如何将选择器视图的指示器设置为特定值

Question

My cell is containing a button when you click a button, the picker view will pop op just like an image below

Question :

How can I change so that the indicator will move to the correct value which is shown in my button.

For example, my button is showing 8 and if you tap on it, the picker view will be popped up with indicator choosing 8.

If you know how to customize this. please advice me on this issue. Thanks

Answer 1

You can implement the following:

- (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated

You can use it by adding an IBAction for the button.

-(IBAction)userTappedNumber{
    //Call your picker view's method here.
    [self.pickerView selectRow:8 inComponent:0 animated:YES];
}

For future reference try taking a look at Apple's references and searching for similar questions via google and the Stack Overflow search before asking simple questions. Apple's UIPickerView Class Reference

Answer 2

使用这种方法

- (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated

Answer 3

There is a way to find a specific value without knowing its position in the array.

First, convert the value that you want to look for to string

stringValue = [NSString stringWithFormat:@"%d",intValue];

Second, create a loop to find the value in the array and select it:

int i = 0;
    for(NSString* number in arrayName)
    {
        if ([stringValue isEqualToString:number]){
            [pickerViewName selectRow:i inComponent:0 animated:YES ];
        }
        i++;
    }