#import "YYViewController.h"

//遵守數(shù)據(jù)源和代理協(xié)議
@interface YYViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>
/**
 *  水果
 */
@property (strong, nonatomic) IBOutlet UILabel *fruitLab;
/**
 *  主菜
 */
@property (strong, nonatomic) IBOutlet UILabel *stapleLab;
/**
 *  飲料
 */
@property (strong, nonatomic) IBOutlet UILabel *drinkLab;
/**
 *  保存所有的數(shù)據(jù)
 */
@property(nonatomic,strong)NSArray *foods;
@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
- (IBAction)randomFood:(id)sender;

@end

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    //在這里設(shè)置下方數(shù)據(jù)刷新部分的初始顯示
    for (int component = 0; component<self.foods.count; component++) {
        [self pickerView:nil didSelectRow:0 inComponent:component];
    }
}

#pragma mark-使用懶加載，把數(shù)據(jù)信息加載進(jìn)來
-(NSArray *)foods
{
    if (_foods==nil) {
        NSString *fullpath=[[NSBundle mainBundle]pathForResource:@"foods.plist" ofType:nil];
        NSArray *arrayM=[NSArray arrayWithContentsOfFile:fullpath];
        _foods=arrayM;
    }
    return _foods;
}

#pragma mark-處理隨機按鈕的點擊事件
- (IBAction)randomFood:(id)sender {
   
    // 讓pickerView主動選中某一行
    // 讓pickerView選中inComponent列的Row行
    //    [self.pickerView selectRow:1 inComponent:0 animated:YES];
   
    /*
     [self.pickerView selectRow: arc4random() % 12 inComponent:0 animated:YES];
     [self.pickerView selectRow: arc4random() % 15 inComponent:1 animated:YES];
     [self.pickerView selectRow: arc4random() % 10 inComponent:2 animated:YES];
     */
   
    //    [self.foods objectAtIndex:0]; == self.foods[0];
    //    [self.foods[0] count];
   
    /*
     // 根據(jù)每一列的元素個數(shù)生成隨機值
     [self.pickerView selectRow: arc4random() % [self.foods[0] count] inComponent:0 animated:YES];
     [self.pickerView selectRow: arc4random() % [self.foods[1] count] inComponent:1 animated:YES];
     [self.pickerView selectRow: arc4random() % [self.foods[2] count] inComponent:2 animated:YES];
     */
   
    //設(shè)置一個隨機數(shù)
    for (int component=0; component<self.foods.count; component++) {
        //獲取當(dāng)前列對應(yīng)的數(shù)據(jù)元素的個數(shù)
        int total=[self.foods[component] count];
        //根據(jù)每一列的總數(shù)生成隨機數(shù)（當(dāng)前生成的隨機數(shù)）
        int randomNumber=arc4random()%total;
       
        //獲取當(dāng)前選中的行（上一次隨機后移動到的行）
        int oldRow=[self.pickerView selectedRowInComponent:0];
       
        //比較上一次的行號和當(dāng)前生成的隨機數(shù)是否相同，如果相同的話則重新生成
        while (oldRow==randomNumber) {
                randomNumber=arc4random()%total;
        }
       
        //讓pickerview滾動到指定的某一行
        [self.pickerView selectRow:randomNumber inComponent:component animated:YES];
        //模擬，通過代碼選中某一行
        [self pickerView:nil didSelectRow:randomNumber inComponent:component];
    }
}

#pragma mark- 設(shè)置數(shù)據(jù)
//一共多少列
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return self.foods.count;
}

//每列對應(yīng)多少行
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    //1.獲取當(dāng)前的列
    NSArray *arayM= self.foods[component];
    //2.返回當(dāng)前列對應(yīng)的行數(shù)
    return arayM.count;
}

//每列每行對應(yīng)顯示的數(shù)據(jù)是什么
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    //1.獲取當(dāng)前的列
    NSArray *arayM= self.foods[component];
    //2.獲取當(dāng)前列對應(yīng)的行的數(shù)據(jù)
    NSString *name=arayM[row];
    return name;
}

#pragma mark-設(shè)置下方的數(shù)據(jù)刷新
// 當(dāng)選中了pickerView的某一行的時候調(diào)用
// 會將選中的列號和行號作為參數(shù)傳入
// 只有通過手指選中某一行的時候才會調(diào)用
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    //獲取對應(yīng)列，對應(yīng)行的數(shù)據(jù)
    NSString *name=self.foods[component][row];
    //賦值
    if (0==component) {
        self.fruitLab.text=name;
    }else if(1==component)
    {
        self.stapleLab.text=name;
    }else
        self.drinkLab.text=name;
}

#pragma mark-隱藏狀態(tài)欄
-(BOOL)prefersStatusBarHidden
{
    return YES;
}
@end