IOS的UIPickerView 和UIDatePicker

1.UIPickerView的常见属性

//数据源(用来告诉UIPickerView有多少列多少行)
@property(nonatomic,assign) id<UIPikerViewDataSource> dataSource;
//代理(用来告诉UIPickerView每一列的每一行显示什么内容,监听UIPickerView的选择)
@property(nonatomic,assign) id<UIPickerViewDelegate> delegate;
//是否要显示选中的指示器
@property(nonatomic) BOOL  showsSelectionIndicator;
//一共有多少列
@property(nonatomic,readonly) NSInteger numberOfComponents;

2.UIPickerView的常见方法

//重新刷新所有列
-(void)reloadAllComponents;
//重新刷新第component列
-(void)reloadComponent:(NSInteger)component;
//主动选中第component列的第row行
-(void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL) animated;
//获取第component列的当前选中的行号
-(NSInteger)selectedRowIncomponent:(NSInteger) component;

3.数据源方法(UIPickerViewDataSource)

//  一共有多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
//  第component列一共有多少行
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;

4.代理方法(UIPickerViewDelegate)

//  第component列的宽度是多少
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;
//  第component列的行高是多少
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component;

//  第component列第row行显示什么文字
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;

//  第component列第row行显示怎样的view(内容)
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view;

//  选中了pickerView的第component列第row行
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component;

UIDatePicker

1.常见属性

// datePicker的显示模式
@property (nonatomic) UIDatePickerMode datePickerMode;
// 显示的区域语言
@property (nonatomic, retain) NSLocale   *locale;

2.监听UIDatePicker的选择

因为UIDatePicker继承自UIControl,所以通过addTarget:..监听