pickView的菜单选择代码

//
//  ViewController.m
//  044-PickerViewTest
//

//  Copyright (c) 2015年 juanjuan. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *fruitLabel;
@property (weak, nonatomic) IBOutlet UILabel *mainLabel;
@property (weak, nonatomic) IBOutlet UILabel *drinkLabel;
@property (weak, nonatomic) IBOutlet UIButton *randomButton;

- (IBAction)randomClicked;

@property (weak, nonatomic) IBOutlet UIPickerView *pickView;

@property (nonatomic, strong) NSArray *foods;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   // self.fruitLabel.text = self.foods[0][0];
   // self.mainLabel.text = self.foods[1][0];
   // self.drinkLabel.text = self.foods[2][0];
    
    for (int i = 0; i

//对应每个label的显示
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if (component == 0) {
        self.fruitLabel.text = self.foods[component][row];
    }else if(component == 1){
        self.mainLabel.text = self.foods[component][row];
    }else if(component == 2){
        self.drinkLabel.text = self.foods[component][row];
    }
}
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    
    return self.foods.count;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    
    NSArray *subfoods =  self.foods[component];

     return subfoods.count;
}
- (IBAction)randomClicked {
    for (int component = 0; component < self.foods.count; component++) {
        //第component列数组的总长度
        int count  = [self.foods[component] count];
        int oldRow = [self.pickView selectedRowInComponent:component];
        int randowRow = arc4random()%count;
        while(randowRow == oldRow)
        {
            randowRow = arc4random()%count;
        }
        //让pickview主动选择第component列的第randowRow列
        [self.pickView selectRow:randowRow inComponent:component animated:YES];
        
        //设置label的文字
        [self pickerView:nil didSelectRow:randowRow inComponent:component];
        
        
    }
}
                      
                      
                      
                      
                      
                      
                      
                      
@end