ios中 pickerView的用法

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今天是一個特殊的日子（Mac pro 敲的 爽。。。 昨天到的）

////  QRViewController.m//#import "QRViewController.h"@interface QRViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>@property (weak, nonatomic) IBOutlet UILabel *fruitLable;//水果@property (weak, nonatomic) IBOutlet UILabel *mainLabel;//主菜@property (weak, nonatomic) IBOutlet UILabel *drinkLabel;//飲料@property (nonatomic,strong) NSArray *foods;@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;- (IBAction)ranDom;@end@implementation QRViewController- (void)viewDidLoad {    [super viewDidLoad];    for (int i=0; i<self.foods.count; i++) {        [self pickerView:nil didSelectRow:0 inComponent:i];    }    //[self pickerView:nil didSelectRow:0 inComponent:0];    //[self pickerView:nil didSelectRow:0 inComponent:1];    //[self pickerView:nil didSelectRow:0 inComponent:2];}/** *懶載入資料 */- (NSArray *)foods{    if(_foods==nil){        NSString *path=[[NSBundle mainBundle] pathForResource:@"foods" ofType:@"plist"];        NSArray *arraylist=[NSArray arrayWithContentsOfFile:path];        _foods=arraylist;    }    return _foods;}#pragma mark   -資料來源方法/** *一共多少列 */- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return self.foods.count;}/** * 某一列顯示多少行 */- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    NSArray *subfoods=self.foods[component];    return subfoods.count;}#pragma mark - 代理方法/** *某一列中的某一行顯示的資料 */- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{    return self.foods[component][row];}/** *選中某一行一列 */- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{    if(component==0){//水果        self.fruitLable.text=self.foods[component][row];    }else if(component==1){//主菜        self.mainLabel.text=self.foods[component][row];    }else if(component==2){//飲料        self.drinkLabel.text=self.foods[component][row];    }}/** *隨機產生一個 */- (IBAction)ranDom {    for (int i=0; i<self.foods.count; i++) {        //每一行的總長度        int count=[self.foods[i] count];        //產生一個隨機數        int row=arc4random()%count;        //設定pickerView選中的列的行        [self.pickerView selectRow:row inComponent:i animated:YES];        //設定Label的文字        [self pickerView:nil didSelectRow:row inComponent:i];    }    }@end

 

ios中 pickerView的用法