So my UIPickerView does not get connected to the DataSource. I Have no idea WHY.
I create a file with UIPickerViewDelegate and UIPickerViewDataSource, and properly do the procedure for bringing a UIPickerView on tapping a textField.
The pickerView works , but does not show any component. I have implemented
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 3;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
Any idea why the pickerView is not getting connected to the DataSource ? I also tried NSLogging inside all these methods. // Does not print
I had also set
packSizePopPickerView.delegate = self;
packSizePopPickerView.dataSource = self;
packSizePopPickerView = [[UIPickerView alloc] init];
In cellForRowAtIndexPath, you're setting packSizePopPickerView's dataSource/delegate, and THEN allocating/initializing packSizePopPickerView to a new UIPickerView. The NEW UIPickerView no longer has its delegate/dataSource set.
This is WRONG:
packSizePopPickerView.delegate = self;
packSizePopPickerView.dataSource = self;
packSizePopPickerView = [[UIPickerView alloc] init];
Try this:
packSizePopPickerView = [[UIPickerView alloc] init];
packSizePopPickerView.delegate = self;
packSizePopPickerView.dataSource = self;
You need to explicitly tell the picker what its data sources and delegates are.
myPicker.delegate = someController;
myPicker.datasource = someController;
Related
I have an array of dates ,is it possible to assign those dates as datasourse of the UIDatePicker in an iphone app ? if so, how can i do that? Thanx in advance!
UIDatePicker does not have a data source.Use UIPickerView for the purpose ,load your dates and Bang.good to go
You could try something like this:
NSString * str = [[NSString alloc]initWithFormat:#"%#",[yourDateArray objectAtIndex:0]];
yourDatePicker.date = [[NSDateFormatter alloc] init] dateFromString:str];
Hope this helps.
No you cant use a UIDatePicker like that. You can make use of UIPickerView.
use normal UIPickerView, instead of UIDatePickerView. You can create sections in UIPickerView
You will have to implement the datasource and the delegate.
once you press a button, set an array pointer to the appropriate array.
than call [thePicker reloadAllComponents];
-(IBAction) usButtonPressed:(id)sender{
self.inputArray = self.usArray;
[self.thePicker reloadAllComponents];
}
-(IBAction) mexicoButtonPressed:(id)sender{
self.inputArray = self.mexicoArray;
[self.thePicker reloadAllComponents];
}
the datasource methods:
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return [self.inputArray count];
}
the delegate methods:
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return [self.inputArray objectAtIndex:row];
}
I have a detail view with several textfields, next to one of them i have a button a user can click to pop up a single component picker. the picker is hidden till the user clicks the button. just to make sure that the basics work, I have a simple array assignd to the pickerdata. the button to show the picker works but the data doesn't show up, here is the code
- (IBAction)ButtonPressed
{
NSArray *array = [[NSArray alloc] initWithObjects:#"data", #"data 1", nil];
self.pickerData = array;
vPicker.hidden = NO;
selectButton.hidden = NO;
}
#pragma mark -
#pragma mark Picker Data Source Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return [pickerData count];
}
#pragma mark Picker Delegate Methods
- (NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
return [pickerData objectAtIndex:row];
}
Include UIPickerview datasource and delegate in the interface of your class..then set vpicker.datasource = self and vpicker.delegate= self;
How do I do that? i want to fill it with values like EURO, USD, POUND and so on and paste the value into a textfield when i tap on the corresponding row.
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
// Make a new view, or do what you want here
UIPickerView *picker = [[UIPickerView alloc]
initWithFrame:CGRectMake(0, 244, 320, 270)];
[self.view addSubview:picker];
return NO;
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
myTextField.text= [PickerArray objectAtIndex:row];
}
You should implement in your delegate method -(NSString*) pickerView:(UIPickerView*)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component that will return titles #"EURO", #"USD", #"POUND", #"RUB" for your rows.
For example,
-(NSString*) pickerView:(UIPickerView*)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
switch(component)
{
case 0:
return #"EURO";
case 1:
return #"USD";
case 2:
return #"POUND";
case 3:
return #"RUB";
}
return #"";
}
write code in your delegate method
-(NSString*) pickerView:(UIPickerView*)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return string;
}
In Array add like this #"one", #"two", #"three", #"four"
As others have already written you have to add the above mentiond delegate method to fill up your PickerView with items from an array. For writing the value into a textfield, you can do this in 2 ways. You can either do write a pickerView didSelectRow: delegate method like this:
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
myTextField.text= [myArray objectAtIndex:row];
}
This will update the textField each time you tap on a row. The other way is that you pull the value of the pickerView on a button press or on some other action. Similar to
- (void)someAction:(id)sender
{
NSInteger row = [myPicker selectedRowInComponent:0];
myTextField.text = [myArray objectAtIndex:row];
}
Hi I am developing an iphone app where I have populated a uipickerview and it works great with one uitextfield. But I have 6 uitextfield I need to populate and I am using the same uipickerview for each UItextfield.
I have working the Ipickerview loaded with array objects and it pops up when each field is touched. The problem is with the code below the UItextfields share the same data from the picker.
I can not figure out how to code so each field gets it own data from the UIPickerView row.
What Am I doing wrong? Any coding suggestions?
Thanks
#implementation BestViewController
-(NSInteger)numberOfComponentsInPickerView: (UIPickerView *)thePickerView
{ return 1; }
-(NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent: (NSInteger)component
{return [list count]; }
-(NSString *)pickerView:(UIPickerView *)thePickerview titleForRow:(NSInteger)row forComponent:(NSInteger)component
{return [list objectAtIndex:row]; }
-(void)pickerView:(UIPickerView *)thePickerview didSelectRow:(NSInteger)row inComponent: (NSInteger)component
{
uitextfield1.text = [list objectAtIndex:row];
utitextfield2.text = [list objectAtIndex:row];
}
- (void)viewDidLoad {
[super viewDidLoad];
uitextfield1.inputView = pickerView;
uitextfield2.inputView = pickerView;
list = [[NSMutableArray alloc] init];
[list addObject:#"a"];
[list addObject:#"b"];
[list addObject:#"c"];
[list addObject:#"d"];
}
You need to get hold of the current first responder and set its text property rather than explicitly setting a particular text field.
So,
-(void)pickerView:(UIPickerView *)thePickerview didSelectRow:(NSInteger)row inComponent: (NSInteger)component
{
// textFields is an NSArray holding each of the textfields that are using the picker as an input view
for (UITextField textField in textFields)
{
if ([textField isFirstResponder])
{
textField.text = [list objectAtIndex:row];
break;
}
}
}
There may be a more elegant way to find the current first responder, this is off the top of my head. textFields could possibly be an IBOutletCollection, but I haven't used those myself so I can't speak with much authority.
Here is how I would do it:
First, define several different pickers. Of course you use the same UIPickerView but you change one property that helps you distinguish them. There is different data for (almost) each text field. One convenient property that Apple designed exactly for this purpose is the tag, an arbitrary integer available to every UIView. You can assign the same tags to the UITextFields.
For example:
#define kFirstTextField 101
#define kSecondTextField 102
#define kThirdTextField 103
//... etc
In the method when the text field is touched:
[myPickerView setHidden:NO]; // or however you show the picker
[myPickerView setTag:textField.tag];
[myPickerView reloadAllComponents];
In the data methods of the picker:
-(NSString *)pickerView:(UIPickerView *)thePickerview
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
if (thePickerView.tag==kFirstTextField)
{ return [list1 count]; }
if (thePickerView.tag==kSecondTextField)
{ return [anotherOrTheSameList count]; }
// of course, you can also use a switch statement
return [defaultList count];
}
Do something similar in the titleForRow: method.
Finally, when something is picked, discriminate again by tag:
-(void) pickerView:(UIPickerView *)thePickerview
didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
{
UITextField *field = (UITextField *) [thePickerview.superview viewWithTag:thePickerview.tag];
// this assumes the UIPickerView is the subview of the same view as the UITextFields
if (thePickerview.tag==kFirstTextField)
{ field.text = [list1 objectAtIndex:row]; }
if (thePickerview.tag==kSecondTextField)
{ field.text = [anotherOrTheSameList objectAtIndex:row]; }
// etc.
// alternatively:
field.text = [self pickerView:thePickerview titleForRow:row forComponent:0];
}
Is there a way to set a default value for a picker? I save the last selected row from all the pickers and I want to be able to have the pickers load those saved rows at start up. As of now I have found this code:
[settingsPagePicker selectRow:3 inComponent:0 animated:YES];
It works but only when the user taps the picker. I need it to work when the app is first loaded. If I put this code at viewDidLoad the app will crash.
Anyone know where the proper place to put this in my code to make it work?
Thank you for your time!
Have you checked your data source for the settingsPagePicker before calling -selectRow:inComponent:animated to make sure there is data available at that index (3 in your sample code)?
How are you loading your data for your data source? You can initialize your data source in viewDidLoad first and then call selectRow once you know there is data available.
UPDATE: Here is what your code should look like or something like it:
- (void)viewDidLoad
{
[super viewDidLoad];
pickerDataSource = [[NSMutableArray alloc] init];
[pickerDataSource addObject:#"Item 01"];
[pickerDataSource addObject:#"Item 02"];
[pickerDataSource addObject:#"Item 03"];
[pickerDataSource addObject:#"Item 04"];
// Might want to move this to -viewWillAppear:animated
[settingsPagePicker selectRow:3 inComponent:0 animated:YES];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (pickerView == settingsPagePicker)
{
return [pickerDataSource objectAtIndex:row];
}
return #"";
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (pickerView == settingsPagePicker)
{
return [pickerDataSource count];
}
return 0;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView
{
return 1;
}
Here some methods from my class.
- (void)viewDidLoad {
[super viewDidLoad];
currentNumbersOfComponents = 1;
//[picker selectRow:2 inComponent:0 animated:NO];
}
- (void) viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[picker selectRow:2 inComponent:0 animated:YES];
}
#pragma mark picker view data source methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return currentNumbersOfComponents;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
return 5;
}
picker.dataSource is self