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Hiding/ Showing UIPickerView

2013年10月01日 ⁄ 综合 ⁄ 共 1750字 ⁄ 字号 小 中 大 ⁄ 评论关闭

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I Have an a touchesEnded event that checks for when a UITextField is pressed. What I would like it to do is is hide/show a UIPickerView. How can this be done?

- (void)touchesEnded :( NSSet *)touches withEvent :( UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
if (CGRectContainsPoint([self.textField frame], [touch locationInView:self.view]))
{
    NSString * error = @"Touched the TextField";
    UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Selection!" message:error delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
    //Want to show or hide UIPickerView
}

}

I already have an allocated UIPickerView when touches occur

@interface ThirdViewController : UIViewController <UITextFieldDelegate,UIPickerViewDelegate> {


IBOutlet UIPickerView *pickerView;

}

 
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3 Answers

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UIPickerView inherits from UIView, so you should be able to just toggle its 'hidden' property:

if (pickerView) pickerView.hidden = !pickerView.hidden;
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Crude, but works. – Kyle Sep
4 '12 at 22:40

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Toggling the "hidden" property will do the trick, but will also give a very abrupt reveal.

One way to avoid this is to get the picker to slide up from the bottom of the screen by embedding it inside a UIActionSheet.

Here's an example:

    UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil

delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];


    CGRect pickerFrame = CGRectMake(0, 0, 0, 0);

    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];

    pickerView.showsSelectionIndicator = YES;

    pickerView.dataSource = self;

    pickerView.delegate = self;

    [sheet addSubview:pickerView];

    [pickerView release];


    [sheet showInView:view];

    [sheet setBounds:CGRectMake(0, 0, 320
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