UIPickView的基本使用

最新推荐文章于 2020-09-16 16:32:21 发布

superyuan567

最新推荐文章于 2020-09-16 16:32:21 发布

阅读量357

点赞数

分类专栏： ios开发

本文链接：https://blog.youkuaiyun.com/superyuan567/article/details/104250912

版权

ios开发专栏收录该内容

30 篇文章

订阅专栏

本文详细介绍如何使用UIPickerView，包括设置数据源、代理，以及如何响应用户选择。通过实例展示了如何配置多列、多行，并返回每行的显示内容。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

UIPickView的基本使用

//UIPickView和TableView一样,想要展示数据也要设置数据源和代理
//设置数据源
self.pickView.dataSource = self;
//设置代理
self.pickView.delegate = self;


//遵守数据源,代理协议:
@interface ViewController ()
<UIPickerViewDataSource,UIPickerViewDelegate>
@property (weak, nonatomic) IBOutlet UIPickerView *pickView;
@end


//实现数据源代理方法:
//总共有多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView{

　　return 3;
}


//第component列有多少行.
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

　　return 4;
}


//返回每一列的宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{

}


//返回每一行的高度
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{

　　return 50;
}


//每一行展示什么内容
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

　　return @"gaowei";
}


//返回每一行的视图UIView
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{

　　UIButton *btn = [UIButton
　　buttonWithType:UIButtonTypeContactAdd];
　　return btn;
}


//当前选中的是哪一列的哪一行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)rowinComponent:(NSInteger)component{
    
}

demo

//ViewController.h
@interface ViewController: UIViewController
@end

//ViewController.m
@interface ViewController()<UIPickViewDataSource, UIPickViewDeleate>
@property (nonatomic, weak) IBOutlet UILabel *showLabel;
@property (nonatomic,weak) IBOutlet UIPickView *pickView;
@property (nonatomic,strong) NSArray *array;
@end
@implementation ViewController
-(void)viewDidLoad{
   [super viewDidLoad];
   self.pickView.dataSource = self;
   self.pickView.delegate = self;
   
}
-(void)array{
   if(_array == nil){
      NSString *path = [[NSBundle mainBundle] pathForResource:@"foods.plist" ofType:nil];
       _array = [NSArray arrayWithContentsOfFile:path];    
   }
    return _array;
}

//实现数据源代理方法:
//总共有多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView{

　　return self.array.count;
}


//第component列有多少行.
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
       return self.array[component].count;
}


//返回每一列的宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{

}


//返回每一行的高度
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component{

　　return 50;
}


//每一行展示什么内容
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

　　return self.array[component][row];
}


//返回每一行的视图UIView
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{

　　UIButton *btn = [UIButton
　　buttonWithType:UIButtonTypeContactAdd];
　　return btn;
}


//当前选中的是哪一列的哪一行
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    self.showLabel.text = self.array[component][row];
}

@end