iOS实现浮动泡泡功能，悬浮泡泡，windows系统屏幕保护程序的气泡功能(碰撞检测)

来源：互联网发布：立极尺绘图罗盘软件编辑：程序博客网时间：2024/05/01 06:31

使用到的知识点有

1.block封装NSTimer

2.随机生成0-X之间的正数

3.两个frame是否有交集:CGRectIntersectsRect

4.随机生成-1~1之间的浮点数

5.CGPoint存储在NSArray里，从NSArray里读取

6.计算两个point的距离(碰撞检测)

类似的效果：打方块，台球。

效果图

开始

1.随机生成三个中心点坐标，三个移动方向。要求：在屏幕范围内、三个btn没有交集

    __block BOOL isX = NO;        int width = SCREEN_WIDTH_NEW;    int height = SCREEN_HEIGHT_NEW;        NSMutableArray *ballArray = [[NSMutableArray alloc]initWithCapacity:3];    NSMutableArray *ballDirectionArray = [[NSMutableArray alloc]initWithCapacity:3];            for (int i = 0; i < 3; i++) {        //随机生成3个center                BOOL qualified = NO;                int cx = 0;        int cy = 0;                while (!qualified) {                        cx = arc4random() % width;            cy = arc4random() % height;                                    //不重叠            BOOL containsPoint = NO;            for (int j = 0; j < ballArray.count; j++) {                                UIButton *btnn = ballArray[j];                                if (CGRectIntersectsRect(btnn.frame,CGRectMake(cx  , cy  , BALL_WIDTH, BALL_WIDTH))) {                    containsPoint = YES;                }            }                        //在屏幕范围内            if (cx > BALL_WIDTH && cy > BALL_WIDTH  && cx < SCREEN_WIDTH_NEW - BALL_WIDTH  && cy < SCREEN_WIDTH_NEW - BALL_WIDTH && containsPoint == NO) {                                qualified = YES;            }else{                continue;            }                        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];            [btn setImage:[UIImage imageNamed:[NSString stringWithFormat:@"0%ddog",i]] forState:UIControlStateNormal];            //btn.backgroundColor = [UIColor redColor];            btn.centerY = cy;            btn.centerX = cx;            btn.width = 70;            btn.height = 70;            [self.view addSubview:btn];                        [ballArray addObject:btn];                        NSLog(@"%@ %@",NSStringFromCGRect(btn.frame) ,NSStringFromCGRect( CGRectMake(cx  , cy  , BALL_WIDTH, BALL_WIDTH)));                    }                                //随机生成3个移动方向        double randomX = (double)arc4random() / ARC4RAND_MAX * 2.0f - 1.0f;        double randomY = (double)arc4random() / ARC4RAND_MAX * 2.0f - 1.0f;        NSLog(@"%f %f",randomX,randomY);                [ballDirectionArray addObject:[NSValue valueWithCGPoint:CGPointMake(randomX, randomY)]];                            }

2.使用定时器使其“漂浮”并且碰到屏幕边缘或其他的btn要弹回

        //    0.03    //>ios10    //    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.003 repeats:YES block:^(NSTimer * _Nonnull timer) {        //        <ios10    NSTimer *timerL = [NSTimer scheduledTimerWithTimeInterval:0.003 block:^{                                for (int j = 0; j < ballArray.count; j++) {            UIButton *btn = ballArray[j];            NSValue *val = [ballDirectionArray objectAtIndex:j];            CGPoint p = [val CGPointValue];                        //移动方向            __block  float vx = p.x;            __block float vy = p.y;                        //掉头            if (btn.right > SCREEN_WIDTH_NEW  || btn.left < 0) {                vx = -vx;                CGPoint p = [val CGPointValue];                p.x = vx;                [ballDirectionArray setObject:[NSValue valueWithCGPoint:p] atIndexedSubscript:j];            }            if (btn.bottom > SCREEN_HEIGHT_NEW || btn.top <0) {                vy = -vy;                CGPoint p = [val CGPointValue];                p.y = vy;                [ballDirectionArray setObject:[NSValue valueWithCGPoint:p] atIndexedSubscript:j];            }                        //设置移动方向            btn.centerX += vx;            btn.centerY += vy;                        //和其他2个按钮比较(碰撞检测)            for(int k = 0 ; k < 3; k++){                UIButton *otherbtn = ballArray[k];                                //和其他2个按钮比较                if (btn != otherbtn) {                    //注意方形和圆形                    float distance = sqrt(pow((btn.centerX - otherbtn.centerX), 2) + pow((btn.centerY - otherbtn.centerY), 2));                                        if(distance <= BALL_WIDTH){                        NSValue *valk = [ballDirectionArray objectAtIndex:k];                        CGPoint pk = [valk CGPointValue];                        if (isX == NO) {                            pk.y = -pk.y;                            //                            isX = !isX;                        }else{                            pk.x = -pk.x;                            //                            isX = !isX;                                                    }                                                [ballDirectionArray setObject:[NSValue valueWithCGPoint:pk] atIndexedSubscript:k];                                                                        NSValue *valk2 = [ballDirectionArray objectAtIndex:j];                        CGPoint pk2 = [valk2 CGPointValue];                        if (isX == YES) {                                                        pk2.x = -pk2.x;                        }else{                            pk2.y = -pk2.y;                        }                                                [ballDirectionArray setObject:[NSValue valueWithCGPoint:pk2] atIndexedSubscript:j];                                                isX = !isX;                                            }                }                            }                    }            } repeats:YES];            //    }];

代码工程：

点击打开链接http://download.csdn.net/detail/qq_15509071/9836118

0 0