i want to show picker view with years , i am storing year array in my userDC entitly class but i am getting an error on log message
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
userdc = [years objectAtIndex:row];
NSLog(#"%d",userdc.user_year);
}
my error is like this
-[__NSCFString user_year]: unrecognized selector sent to instance 0xaaa7220
If your user_year is string then
NSLog(#"%#",userdc.user_year);
And if it is integer then
NSLog(#"%#",[NSString stringWithFormat:#"%d",userdc.user_year]);
ANd if your userdc is dictionary then use
NSLog(#"%#",[NSString stringWithFormat:#"%d",[userdc objectForKey:#"user_year"]);
yeppii .. i solved my own problem :):) by doing this, thanx all who helped me, cheers
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
userdc=[[userDC alloc]init];
userdc.user_year = [years objectAtIndex:row];
NSLog(#"%#",userdc.user_year);
}
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];
}
how is the code for picker view if i selected the any item from the Pickerview it as to show the related alert message.
exe: In picker view consists "RED",YELLOW","BLOCK","GREEN" from the picker view if i selected the RED Alert message "THIS IS RED".
so help me to solve the problem.
You can use the picker delegate method.
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
mString.text= [arrayNo objectAtIndex:row]; //mString is a NSString defined and the arrayNo is the NSArray that contain all your color data.
}
Now you have the selected value in your mString object then use that object in the alert message.
You can refer this discussion
Set a delegate and use - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
in- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
Read the Apple Doc about that:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIPickerViewDelegate_Protocol/Reference/UIPickerViewDelegate.html#//apple_ref/occ/intf/UIPickerViewDelegate
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];
}
I am trying to develop a simple search mechanism on a UIPicker. The approach I am using is to keep two arrays. My problem is that for some reason I am getting this run-time error.
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UIView numberOfComponentsInPickerView:]
Here are the array declarations.
//data source for UIPicker NSArray
*arrayCountryChoices;
//search results buffer
NSMutableArray *arraySearchResults;
//properties
#property(nonatomic,retain) NSArray*arrayCountryChoices;
#property(nonatomic,retain) NSMutableArray *arraySearchResults;
Here is where I initialize the data
//create data
arrayCountryChoices = [NSArray arrayWithObjects:#"foo",#"bar",#"baz",nil];
//copy the original array to searchable array
arraySearchResults = [arrayCountryChoices mutableCopy];
An the picker methods.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [arraySearchResults count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [arraySearchResults objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
//grab the selected country
strUserChoice = [arraySearchResults objectAtIndex:row];
}
Here is the search code for completeness although not really relevant yet as the app dies before we ever get here.
//filter on search term
NSPredicate* predicate = [NSPredicate predicateWithFormat:#"SELF beginswith[c] %#", strSearchText];
[arraySearchResults filterUsingPredicate: predicate];
[pickerCountry reloadComponent:0];
I have also dragged datasource and delegate connections from the UIPicker to Files Owner in Interface Builder.
Any ideas?
Thanks in advance.
Looks like you've got the picker's data source set to something other than the object that implements the code you've posted there—apparently a UIView somewhere. Make sure the picker's outlets point to your actual data-source object.