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.youkuaiyun.com/detail/daichao622/7640559