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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 dataSource;
//代理(用来告诉UIPickerView每1列的每1行显示什么内容,监听UIPickerView的选择)
@property(nonatomic,assign)id delegate;
//是否要显示选中的指示器
@property(nonatomic)BOOLshowsSelectionIndicator;
//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;
//获得第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;
