[ iOS ] PickerView 簡易教學

1.建立專案（請參考HelloWorld教學），放置PickerView及Label。

2.建立屬性及參考接口（Referencing Outlet），在Referencing Outlet中New Referencing Outlet接口按下mouse拖移至DLIViewController.h，會新增下列程式如下；

@property (strong, nonatomic) IBOutlet UILabel *result;

3.對pickerView重覆步驟2，另外也在Outlets中將datasource及delegate兩個接口拖移至File's Owner。

4.輸入程式

5.DLIControllerView.h程式如下；

#import

@interface DLIViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>{

    NSArray *array;

}

@property (strong, nonatomic) IBOutlet UIPickerView *picker;

@property (strong, nonatomic) IBOutlet UILabel *result;

@end

6.DLIControllerView.m程式如下；

#import "DLIViewController.h"

@interface DLIViewController ()

@end

@implementation DLIViewController

@synthesize picker;

@synthesize result;

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

    array = [[NSArray alloc] initWithObjects:@"1",@"2",@"3", nil];

}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

    result.text = [array objectAtIndex:row];

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

    return 1;

}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

    return [array objectAtIndex:row];

}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

    return 3;

}

@end

6.執行結果