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;
Related
I got a string as mild,medium,hot.I split the string with comma as separator.I need to print it in a pickerView too.
I used the following code and got List count as 3 successfully.
NSString *spList=[mdict objectForKey:#"spicinesstype"];
NSArray *list = [spList componentsSeparatedByString:#","];
NSLog(#"List count:%d",[list count]);
return [list count];
But how could I display all 3 items in pickerview
You should set your class as the delegate of the picker view, Then implement these 3 delegate methods for your picker
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [array count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [array objectAtIndex:row];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
First you need to implement UIPickerViewDelegate and UIPickerViewDataSource by putting them on the end of the #interface line of the header file of your view controller.
Like this: #interface MyViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>
Next you need to set your view controller as the delegate and data source of you picker view. You can either do this in the - (void)viewDidLoad method of your view controller by adding the lines:
myPickerView.delegate = self;
myPickerView.dataSource = self;
Or you can link it up in Interface Builder if you are using that.
Then you need to implement these delegate methods in your View Controller source file.
(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
return 1;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
// whatever you want to happen when a row is selected.
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
return [list count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
return [list 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 made a simple picker that displays the information chose in a label on the same page. The picker is just showing ? ? ?, but when i scroll over the ? it shows the correct things chosen in the label. How do I get it to also show the words in the pickerwheel itself?
Without seeing your code, it is difficult to track down. How are you setting the information in the Label and the Picker?
If you have an array of strings which are also displayed in the Picker, then this is easy:
In the .h file, use:
#interface ViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>{
NSArray * arrayOfString;
UILabel * theLabel;
UIPicker * thePicker;
}
In the .m file, use:
#pragma mark -
#pragma mark View
- (void)viewDidLoad;{
[super viewDidLoad];
arrayOfStrings = [[NSArray alloc] initWithObjects:#"1", #"2", #"etc", nil];
}
#pragma mark -
#pragma mark Picker Delegate Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView; {
return [arrayOfStrings count];
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component; {
return 1;
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component; {
return [arrayOfStrings objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component; {
theLabel.text = [arrayOfStrings objectAtIndex:row];
}
You then hook everything up in the nib, and this should fix your problem. Hope this helps!
I have been searching method to build a UIpicker, which the row selected will lead to the change of the image of a UIbutton. The usual if, else method to change button seems does not work here. Does anyone knows how this can be done?
Here is the model code i found and i am using. How can i modify it?
Many Thanks.
#synthesize button;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
arrayColors = [[NSMutableArray alloc] init];
[arrayColors addObject:#"Orange"];
[arrayColors addObject:#"Yellow"];
[arrayColors addObject:#"Green"];
[arrayColors addObject:#"Blue"];
[arrayColors addObject:#"Indigo"];
[arrayColors addObject:#"Violet"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
// Release anything that's not essential, such as cached data
}
- (void)dealloc {
[arrayColors release];
[super dealloc];
}
#pragma mark -
#pragma mark Picker View Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [arrayColors count];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [arrayColors objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
NSLog(#"Selected Color: %#. Index of selected color: %i", [arrayColors objectAtIndex:row], row);
}
#end
In the didSelectRow method you can check to see what index was selected. Then create your if statements from there. If that isnt working for some reason then I would create an NSTimer to check the value every 1 second. If the value of the picker changes, then change the image button? Thats the first thing that popped into my head.
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger )component {
//component is the entire colomn on a picker "all of your colors"
if (component == 0) {
//row is the selected item in the colomn "orange"
if (row == 0) {
//color was selected
//change image here
}
}
}
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