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)checkWithPaddle140 {141     if (CGRectIntersectsRect([_ballImage frame], [_paddleImage frame])) {142         _ballVelocity.y = -1 * abs(_ballVelocity.y);143         _ballVelocity.x += _deltaX;144     }145 }146 147 - (void)viewDidLoad148 {149     [super viewDidLoad];150     // Do any additional setup after loading the view, typically from a nib.151 }152 153 - (void)didReceiveMemoryWarning154 {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 *)sender161 {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 *)event180 {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 *)event193 {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:self201                                                  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