UIPickerView选择控件实现选择轮播效果（转轮效果）

来源：互联网发布：安卓系统数据网络开关编辑：程序博客网时间：2024/04/29 08:19

UIPickerView为用户提供了选择器功能，使用户以更好的体验方式实现数据的选择，如图：

UIPickerView控件的使用方法：（创建好根视图：MainViewController）

#import <UIKit/UIKit.h>@interface MainViewController : UIViewController<UIPickerViewDelegate>{    UIPickerView *pickerView;    UILabel *contentview;    NSArray *content;  // 星座;}@end

实现部分：

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view.}-(void)loadView{    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];    self.view = view;    view.backgroundColor = [UIColor yellowColor];    [view release];    // 初始化数据， 这些数据将显示在picker中    content = [[NSArray alloc] initWithObjects:@"水瓶座", @"双鱼座", @"白羊座        ", @"金牛座", @"双子座", @"巨蟹座", @"狮子座", @"处女座", @"天秤座", @"天蝎座", @"射手座", @"白羊座",nil];    // 设置选择器    pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 150, 320, 216)];    // 设置代理    pickerView.delegate = self;    pickerView.showsSelectionIndicator = YES;    [self.view addSubview:pickerView];    contentview = [[UILabel alloc] initWithFrame:CGRectMake(80, 80, 100, 40)];    contentview.backgroundColor = [UIColor clearColor];    [self.view addSubview:contentview];}#pragma mark--处理方法// 返回显示的数列- (NSInteger)numberOfRowsInComponent:(NSInteger)component{    return 1;}// 返回当前列显示的行数- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    return [content count];}// 设置当前的内容，如果行没有显示则自动释放- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{    return [content objectAtIndex:row];}- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{//    NSString *result = [pickerView pickView:pickerView titleForRow:row forComponent:component];        NSString *result = nil;    result = [content objectAtIndex:row];    NSLog(@"result:%@", result);    contentview.text = result;    [result release];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}

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