如何使用双组件 UI 调用转换

Question

我将在下面发布我的代码作为快速说明，我在.h文件中定义了这两个组件，并且在选择某些行时需要调用操作。例如，如果组件 == 0 中的行和其他组件 == 1 这样做？仍然是iPhone编程的新手，提前感谢您!!

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 2;
}

  -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:    
 (NSInteger)component{
if (component==kapickerComponent) {
    return [parentarray count];
}
if (component == kbpickerComponent) {
    return [subarray count];
}
}

 -(NSString*) pickerView:(UIPickerView *)pickerView titleForRow: 
(NSInteger)rowforComponent:(NSInteger)component{
if (component == kapickerComponent) {
    return [self.parentarray objectAtIndex:row];
}
if (component == kbpickerComponent) {
    return [self.subarray objectAtIndex:row];
}
}
 - (BOOL)shouldAutorotateToInterfaceOrientation:
(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row 
inComponent:(NSInteger)component {

 if ( row. kapickerComponent ==0, and row.kbpickerComponent==1 ??????????? ){
    float number1 = ([initamount.text floatValue ]);
    initamount.text = [[NSString alloc]initWithFormat:@" ", number1];
    double answer = number1 *12;
    result.text = [[NSString alloc]initWithFormat:@" ", answer];
 }
} 

Answer 1

在这里：

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row 
       inComponent:(NSInteger)component {
    if ([thePickerView selectedRowInComponent:kapickerComponent] == 0 && [thePickerView selectedRowInComponent:kbpickerComponent] == 1) {
        float number1 = [initamount.text floatValue];
        initamount.text = [[NSString alloc]initWithFormat:@"%f", number1];
        double answer = number1 *12;
        result.text = [[NSString alloc] initWithFormat:@"%f", answer];
    }
}

Answer 2

if （ kapickerComponent.row == 0 && kbpickerComponent.row==1）{//你的代码在这里}