打砖块

  1 //
  2 //  ViewController.m
  3 //  Blocks
  4 //
  5 //  Created by apple on 13-7-5.
  6 //  Copyright (c) 2013年 itcast. All rights reserved.
  7 //
  8
  9 #import "ViewController.h"
 10 #import <QuartzCore/QuartzCore.h>
 11
 12 @interface ViewController ()
 13 {
 14     // 游戏开始的标示
 15     BOOL _isPlaying;
 16
 17     // 小球的速度
 18     CGPoint _ballVelocity;
 19
 20     // 游戏时钟
 21     CADisplayLink *_gameTimer;
 22
 23     // 水平位移
 24     CGFloat _deltaX;
 25 }
 26
 27 // 时钟触发方法
 28 - (void)step:(CADisplayLink *)sender;
 29
 30 // 检测与屏幕的碰撞
 31 - (BOOL)checkWithScreen;
 32 // 检测与砖块的碰撞
 33 - (BOOL)checkWithBlocks;
 34 // 检测与挡板的碰撞
 35 - (void)checkWithPaddle;
 36
 37 // 重置游戏状态，胜利、失败
 38 - (void)resetGameStatusWithMessage:(NSString *)message;
 39
 40 @end
 41
 42 @implementation ViewController
 43
 44 - (void)resetGameStatusWithMessage:(NSString *)message
 45 {
 46     NSLog(@"%@", message);
 47
 48     [_gameTimer invalidate];
 49
 50     // 将所有的砖头设置成可见
 51     for (UIImageView *block in _blockImages) {
 52         [block setHidden:NO];
 53         // 将透明度设置为0
 54         [block setAlpha:0];
 55         [block setFrame:CGRectMake(block.center.x, block.center.y, 0, 0)];
 56     }
 57     [UIView animateWithDuration:2.0 animations:^{
 58         for (UIImageView *block in _blockImages) {
 59             // 将透明度设置为0
 60             [block setAlpha:1];
 61             [block setFrame:CGRectMake(block.center.x - 32, block.center.y - 10, 64, 20)];
 62
 63         }
 64     } completion:^(BOOL finished) {
 65         _isPlaying = NO;
 66
 67         [_ballImage setCenter:CGPointMake(160, 430)];
 68         [_paddleImage setCenter:CGPointMake(160, 450)];
 69
 70     }];
 71 }
 72
 73 // 屏幕碰撞检测
 74 - (BOOL)checkWithScreen
 75 {
 76     BOOL gameOver = NO;
 77
 78     // 左边
 79     if ([_ballImage frame].origin.x <= 0) {
 80         _ballVelocity.x = abs(_ballVelocity.x);
 81     }
 82     // 右边
 83     if ([_ballImage frame].origin.x + [_ballImage frame].size.width >= self.view.frame.size.width) {
 84         _ballVelocity.x = -1 * abs(_ballVelocity.x);
 85     }
 86     // 顶部
 87     if ([_ballImage frame].origin.y <= 0) {
 88         _ballVelocity.y = abs(_ballVelocity.y);
 89     }
 90     // 底部
 91     if ([_ballImage frame].origin.y + [_ballImage frame].size.height >= self.view.frame.size.height) {
 92         gameOver = YES;
 93     }
 94
 95     return gameOver;
 96 }
 97
 98 - (BOOL)checkWithBlocks
 99 {
100     // 砖块的碰撞检测
101     for (UIImageView *block in _blockImages) {
102         // 如果与砖块碰撞，那么隐藏砖块
103         if (CGRectIntersectsRect([block frame], [_ballImage frame])
104             && ![block isHidden]) {
105
106             [block setHidden:YES];
107
108             _ballVelocity.y = abs(_ballVelocity.y);
109
110             break;
111         }
112     }
113
114     // 判断游戏胜利
115     BOOL gameWin = YES;
116
117     for (UIImageView *block in _blockImages) {
118         if (![block isHidden]) {
119             gameWin = NO;
120             break;
121         }
122     }
123
124 //    int count = 0;
125 //    for (UIImageView *block in _blockImages) {
126 //        if ([block isHidden]) {
127 //            count++;
128 //        }
129 //    }
130 //
131 //    if (count == [_blockImages count] - 1) {
132 //        gameWin = YES;
133 //    }
134
135     return gameWin;
136 }
137
138 // 挡板的碰撞
139 - (void)checkWithPaddle
140 {
141     if (CGRectIntersectsRect([_ballImage frame], [_paddleImage frame])) {
142         _ballVelocity.y = -1 * abs(_ballVelocity.y);
143         _ballVelocity.x += _deltaX;
144     }
145 }
146
147 - (void)viewDidLoad
148 {
149     [super viewDidLoad];
150     // Do any additional setup after loading the view, typically from a nib.
151 }
152
153 - (void)didReceiveMemoryWarning
154 {
155     [super didReceiveMemoryWarning];
156     // Dispose of any resources that can be recreated.
157 }
158
159 // 时钟处理方法
160 - (void)step:(CADisplayLink *)sender
161 {
162 //    NSLog(@"运行了!!!");
163     // 检测屏幕碰撞
164     if ([self checkWithScreen]) {
165         [self resetGameStatusWithMessage:@"再来一次吧！"];
166     }
167     // 砖块的碰撞
168     if ([self checkWithBlocks]) {
169         [self resetGameStatusWithMessage:@"你真棒！"];
170     }
171     [self checkWithPaddle];
172
173     // 让小球动起来
174     [_ballImage setCenter:CGPointMake(_ballImage.center.x + _ballVelocity.x,
175                                       _ballImage.center.y + _ballVelocity.y)];
176
177 }
178
179 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
180 {
181     if (_isPlaying) {
182         UITouch *touch = [touches anyObject];
183
184         // 计算手指在水平方向的移动距离
185         _deltaX = [touch locationInView:self.view].x - [touch previousLocationInView:self.view].x;
186
187         // 修改挡板位置
188         [_paddleImage setCenter:CGPointMake([_paddleImage center].x + _deltaX, [_paddleImage center].y)];
189     }
190 }
191
192 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
193 {
194     // 如果游戏还没有开始
195     if (!_isPlaying) {
196         // 小球的初始状态
197         _ballVelocity = CGPointMake(0, -5);
198
199         // 定义时钟
200         _gameTimer = [CADisplayLink displayLinkWithTarget:self
201                                                  selector:@selector(step:)];
202
203         // 将当前时钟添加到应用循环
204         [_gameTimer addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
205
206         // 修改游戏状态标示
207         _isPlaying = YES;
208     } else {
209         _deltaX = 0;
210     }
211 }
212
213 @end