//
// ViewController.m
// pickView
//
// Created by Mac on 16/1/3.
// Copyright © 2016年 Mac. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>
@property (weak, nonatomic) IBOutlet UIPickerView *
pickView;
@property (nonatomic, strong)NSArray *
foods;
@property (weak, nonatomic) IBOutlet UILabel *
fruitLable;
@property (weak, nonatomic) IBOutlet UILabel *
mainfoodLable;
@property (weak, nonatomic) IBOutlet UILabel *
drinkLable;
-
(IBAction)randomPick;
@end
@implementation ViewController
- (NSArray *
)foods
{
if (!
_foods) {
NSString *path = [[NSBundle mainBundle] pathForResource:
@"foods.plist" ofType:nil];
NSArray *array =
[NSArray arrayWithContentsOfFile:path];
_foods =
array;
}
return _foods;
}
- (
void)viewDidLoad {
[super viewDidLoad];
[self pickerView:self.pickView didSelectRow:0 inComponent:
0];
[self pickerView:self.pickView didSelectRow:0 inComponent:
1];
[self pickerView:self.pickView didSelectRow:0 inComponent:
2];
}
#pragma mark - 数据源方法
//返回总共多少列；
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *
)pickerView
{
return self.foods.count;
}
//返回每列多收行；
- (NSInteger)pickerView:(UIPickerView *
)pickerView numberOfRowsInComponent:(NSInteger)component
{
NSArray *array =
self.foods[component];
return array.count;
}
#pragma mark - 代理方法
- (NSString *)pickerView:(UIPickerView *
)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
NSArray *array =
self.foods[component];
return array[row];
}
- (
void)pickerView:(UIPickerView *
)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
// NSLog(@"component is %d,row is %d",component,row);
NSArray *array =
self.foods[component];
NSString *str =
array[row];
switch (component) {
case 0:
self.fruitLable.text =
str;
break;
case 1:
self.mainfoodLable.text =
str;
break;
case 2:
self.drinkLable.text =
str;
break;
default:
break;
}
}
#pragma mark - 随机点菜按钮
-
(IBAction)randomPick {
// 找出总共多少列
NSInteger countOfColumns =
self.foods.count;
// 利用for循环找出每一列有多少行
for (
int i =
0; i < countOfColumns ; i ++
) {
NSArray *array =
self.foods[i];
// 找出当前这一列有多少行；
NSInteger countOfRows =
array.count;
// 在这一列中随机产生一个数字；
NSUInteger randomRow = arc4random_uniform((
int)countOfRows);
// 更改数据
[self pickerView:self.pickView didSelectRow:randomRow inComponent:i];
[self.pickView selectRow:randomRow inComponent:i animated:YES];
}
}
@end
转载于:https://www.cnblogs.com/BJTUzhengli/p/5097279.html
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