UIPickView和UIDatePicker

UIPickView和UIDatePicker

UIPickView

样式

Paste_Image.png

作用

- 通常用在注册，比如选择城市
- 老虎机效果

常见用法

- 独立，没有任何关系 -》菜单系统
- 相关联的，下一列和第一列有联系 -》城市选择
- 图文并帽 -》国旗

注意

- 如何得到选中的某一行 `[self.pickerView selectRow:row inComponent:componen animated:YES];`
- 调用pickView滚动不会触发代理，只有用户手动滚动才能触发

显示数据

- 实现数据源和代理方法
    - UIPickView数据源方法

#pragma mark <UIPickerViewDataSource>
/**
 *  返回多少列
 */
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
/**
 *  返回第component列有多少行
 */
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
- 

    - UIPickView代理方法

#pragma mark <UIPickerViewDelegate>


/* *  返回第component列第row行的展示样式*/
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
/* *  返回第component列第row行带属性的标题*/
- (NSAttributedString *)pickerView:(UIPickerView *)pickerView attributedTitleForRow:(NSInteger)row forComponent:(NSInteger)component ;
/* *  返回第component列第row行展示视图*/
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view;
/* *  选中第component列第row行调用*/
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component;

/* *  返回第component列每一行的宽度*/
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;
/* *  返回第component列每一行的高度*/
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component;

UIDatePicker

样式

Paste_Image.png