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  • UIPickerView

    @protocol UIPickerViewDataSource<NSObject>
    @required
    
    // returns the number of 'columns' to displ   返回piker的列数
    - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
    
    // returns the # of rows in each component..   返回每列的行数
    - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
    @end
    
    
    @protocol UIPickerViewDelegate<NSObject>
    @optional
    
    // returns width of column and height of row for each component. 设置每列的宽
    - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;
    //设置每列的高
    - (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component; // these methods return either a plain UIString, or a view (e.g UILabel) to display the row for the component. // for the view versions, we cache any hidden and thus unused views and pass them back for reuse. // If you return back a different object, the old one will be released. the view will be centered in the row rect
    //设置每列的标题
    - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
    //设置自定义空件的宽和高
    - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view; //选择时触发该时间 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component; @end
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  • 原文地址:https://www.cnblogs.com/flyingdreaming/p/UIPickerView.html
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