UIPickerView 实现多列选择栏

首先要实现以下两个代理：UIPickerViewDelegate、UIPickerViewDatasource
UIPickerViewDelegate中的方法：
– pickerView:rowHeightForComponent:

– pickerView:widthForComponent:

– pickerView:titleForRow:forComponent:

– pickerView:viewForRow:forComponent:reusingView:

– pickerView:didSelectRow:inComponent:

UIPickerViewDatasource中的方法：
– numberOfComponentsInPickerView:

– pickerView:numberOfRowsInComponent:

下面是一些儿实例中的代码
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

return 2;

}
//用于设置pickerView多少列选择栏

- (NSInteger)pickerView:(UIPickerView *)pickerView

numberOfRowsInComponent:(NSInteger)component{

if (component == PickerOne) {

return [array1 count];

}

return [array2 count];

}
//设置每一列有多少个行数

- (NSString *)pickerView:(UIPickerView *)pickerView

titleForRow:(NSInteger)row

forComponent:(NSInteger)component{

if (component == PickerOne) {

return [self.array1 objectAtIndex:row];

}

NSArray * array=[self.dictionary2 allValues];

array=[array sortedArrayUsingSelector:@selector(compare:)];

return [self.dictionary2 valueForKey:[array2 objectAtIndex:row]];

}
//设置每列数据

- (CGFloat)pickerView:(UIPickerView *)pickerView

widthForComponent:(NSInteger)component{

if (component==0) {

return 120;

}

return 200;

}
//设置每列的宽度

- (void)pickerView:(UIPickerView *)pickerView

didSelectRow:(NSInteger)row

inComponent:(NSInteger)component{

if (component==0) {

self.UMengFeedbackGender=row;

}

if (component==1) {

self.UMengFeedbackAge=row;

}

[self showButtonText:[self.dictionary1 valueForKey:[NSString

stringWithFormat:@"%d",

self.UMengFeedbackGender]]

stringAge:[self.dictionary2 valueForKey:[NSString

stringWithFormat:@"%d",

self.UMengFeedbackAge]]];

}
//设置选中一行后触发的事件