Flappy Bird

憤怒的小鳥這個遊戲非常經典，火了很長一段時間

我們可以不借助第三方庫進行實作，這裡隻是進行了一些簡單的實作

沒有添加碰撞檢測  完成了一些功能 我們點選螢幕小鳥會飛

如果不點選小鳥會落下 

這裡用到的技術也很簡單，用到了使用者互動，transform 動畫 

#import "BirdViewController.h"

//初速
const float MaxTime = 30;
//加速度 方向向下
const float VG = 0.05;
//初速度
const float MaxV = 2.5;
//初始化總路程
const float AllLength = 692;
typedef enum{
    GameStart,
    GamePlaying,
    GameOver
} GameState;
@interface BirdViewController ()
{
    NSTimer *birdTimer;
    //開始遊戲開關
    BOOL isStart;
    //遊戲狀态
    GameState gameState;
    //小鳥
    UIImageView *birdImgView;
    UIImageView *birdClotherView;
    //總場景
    UIView *playLayer;
    //跳躍時間
    float maxJumpTime;
}

@end

@implementation BirdViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor =[UIColor orangeColor];

    [self initBirdAndOther];
    birdTimer = [NSTimer scheduledTimerWithTimeInterval:0.008 target:self selector:@selector(update) userInfo:nil repeats:YES];
}

-(void)update
{
    //判斷
    if (isStart == YES && gameState == GamePlaying)
    {
        [self updateBird];
    }
}


-(void)initBirdAndOther
{
    playLayer = [[UIView alloc]initWithFrame:self.view.bounds];
    
    [self.view addSubview:playLayer];
    
    //添加手勢
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(screenTap)];
    [self.view addGestureRecognizer:tapGesture];
    
    birdClotherView = (UIImageView *)[[UIView alloc]initWithFrame:CGRectMake(60, 300, 40, 30)];
    
    [playLayer addSubview:birdClotherView];
    
    //初始化小鳥
    birdImgView = [[UIImageView alloc] init];
   
    birdImgView.frame = CGRectMake(0, 0, 40, 28);
    birdImgView.image = [UIImage imageNamed:@"bird"];
    [birdClotherView addSubview:birdImgView];
    
    UILabel *label = [[UILabel alloc]init];
    label.frame = CGRectMake(20, 30, 100, 30);
    label.text = @"憤怒的小鳥";
    [self.view addSubview:label];
 
    
}

-(void)screenTap
{
    //每點選一次
    maxJumpTime = MaxTime;
    if (isStart == NO) {
        isStart = YES;
        gameState = GamePlaying;
        for (UIView *tmp in self.view.subviews) {
            [tmp removeFromSuperview];
        }
        [self initBirdAndOther];
    }
    CGAffineTransform transform =  CGAffineTransformIdentity;
    birdImgView.transform = CGAffineTransformRotate(transform,  -30 * M_PI / 180 );
}

- (void) updateBird
{
    maxJumpTime --;
    CGRect rect = birdClotherView.frame;
    
    if (maxJumpTime >= 0)
    {
        rect.origin.y = rect.origin.y - (MaxV - (MaxTime - maxJumpTime)*VG);
    }
    else
    {
        //俯角30度旋轉
        CGAffineTransform transform = CGAffineTransformIdentity;
        birdImgView.transform = CGAffineTransformRotate(transform,  30 * M_PI / 180 );
        rect.origin.y = rect.origin.y - (maxJumpTime*VG);
    }
    birdClotherView.frame = rect;
   
}

@end