详解iOS开发中UIPickerView控件的使用方法

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#import "ViewController.h"
#define kFirstComponent 0
#define kSubComponent 1
5、判断是那个齿轮，返回相应的数据的Count。
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-(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    if(component == kFirstComponent){
        return [pickerArray count];
    }else {
        return [subPickerArray count];
    }

 

}

6、根据component返回相应的String数据
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    -(NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if(component == kFirstComponent){
        return [pickerArray objectAtIndex:row];
    }else {
        return [subPickerArray objectAtIndex:row];
    }
}
7、拖动左边的齿轮时，右边的数据相应的Reload更新。
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-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    if (component == kFirstComponent) {
        subPickerArray = [dicPicker objectForKey:[pickerArray objectAtIndex:row]]; 
        [pickerView selectRow:0 inComponent:kSubComponent animated:YES];
        [pickerView reloadComponent:kSubComponent];
    }
}
8、相应选择的数据，并显示在TextField上。
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-(void)textFieldDidEndEditing:(UITextField *)textField{
    NSInteger firstViewRow = [selectPicker selectedRowInComponent:kFirstComponent];
    NSInteger subViewRow = [selectPicker selectedRowInComponent:kSubComponent];
    NSString * firstString = [pickerArray objectAtIndex:firstViewRow];
    NSString * subString =  [[dicPicker objectForKey:[pickerArray objectAtIndex:firstViewRow]] objectAtIndex:subViewRow] ;
    NSString *textString = [[NSString alloc ] initWithFormat:@"您选择了：%@%@%@", firstString, @" 里的 ", subString];
    self.textField.text = textString;
}

 

- (IBAction)selectButton:(id)sender {
    [textField endEditing:YES];