iOS UIPickerView的常见属性和方法

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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;