uipickerview

问题 I need to add a toolbar with done button on the top of UIPickerView . I don't want to use actionSheet because I want the rest of the view to be active. I've gone for the following code: - (BOOL)textFieldDidBeginEditing:(UITextField *)textField { [txtstate resignFirstResponder]; pickerView = [[UIPickerView alloc]init] ; pickerView.frame=CGRectMake(10, 75, 180,20); pickerView.delegate = self; pickerView.showsSelectionIndicator = YES; UIToolbar* toolbar = [[UIToolbar alloc] init]; toolbar.frame

问题 I need to add a toolbar with done button on the top of UIPickerView . I don't want to use actionSheet because I want the rest of the view to be active. I've gone for the following code: - (BOOL)textFieldDidBeginEditing:(UITextField *)textField { [txtstate resignFirstResponder]; pickerView = [[UIPickerView alloc]init] ; pickerView.frame=CGRectMake(10, 75, 180,20); pickerView.delegate = self; pickerView.showsSelectionIndicator = YES; UIToolbar* toolbar = [[UIToolbar alloc] init]; toolbar.frame

问题 I try to select a row in my PickerView but it doesn't works. It stays at the first row. Here is my code: @IBOutlet weak var pickerView: UIDatePicker! func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int { return 1 } func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int { return 10 } func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String!{ return String(row + 1) } //In viewDidLoad pickerView

问题 I just discovered that if I do the following: Click the button that animates a UIPickerView into my view Quickly start the wheel rolling towards, then past, the last item Dismiss the view with a button Then it has not yet selected the last item yet. I tried this by simply outputting to the console whenever the didSelectRow method was fired, and it fires when the wheel stabilizes on the last item. Can I detect that the wheel is still rolling, so that I can delay checking it for a selected

问题 I am trying to show UIPickerView with UIToolBar but getting some error. Here is my code - CGRect toolbarTargetFrame = CGRectMake(0, self.view.bounds.size.height-216-44, 320, 44); CGRect datePickerTargetFrame = CGRectMake(0, self.view.bounds.size.height-216, 320, 216); UIView *darkView = [[UIView alloc] initWithFrame:self.view.bounds]; darkView.alpha = 0; darkView.backgroundColor = [UIColor blackColor]; darkView.tag = 9; UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]

问题 Below code will change the font colour of the picker view of all 3 components. However, it crash when I try to spin the wheel. I think it has to do with the didSelectRow function. Maybe the two function have to be nested somehow? Any idea? func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? { var attributedString: NSAttributedString! if component == 0 { attributedString = NSAttributedString(string: a.text!, attributes:

问题 Below code will change the font colour of the picker view of all 3 components. However, it crash when I try to spin the wheel. I think it has to do with the didSelectRow function. Maybe the two function have to be nested somehow? Any idea? func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? { var attributedString: NSAttributedString! if component == 0 { attributedString = NSAttributedString(string: a.text!, attributes:

问题 I have been beating my head against the wall trying to diagnose my app's inability to automatically preselect the last row of a UIPickerView using code that successfully worked under older versions of XCode. I think this is a bug in Xcode rather than iOS 6 because my old app running on an iOS 6 device works properly, but recompiling the code under Xcode 4.5.2 does not behave properly. I have put together the following sample to demonstrate the problem, but before I submit a bug report, I

问题 A number of posts are dealing with the subject: How to make an inline UIPickerView. As I am lazy, can anyone point me to a code snippet. To be honest, I find the Apple DateCell sample pedantic - there has to be an a more elegant method. Is the dateCell app a good place to start? or are there other better links. I would appreciate any advice. If you read this and do not understand my requirements / goal, please see the two posts referenced above or simply download the Apple Sample (dev.

问题 Is there a way to make the UIPickerView only Read Only? This means that the user cannot flip through the options. PS. This is not the same as not passing anything in the didSelectRow method because I only want the user to see that the picker is there and not to touch it. 回答1: Set the picker's userInteractionEnabled to NO. 回答2: Use this to make it not interactable [pickerObj setUserInteractionEnabled:NO]; and this to [pickerObj setAlpha:.6]; fade the opacity so it looks non-interactable 回答3: