Ios – Dismissing UIPickerView with Done button on UIToolBar

cocoa-touchiosobjective cuipickerviewuitoolbar

I am just trying out which is better with regards to dismissing a UIPickerView — a button on the navigation bar or a "Done" button on a toolbar above the picker view. I have implemented both buttons, and I am trying to dismiss the picker view and resign first responder.

How can I dismiss the UIPickerView with the "Done" Button on the toolbar?

This is my code for the UIToolBar:

UIToolbar* keyboardDoneButtonView = [[UIToolbar alloc] init];
keyboardDoneButtonView.barStyle = UIBarStyleBlack;
keyboardDoneButtonView.translucent = YES;
keyboardDoneButtonView.tintColor = nil;
[keyboardDoneButtonView sizeToFit];
UIBarButtonItem* doneButton = [[[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                                style:UIBarButtonItemStyleBordered target:self
                                                               action:@selector(pickerDoneClicked:)] autorelease];

[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];

textField.inputAccessoryView = keyboardDoneButtonView;

Could someone help me with this?

Best Answer

I got it working on my end, though I'm sure my test app is much much simpler in comparison, so hopefully the structure still works for yours.

In essence, this is all I did. I have a UIPickerView, UIDatePickerView, and UITextField set up in IB. The pickerView's dataSource and delegate are both linked to File's Owner, as is the delegate of the textField.

In my header, I have them all declared with the following structure

UISomething *object;
@property (nonatomic, retain) IBOutlet UISomething *object;

I've also got the protocols linked (<UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate>). In the implementation file, everything is synthesized. Then in viewDidLoad, I have this.

- (void)viewDidLoad
{
    UIToolbar* keyboardDoneButtonView = [[UIToolbar alloc] init];
    keyboardDoneButtonView.barStyle = UIBarStyleBlack;
    keyboardDoneButtonView.translucent = YES;
    keyboardDoneButtonView.tintColor = nil;
    [keyboardDoneButtonView sizeToFit];
    UIBarButtonItem* doneButton = [[[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                                    style:UIBarButtonItemStyleBordered target:self
                                                                   action:@selector(pickerDoneClicked:)] autorelease];

    [keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];

    textField.inputAccessoryView = keyboardDoneButtonView;
    [datePicker removeFromSuperview];
    [pickerView removeFromSuperview];
    [super viewDidLoad];
}

When the textField becomes active, I call this

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    [self.view addSubview:pickerView];
    [self.view addSubview:datePicker];
}

Then finally, there's the action method

- (IBAction)pickerDoneClicked:(id)sender {
    [datePicker removeFromSuperview];
    [pickerView removeFromSuperview];
    [textField resignFirstResponder];
}

This all works for me. Everything gets displayed and removed as it should. So with any luck, this will do the trick for you too

Compare method

Either you implement a compare-method for your object:

- (NSComparisonResult)compare:(Person *)otherObject {
    return [self.birthDate compare:otherObject.birthDate];
}

NSArray *sortedArray = [drinkDetails sortedArrayUsingSelector:@selector(compare:)];

NSSortDescriptor (better)

or usually even better:

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"birthDate"
                                           ascending:YES];
NSArray *sortedArray = [drinkDetails sortedArrayUsingDescriptors:@[sortDescriptor]];

You can easily sort by multiple keys by adding more than one to the array. Using custom comparator-methods is possible as well. Have a look at the documentation.

Blocks (shiny!)

There's also the possibility of sorting with a block since Mac OS X 10.6 and iOS 4:

NSArray *sortedArray;
sortedArray = [drinkDetails sortedArrayUsingComparator:^NSComparisonResult(Person *a, Person *b) {
    return [a.birthDate compare:b.birthDate];
}];

Performance

The -compare: and block-based methods will be quite a bit faster, in general, than using NSSortDescriptor as the latter relies on KVC. The primary advantage of the NSSortDescriptor method is that it provides a way to define your sort order using data, rather than code, which makes it easy to e.g. set things up so users can sort an NSTableView by clicking on the header row.

Ios – UIPickerView with done button not working

I have resolved the issue which do not know is proper way to implement or not, but it work for me. Below code for picker view with done button

-(void)createPickerView{

    pickerToolBarView = [[UIView alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height/2, self.view.frame.size.width,400)];
    [pickerToolBarView setBackgroundColor:[UIColor whiteColor]];

    UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,pickerToolBarView.frame.size.width,42)];
    toolBar.barStyle = UIBarStyleBlackOpaque;
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneTouched:)];
    [toolBar setItems:[NSArray arrayWithObjects:[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil], doneButton, nil]];

    pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0,toolBar.frame.size.height,toolBar.frame.size.width,100)];
    [pickerView setDataSource: self];
    [pickerView setDelegate: self];
    pickerView.showsSelectionIndicator = YES;
    [pickerView setBackgroundColor:[UIColor whiteColor]];

    [pickerToolBarView addSubview:toolBar];
    [pickerToolBarView addSubview:pickerView];
    [self.view addSubview:pickerToolBarView];
    [self.view bringSubviewToFront:pickerToolBarView];
    [pickerToolBarView setHidden:YES];   
}

/* Done Touched */
- (void)doneTouched:(UIBarButtonItem *)sender{
    // hide the  view
    NSLog(@"Done Touched");
    [pickerToolBarView setHidden:YES];
}

Best Answer

Related Solutions

Ios – How to sort an NSMutableArray with custom objects in it

Compare method

NSSortDescriptor (better)

Blocks (shiny!)

Performance

Ios – UIPickerView with done button not working

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