运用button写的一个关灯游戏    
    声明了一个属性NSMutableArray *arr;     _arr = [[NSMutableArray alloc] init];     创建10行8列的button矩阵    for (int i =0; i < 10; i++) {        for (int j =0; j < 8; j++) {             UIButton *button = [UIButtonbuttonWithType:UIButtonTypeSystem];             button.frame =CGRectMake(27.5 + j *40, 20 + i *40, 35, 35);     给button添加背景图片             [button setBackgroundImage:[UIImageimageNamed:@"12"]forState:UIControlStateNormal];     将button添加至数组             [_arraddObject:button];             [self.viewaddSubview:button];     给button一个点击事件             [button addTarget:selfaction:@selector(buttonDidPress:)forControlEvents:UIControlEventTouchUpInside];         }     }     做了一个重新开始的button按钮
    PS:后面的水印是失误，请忽略 - -     UIButton *button1 = [UIButtonbuttonWithType:UIButtonTypeSystem];     button1.frame =CGRectMake(0,500, self.view.frame.size.width,50);     button1.backgroundColor = [UIColorcyanColor];     [button1 setTitle:@"重新开始"forState:UIControlStateNormal];     [button1 addTarget:selfaction:@selector(buttonNewGame:)forControlEvents:UIControlEventTouchUpInside];     [self.viewaddSubview:button1];
重新开始的点击事件 -(void)buttonNewGame:(UIButton *)sender {    for (UIButton *buttonin _arr) {         [button setBackgroundImage:[UIImageimageNamed:@"12"]forState:UIControlStateNormal];     } }
判断改变背景图片的点击事件 -(void)buttonDidPress:(UIButton *)sender { 这里的打印是找bug时用的 //    NSLog(@"A");    遍历数组里的所有button    for (UIButton *buttonin _arr) { 判断条件，找出与sender相邻的button        if (fabs(button.frame.origin.x - sender.frame.origin.x) + fabs(button.frame.origin.y - sender.frame.origin.y) == 40) { //            NSLog(@"B");     改变上面找出的button背景图片             if ([[button backgroundImageForState:UIControlStateNormal]isEqual:[UIImageimageNamed:@"12"]]) { //                NSLog(@"C");                 [button setBackgroundImage:[UIImageimageNamed:@"23"]forState:UIControlStateNormal];             }else {                 [button setBackgroundImage:[UIImageimageNamed:@"12"]forState:UIControlStateNormal];             }         }     }     改变sender背景图片     if ([[senderbackgroundImageForState:UIControlStateNormal]isEqual:[UIImageimageNamed:@"23"]]) {         [(UIButton *)sendersetBackgroundImage:[UIImageimageNamed:@"12"]forState:UIControlStateNormal];     }else {         [(UIButton *)sendersetBackgroundImage:[UIImageimageNamed:@"23"]forState:UIControlStateNormal];     }
}