#import "ViewController.h"
@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>
/*** 数据数组 ***/
@property(nonatomic, strong) NSArray * foods;
@property (weak, nonatomic) IBOutlet UILabel *fruitLabel;
@property (weak, nonatomic) IBOutlet UILabel *mainFoodLabel;
@property (weak, nonatomic) IBOutlet UILabel *drinkLabel;
@end
@implementation ViewController
//懒加载
- (NSArray *) foods{
if(!_foods){
_foods = [NSArray arrayWithContentsOfFile:[ [NSBundle mainBundle] pathForResource:@"foods.plist" ofType:nil ] ];
}
return _foods;
}
- (void)viewDidLoad {
[super viewDidLoad];
//让label们显示当前的数据
self.fruitLabel.text = self.foods[0][0];
self.mainFoodLabel.text = self.foods[1][0];
self.drinkLabel.text = self.foods[2][0];
}
#pragma mark - <UIPickerViewDataSource, UIPikerViewDelegate>
//返回多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return self.foods.count;
}
//设置每一个component显示多少行
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
// NSLog(@"--- pickerView numberOfRowsInComponent");
NSArray * subArr = self.foods[component];
return subArr.count;
}
#pragma mark - <代理>
//component列row行显示什么文字
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
NSLog(@"--- pickerView titleForRow");
return self.foods[component][row];
}
//监听用户选中
- (void ) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
// NSLog(@"%zd的%zd", component, row);
//水果
if(component == 0 ){
self.fruitLabel.text = self.foods[component][row];
}else if( component == 1 ){
//主菜
self.mainFoodLabel.text =self.foods[component][row];
}else if( component == 2){
//饮料
self.drinkLabel.text = self.foods[component][row];
}
}
@end
知识点：
在XCode中 commond + option + 回车
参考资料：
http://www.cnblogs.com/songliquan/p/4564963.html
http://www.cnblogs.com/qingche/p/3565243.html
