//
//  YYViewController.m
//  06-簡單選菜系統的實現
//
//  Created by apple on 14-6-5.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYViewController.h"

//遵守數據源和代理協議
@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;
/**
 *  保存所有的數據
 */
@property(nonatomic,strong)NSArray *foods;
@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
- (IBAction)randomFood:(id)sender;

@end

@implementation YYViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    //在這里設置下方數據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，把數據信息加載進來
-(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];
   
    /*
     // 根據每一列的元素個數生成隨機值
     [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];
     */
   
    //設置一個隨機數
    for (int component=0; component<self.foods.count; component++) {
        //獲取當前列對應的數據元素的個數
        int total=[self.foods[component] count];
        //根據每一列的總數生成隨機數（當前生成的隨機數）
        int randomNumber=arc4random()%total;
       
        //獲取當前選中的行（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前生成的隨機數是否相同，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- 設置數據
//一共多少列
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return self.foods.count;
}

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

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

#pragma mark-設置下方的數據刷新
// 當選中了pickerView的某一行的時候調用
// 會將選中的列號和行號作為參數傳入
// 只有通過手指選中某一行的時候才會調用
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    //獲取對應列，對應行的數據
    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-隱藏狀態欄
-(BOOL)prefersStatusBarHidden
{
    return YES;
}
@end