1.在.h头文件里面添加以下代码:
#import <UIKit/UIKit.h> @interface PickerView : UIViewController { IBOutlet UIPickerView * mypickerView;//连接的时候记得连上delegate IBOutlet UILabel * mylabel; NSArray *pickerViewData;//pickerView的数据 } @property(nonatomic,retain) UIPickerView * mypickerView; @property(nonatomic,retain) UILabel * mylabel; @property(nonatomic,retain) NSArray *pickerViewData;//注意加上这句 -(IBAction) showSelectmessage;//按钮点击事件 @end
2.在xib文件里面添加一个pickerView,一个button,一个label,如下图所示,要实现的功能是在pickerView里面滚动选择某一项,然后点击“点我显示选择的信息”按钮将pickerView中选中的内容显示在最下面的label中:
3.连接各项,将view中的Picker View与mypickerView连接,将“点我显示选择的信息”button的Touch Up Inside事件与showSelectmessage方法相连,将view中label与mylabel相连,将view中Picker View的dataSource和delegate连接到File‘s Owner,如下图所示:
4.在viewDidLoad方法中添加如下代码,初始化pickerView的数据:
- (void)viewDidLoad { NSArray *array=[[NSArray alloc] initWithObjects:@"哈哈", @"two", @"three", @"four", @"five", nil]; self.pickerViewData = array;//注意一定要写self,否则不对 [array release]; [super viewDidLoad];
5.添加界面上按钮的点击事件方法,该方法将pickerView中选中的内容显示在label中:
-(IBAction) showSelectmessage{ NSInteger row = [mypickerView selectedRowInComponent:0]; NSString * mys = [pickerViewData objectAtIndex:row]; mylabel.text = mys; }
6.实现如下方法,设置Picker View视图中的组件(列)数量:
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return 1; }
7.实现如下方法,设置Picker View视图中显示的项(行)数:
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { return [pickerViewData count]; }
8.实现如下方法,将pickerviewData数据填充到Picker View中:
-(UIView *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { return [pickerViewData objectAtIndex:row]; }