基于另一个UIPickerView的UIPickerView显示

Question

我有两个不同的UIPickerView，用户选择第一个UIPickerView，从第一个选择器的didSelectRow中获得第二个UIPickerView的输入。我试着为个别的采摘者设置标签，结果什么都没有。我的代码如下。

//Picker-1
pickerView1 = [[UIpickerView alloc] init];
pickerView1 setDataSource: self];
[pickerView1 setDelegate: self];
[pickerView1 setFrame: CGRectMake(85,360,99,162)];
pickerView1.showsSelectionIndicator = YES;
[pickerView1 selectRow:2 inComponent:0 animated:YES];

//Picker-2
pickerView2 = [[UIpickerView alloc] init];
pickerView2 setDataSource: self];
[pickerView2 setDelegate: self];
[pickerView2 setFrame: CGRectMake(191,360,99,162)];
pickerView2.showsSelectionIndicator = YES;
[pickerView2 selectRow:2 inComponent:0 animated:YES];

//Picker -1 rows
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 1;
}
 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    return getvalue1.count;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
        return [getvalue1 objectAtIndex: row];
    } 
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{  
        NSLog(@"You selected this: %@", [getvalue1 objectAtIndex: row]);
        NSArray *getvalue2 =[getvalue1 objectAtIndex: row];

    }

//Picker-2 rows

-(NSInteger)numberOfComponentsInPickerView2:(UIPickerView *)pickerView{
    return 1;
}

-(NSInteger)pickerView2:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{  
    return getvalue2.count;
}

-(NSString *)pickerView2:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{     
    return [getvalue2 objectAtIndex: row];
}

-(void)pickerView2:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    NSLog(@"You selected this: %@", [getvalue2 objectAtIndex: row]);
}

问题是，在显示时，正在获得两个选项中的第一个选择值。选择器2行不会被调用。

Answer 1

只能有一组选择器视图委托方法。使用每个参数的pickerView参数来做正确的事情：

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    if (pickerView == pickerView1) {
        return getvalue1.count;
    } else {
        return getValue2.count;
    }
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if (pickerView == pickerView1) {
        return [getvalue1 objectAtIndex: row];
    } else {
        return [getvalue2 objectAtIndex: row];
    }
} 

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{  
    if (pickerView == pickerView1) {
        NSLog(@"You selected this: %@", [getvalue1 objectAtIndex: row]);
        NSArray *getvalue2 =[getvalue1 objectAtIndex: row];
    } else {
        NSLog(@"You selected this: %@", [getvalue2 objectAtIndex: row]);
    }
}