOutlet。您可能会因为UIButton的IBOutlet和IBAction具有相同的名称而混淆您的编译器。删除IBOutlet，或正确更改名称，看看是否有任何改变。
答案 1 :(得分：0)
我建议您在设置object.hidden = YES和object.hidden = NO时弄乱您的代码行，看看会发生什么。通常，篡改和测试代码是查看正在发生的事情的好方法。确保为UIImageViews设置了图像。我假设它们已在您的界面构建器中设置，因为我看不到您在代码中设置它们的位置。如果没有为UIImageViews设置图像，除非给定特定颜色，否则它们将是透视的。如果篡改代码不起作用，重新观看教程并确保没有弄乱任何东西也不会有害。通常我们观看的教程都已过时，我们只能自己解决一个小问题，这可能是也可能不是这些实例之一。但是，再次测试你的代码，看看当你按下那个按钮时，事情是否真的被设置为隐藏。