摘要：
@protocol UIPickerViewDataSource@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 阅读全文
