UIPickerView控件简单使用

UIPickerView控件可以让用户去选择数据，和UITableView类似，UIPickerView也需要数据源

最后界面如下：

下一步，建立映射，在ViewController.h中

#import <UIKit/UIKit.h>

@interface MainViewController : UIViewController

<UIPickerViewDataSource,UIPickerViewDelegate>

//UIPickerView控件

@property (weak, nonatomic) IBOutlet UIPickerView *pickerViewValue;

- (IBAction)getValue:(id)sender;

//显示当前UIPickerView的值

@property (weak, nonatomic) IBOutlet UILabel *lalValue;

在ViewController.m中

@interface MainViewController ()

{

    NSArray *pickerArray;

}

@end

@implementation MainViewController

//初始化

- (void)viewDidLoad

{

    [super viewDidLoad];

    //设置数据源

    pickerArray = [NSArray arrayWithObjects:@"老虎",@"猴子",@"兔子",@"大象",@"猩猩", nil];

    //设置委托

    self.pickerViewValue.dataSource = self;

    self.pickerViewValue.delegate = self;

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

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

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

    return 1;

}

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

    return [pickerArray count];

}

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

    return [pickerArray objectAtIndex:row];

}

- (IBAction)getValue:(id)sender {

    NSInteger row = [self.pickerViewValue selectedRowInComponent:0];

    self.lalValue.text = [pickerArray objectAtIndex:row];

}

相信通过实践，大家都能做出来！

代码下载：http://download.csdn.net/detail/daichao622/7640559