#pragma mark -大图小图切换
- (IBAction)bigImage
{
    // 如果没有放大，就放大，否则就缩小
    // 通过蒙板的alpha来判断按钮是否已经被放大
    if (self.cover.alpha== 0.0) { // 放大
        // 2. 将图像按钮弄到最前面
        // bringSubviewToFront将子视图前置
        [self.viewbringSubviewToFront:self.iconButton];
       
        // 3. 动画放大图像按钮
        CGFloat w =self.view.bounds.size.width;
        CGFloat h = w;
        CGFloat y = (self.view.bounds.size.height- h) * 0.5;
       
        [UIViewanimateWithDuration:1.0fanimations:^{
            self.iconButton.frame= CGRectMake(0, y, w, h);
            self.cover.alpha= 1.0;
        }];
    } else { // 缩小
        [UIViewanimateWithDuration:1.0animations:^{
            // 将图像恢复初始位置
            self.iconButton.frame= CGRectMake(85,85,150,150);
            self.cover.alpha= 0.0;
        }];
    }
}

- (UIButton*)cover
{
    if (_cover== nil) {
        _cover = [[UIButtonalloc]initWithFrame:self.view.bounds];
        _cover.backgroundColor= [UIColorcolorWithWhite:0.0alpha:0.5];
        [self.viewaddSubview:_cover];
        _cover.alpha= 0.0;
       
        [_coveraddTarget:selfaction:@selector(bigImage)forControlEvents:UIControlEventTouchUpInside];
    }
    return _cover;
}

#pragma mark -下一题
- (IBAction)nextQuestion
{
    // 1. 当前答题的索引，索引递增
    self.index++;
    // 如果index已经到最后一题，提示用户，播放动画，音乐.....
    if (self.index== self.questions.count) {
        NSLog(@"通关了");
        return;
    }
    // 2. 从数组中按照索引取出题目模型数据
    HMQuestion *question =self.questions[self.index];
    // 3. 设置基本信息
    [selfsetupBasicInfo:question];
    // 4. 设置答案按钮
    [selfcreateAnswerButtons:question];
    // 5. 设置备选按钮
    [selfcreateOptionButtons:question];
}

/**设置基本信息*/
- (void)setupBasicInfo:(HMQuestion*)question
{
    self.noLabel.text= [NSStringstringWithFormat:@"%d/%d",self.index+ 1, self.questions.count];
    self.titleLabel.text= question.title;
    [self.iconButtonsetImage:question.imageforState:UIControlStateNormal];
    // 如果到达最后一题，禁用下一题按钮
    self.nextQuestionButton.enabled= (self.index< self.questions.count- 1);
}

/**创建答案区按钮*/
- (void)createAnswerButtons:(HMQuestion*)question
{
    // 首先清除掉答题区内的所有按钮
    // 所有的控件都继承自UIView，多态的应用
    for (UIView*btn in self.answerView.subviews) {
        [btn removeFromSuperview];
    }
    CGFloat answerW =self.answerView.bounds.size.width;
    int length = question.answer.length;
    CGFloat answerX = (answerW -kButtonWidth* length - kButtonMargin * (length -1)) *0.5;
   
    // 创建所有答案的按钮
    for (inti = 0; i < length; i++) {
        CGFloat x = answerX + i * (kButtonMargin+ kButtonWidth);
       
        UIButton *btn = [[UIButtonalloc]initWithFrame:CGRectMake(x,0,kButtonWidth,kButtonHeight)];
        [btn setBackgroundImage:[UIImageimageNamed:@"btn_answer"]forState:UIControlStateNormal];
        [btn setBackgroundImage:[UIImageimageNamed:@"btn_answer_highlighted"]forState:UIControlStateHighlighted];
       
        // 设置标题颜色
        [btn setTitleColor:[UIColorblackColor]forState:UIControlStateNormal];
       
        [self.answerViewaddSubview:btn];
        [btn addTarget:selfaction:@selector(answerClick:)forControlEvents:UIControlEventTouchUpInside];
    }
}

/**创建备选区按钮*/
- (void)createOptionButtons:(HMQuestion*)question
{
    // 问题：每次调用下一题方法时，都会重新创建21个按钮
    // 解决：如果按钮已经存在，并且是21个，只需要更改按钮标题即可
    if (self.optionsView.subviews.count!= question.options.count) {
        // 重新创建所有按钮
        for (UIView*view in self.optionsView.subviews) {
            [view removeFromSuperview];
        }
       
        CGFloat optionW =self.optionsView.bounds.size.width;
        CGFloat optionX = (optionW -kTotolCol* kButtonWidth - (kTotolCol- 1) * kButtonMargin) *0.5;
       
        for (inti = 0; i < question.options.count; i++) {
            int row = i /kTotolCol;
            int col = i %kTotolCol;
           
            CGFloat x = optionX + col * (kButtonMargin+ kButtonWidth);
            CGFloat y = row * (kButtonMargin+ kButtonHeight);
           
            UIButton *btn = [[UIButtonalloc]initWithFrame:CGRectMake(x, y, kButtonWidth,kButtonHeight)];
            [btn setBackgroundImage:[UIImageimageNamed:@"btn_option"]forState:UIControlStateNormal];
            [btn setBackgroundImage:[UIImageimageNamed:@"btn_option_highlighted"]forState:UIControlStateHighlighted];
           
            [btn setTitleColor:[UIColorblackColor]forState:UIControlStateNormal];
           
            [self.optionsViewaddSubview:btn];
           
            // 添加按钮监听方法
            [btn addTarget:selfaction:@selector(optionClick:)forControlEvents:UIControlEventTouchUpInside];
        }
        NSLog(@"创建候选按钮");
    }
   
    // 如果按钮已经存在，在点击下一题的时候，只需要设置标题即可
    int i = 0;
    for (UIButton*btn in self.optionsView.subviews) {
        // 设置备选答案
        [btn setTitle:question.options[i++]forState:UIControlStateNormal];
       
        // 回复所有按钮的隐藏状态
        btn.hidden= NO;
    }
}

#pragma mark -候选按钮点击方法
- (void)optionClick:(UIButton*)button
{
    // 1. 在答案区找到第一个文字为空的按钮
    UIButton *btn = [selffirstAnswerButton];
   
    // 如果没有找到按钮=>所有的"答题按钮都有字"，直接返回
    if (btn ==nil) {
        // 都有字判断胜负
    } else {
        // 2. 将button的标题设置给答案区的按钮
        [btn setTitle:button.currentTitleforState:UIControlStateNormal];
       
        // 3. 将button隐藏
        button.hidden= YES;
    }
    // 4. 判断结果
    [selfjudge];
}

4>判断胜负
* 胜利：进入下一题
* 失败：提示用户重新选择

- (void)judge
{
    // 如果四个按钮都有文字，才需要判断结果
    // 遍历所有答题区的按钮
    BOOL isFull =YES;
    NSMutableString *strM = [NSMutableStringstring];
   
    for (UIButton*btn in self.answerView.subviews) {
        if (btn.currentTitle.length== 0) {
            // 只要有一个按钮没有字
            isFull = NO;
            break;
        } else {
            // 有字，拼接临时字符串
            [strM appendString:btn.currentTitle];
        }
    }
    if (isFull) {
        NSLog(@"都有字");
        // 判断是否和答案一致
        // 根据self.index获得当前的question
        HMQuestion *question =self.questions[self.index];
       
        // 如果一致，进入下一题
        if ([strMisEqualToString:question.answer]) {
            NSLog(@"答对了");
            [selfsetAnswerButtonsColor:[UIColorblueColor]];
           
            // 增加分数
            [selfchangeScore:800];
           
            // 等待0.5秒，进入下一题
            [selfperformSelector:@selector(nextQuestion)withObject:nilafterDelay:0.5];
        } else {
            // 如果不一致，修改按钮文字颜色，提示用户
            NSLog(@"答错了");
            [selfsetAnswerButtonsColor:[UIColorredColor]];
        }
    }
}

/**修改答题区按钮的颜色*/
- (void)setAnswerButtonsColor:(UIColor*)color
{
    for (UIButton*btn in self.answerView.subviews) {
        [btn setTitleColor:colorforState:UIControlStateNormal];
    }
}

//在答案区找到第一个文字为空的按钮
- (UIButton*)firstAnswerButton
{
    // 取按钮的标题
    // 遍历答题区所有按钮
    for (UIButton*btn in self.answerView.subviews) {
        if (btn.currentTitle.length== 0) {
            return btn;
        }
    }
    return nil;
}

#pragma mark -答题区按钮点击方法
- (void)answerClick:(UIButton*)button
{
    // 1. 如果按钮没有字，直接返回
    if (button.currentTitle.length== 0) return;
   
    // 2. 如果有字，清除文字，候选区按钮显示
    // 1> 使用button的title去查找候选区中对应的按钮
    UIButton *btn = [selfoptionButtonWithTilte:button.currentTitleisHidden:YES];
   
    // 2> 显示对应按钮
    btn.hidden= NO;
   
    // 3> 清除button的文字
    [button setTitle:@""forState:UIControlStateNormal];
   
    // 4> 只要点击了按钮上的文字，意味着答题区的内容不完整
    [selfsetAnswerButtonsColor:[UIColorblackColor]];
}

- (UIButton*)optionButtonWithTilte:(NSString*)title isHidden:(BOOL)isHidden
{
    // 遍历候选区中的所有按钮
    for (UIButton*btn in self.optionsView.subviews) {
        if ([btn.currentTitleisEqualToString:title] && btn.isHidden== isHidden) {
            return btn;
        }
    }
    return nil;
}
 
6>提示功能

#pragma mark -提示功能
- (IBAction)tipClick
{
    // 1. 把答题区中所有的按钮清空
    for (UIButton*btn in self.answerView.subviews) {
        // 用代码执行点击答题按钮的操作
        [selfanswerClick:btn];
    }
   
    // 2. 把正确答案的第一个字，设置到答题区中
    // 1> 知道答案的第一个字
    HMQuestion *question =self.questions[self.index];
    // 月光宝盒
    NSString *first = [question.answersubstringToIndex:1];
    // 取出文字对应的候选按钮
    UIButton *btn = [selfoptionButtonWithTilte:firstisHidden:NO];
    [selfoptionClick:btn]; 
    // 扣分
    [selfchangeScore:-1000];
}

#pragma mark -分数处理
- (void)changeScore:(int)score
{
    // 取出当前的分数
    int currentScore =self.scoreButton.currentTitle.intValue;
   
    // 使用score调整分数
    currentScore += score;
   
    // 重新设置分数
    [self.scoreButtonsetTitle:[NSStringstringWithFormat:@"%d", currentScore] forState:UIControlStateNormal];
}

8> 收尾工作：图标和启动图片