How to change UIPickerView height

问题:

Is it possible to change the height of UIPickerView? Some applications seem to have shorter PickerViews but setting a smaller frame doesn\'t seem to work and the frame is locked in Interface Builder.

回答1:

It seems obvious that Apple doesn\'t particularly invite mucking with the default height of the UIPickerView, but I have found that you can achieve a change in the height of the view by taking complete control and passing a desired frame size at creation time, e.g:

smallerPicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 120.0)];

You will discover that at various heights and widths, there are visual glitches. Obviously, these glitches would either need to be worked around somehow, or choose another size that doesn\'t exhibit them.

回答2:

None of the above approaches work in iOS 4.0

The pickerView\'s height is no longer re-sizable. There is a message which gets dumped to console if you attempt to change the frame of a picker in 4.0:

-[UIPickerView setFrame:]: invalid height value 66.0 pinned to 162.0 

I ended up doing something quite radical to get the effect of a smaller picker which works in both OS 3.xx and OS 4.0. I left the picker to be whatever size the SDK decides it should be and instead made a cut-through transparent window on my background image through which the picker becomes visible. Then simply placed the picker behind (Z Order wise) my background UIImageView so that only a part of the picker is visible which is dictated by the transparent window in my background.

回答3:

There are only three valid heights for UIPickerView (162.0, 180.0 and 216.0).

You can use the CGAffineTransformMakeTranslation and CGAffineTransformMakeScale functions to properly fit the picker to your convenience.

Example:

CGAffineTransform t0 = CGAffineTransformMakeTranslation (0, pickerview.bounds.size.height/2);
CGAffineTransform s0 = CGAffineTransformMakeScale       (1.0, 0.5);
CGAffineTransform t1 = CGAffineTransformMakeTranslation (0, -pickerview.bounds.size.height/2);
pickerview.transform = CGAffineTransformConcat          (t0, CGAffineTransformConcat(s0, t1));

The above code change the height of picker view to half and re-position it to the exact (Left-x1, Top-y1) position.

回答4:

Try:

pickerview.transform = CGAffineTransformMakeScale(.5, 0.5);

回答5:

In iOS 4.2 & 4.3 the following works:

UIDatePicker *datePicker = [[UIDatePicker alloc] init];
datePicker.frame = CGRectMake(0, 0, 320, 180);
[self addSubview:datePicker];

The following does not work:

UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 0, 320, 180)];
[self addSubview:datePicker];

I have an app that is in the app store with a 3 line date picker. I thought the height change may have been prevented because you see the text under the date picker\'s border, but this happens to the normal 216 height date picker too.

Which is the bug? Your guess is as good as mine.

Also there are 3 valid heights for UIDatePicker (and UIPickerView) 162.0, 180.0, and 216.0. If you set a UIPickerView height to anything else you will see the following in the console when debugging on an iOS device.

2011-09-14 10:06:56.180 DebugHarness[1717:707] -[UIPickerView setFrame:]: invalid height value 300.0 pinned to 216.0

回答6:

As of iOS 9, you can freely change UIPickerView\'s width and height. No need to use the above mentioned transform hacks.

回答7:

I have found that you can edit the size of the UIPickerView - just not with interface builder. open the .xib file with a text editor and set the size of the picker view to whatever you want. Interface builder does not reset the size and it seems to work. I\'m sure apple locked the size for a reason so you\'ll have to experiment with different sizes to see what works.

回答8:

Advantages:

1. Makes setFrame of UIPickerView behave like it should
2. No transform code within your UIViewController
3. Works within viewWillLayoutSubviews to rescale/position the UIPickerView
4. Works on the iPad without UIPopover
5. The superclass always receives a valid height
6. Works with iOS 5

Disadvantages:

1. Requires you to subclass UIPickerView
2. Requires the use of pickerView viewForRow to undo the transformation for the subViews
3. UIAnimations might not work

Solution:

Subclass UIPickerView and overwrite the two methods using the following code. It combines subclassing, fixed height and the transformation approach.

#define FIXED_PICKER_HEIGHT 216.0f
- (void) setFrame:(CGRect)frame
{
    CGFloat targetHeight = frame.size.height;
    CGFloat scaleFactor = targetHeight / FIXED_PICKER_HEIGHT;
    frame.size.height = FIXED_PICKER_HEIGHT;//fake normal conditions for super
    self.transform = CGAffineTransformIdentity;//fake normal conditions for super
    [super setFrame:frame];
    frame.size.height = targetHeight;
    CGFloat dX=self.bounds.size.width/2, dY=self.bounds.size.height/2;
    self.transform = CGAffineTransformTranslate(CGAffineTransformScale(CGAffineTransformMakeTranslation(-dX, -dY), 1, scaleFactor), dX, dY);
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    //Your code goes here

    CGFloat inverseScaleFactor = FIXED_PICKER_HEIGHT/self.frame.size.height;
    CGAffineTransform scale = CGAffineTransformMakeScale(1, inverseScaleFactor);
    view.transform = scale;
    return view;
}

回答9:

An easy way to change the visible height of a picker view is to embed the picker in a UIView, adjust the parent view\'s height to the height you want to see of the picker, then enable \"Clip Subviews\" in Interface Builder on the parent UIView or set view.clipsToBounds = true in code.

回答10:

I wasn\'t able to follow any of the above advice.

I watched multiple tutorials and found this one the most beneficial:

I added the following code to set the new height inside the \"viewDidLoad\" method, which worked in my app.

UIPickerView *picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 120.0)]; 
[self.view addSubview:picker];
picker.delegate = self;
picker.dataSource = self;

Hope this was helpful!

回答11:

This has changed a lot in iOS 9 (in iOS 8 it\'s pretty similar to what we\'re seeing here). If you can afford to target iOS 9 only, then you resize the UIPickerView as you see fit, by setting its frame. Good!

Here it is from iOS 9 Release Notes

UIPickerView and UIDatePicker are now resizable and adaptive—previously, these views would enforce a default size even if you attempted to resize them. These views also now default to a width of 320 points on all devices, instead of to the device width on iPhone.

Interfaces that rely on the old enforcement of the default size will likely look wrong when compiled for iOS 9. Any problems encountered can be resolved by fully constraining or sizing picker views to the desired size instead of relying on implicit behavior.

回答12:

I am working with ios 7, Xcode 5. I was able to adjust the height of date picker indirectly by enclosing it in a view. The container views height can be adjusted.

回答13:

Even thought it is not resizing, another trick may help in the situation when the UIPicker is located at the bottom of the screen.

One can try moving it slightly downwards, but the central row should remain visible. This will help reveal some space above the picker since bottom rows will be offscreen.

I repeat that this is not the way of changing UIPicker view\'s height but some idea on what you can do if all other attempts fail.

回答14:

Ok, after struggling for a long time with the stupid pickerview in iOS 4, I\'ve decided to change my control into simple table: here is the code:

ComboBoxView.m = which is actually looks more like pickerview.

//
//  ComboBoxView.m
//  iTrophy
//
//  Created by Gal Blank on 8/18/10.
//

#import \"ComboBoxView.h\"
#import \"AwardsStruct.h\"


@implementation ComboBoxView

@synthesize displayedObjects;

#pragma mark -
#pragma mark Initialization

/*
- (id)initWithStyle:(UITableViewStyle)style {
    // Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
    if ((self = [super initWithStyle:style])) {
    }
    return self;
}
*/


#pragma mark -
#pragma mark View lifecycle

/*
- (void)viewDidLoad {
    [super viewDidLoad];

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
*/

/*
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
}
*/
/*
- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
}
*/
/*
- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/


#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    return 1;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
    return [[self displayedObjects] count];
}


// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {


    NSString *MyIdentifier = [NSString stringWithFormat:@\"MyIdentifier %i\", indexPath.row];

    UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease];
        //cell.contentView.frame = CGRectMake(0, 0, 230.0,16);
        UILabel *label = [[[UILabel alloc] initWithFrame:CGRectMake(0, 5, 230.0,19)] autorelease];
        VivatAwardsStruct *vType = [displayedObjects objectAtIndex:indexPath.row];
        NSString *section = [vType awardType]; 
        label.tag = 1;
        label.font = [UIFont systemFontOfSize:17.0];
        label.text = section;
        label.textAlignment = UITextAlignmentCenter;
        label.baselineAdjustment = UIBaselineAdjustmentAlignCenters;
        label.adjustsFontSizeToFitWidth=YES;
        label.textColor = [UIColor blackColor];
        //label.autoresizingMask = UIViewAutoresizingFlexibleHeight;
        [cell.contentView addSubview:label]; 
        //UIImage *image = nil;
        label.backgroundColor = [UIColor whiteColor];
        //image = [awards awardImage];
        //image = [image imageScaledToSize:CGSizeMake(32.0, 32.0)];

        //[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
        //UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
        //cell.accessoryView = imageView;
        //[imageView release];
    }

    return cell;
}


/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/


/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/


/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/


/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/


#pragma mark -
#pragma mark Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@\"<#Nib name#>\" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];
     */
}


#pragma mark -
#pragma mark Memory management

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn\'t have a superview.
    [super didReceiveMemoryWarning];

    // Relinquish ownership any cached data, images, etc that aren\'t in use.
}

- (void)viewDidUnload {
    // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
    // For example: self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}


@end

Here is the .h file for that:

//
//  ComboBoxView.h
//  iTrophy
//
//  Created by Gal Blank on 8/18/10.
//

#import <UIKit/UIKit.h>


@interface ComboBoxView : UITableViewController {
    NSMutableArray *displayedObjects;
}

@property (nonatomic, retain) NSMutableArray *displayedObjects;


@end

now, in the ViewController where I had Apple UIPickerView I replaced with my own ComboBox view and made it size what ever I wish.

ComboBoxView *mypickerholder = [[ComboBoxView alloc] init]; 
[mypickerholder.view setFrame:CGRectMake(50, 220, 230, 80)];
[mypickerholder setDisplayedObjects:awardTypesArray];

that\'s it, now the only thing is left is to create a member variable in the combobox view that will hold current row selection, and we are good to go.

Enjoy everyone.

回答15:

You can not generally do it in xib or setting frame programtically but if you open its parent xib as source and change height from there then it works.Right click the xib within which pickerview is contained,Search pickerview and you can find height,width etc in that tag,Change height there then save file.

<pickerView contentMode=\"scaleToFill\" id=\"pai-pm-hjZ\">
                                    <rect key=\"frame\" x=\"0.0\" y=\"41\" width=\"320\" height=\"100\"/>
                                    <autoresizingMask key=\"autoresizingMask\" widthSizable=\"YES\" flexibleMaxY=\"YES\"/>
                                    <connections>
                                        <outlet property=\"dataSource\" destination=\"-1\" id=\"Mo2-zp-Sl4\"/>
                                        <outlet property=\"delegate\" destination=\"-1\" id=\"nfW-lU-tsU\"/>
                                    </connections>
                                </pickerView>

回答16:

Create a view in IB or code. Add your picker as a subview of this view. Resize the view. This is easiest to do in IB. Create constraints from the view to its superview and from the picker to this new view.

Since the Picker curves around it spills out over the top and bottom of the view. You can see in IB when you add top and bottom constraints from the picker to the view it shows a standard space something like 16 points above and below the superview container. Set the view to clip it if you don\'t want this behaviour (ugly warning).

Here\'s what it looks like at 96 points high on an iPhone 5. The picker with the spillover is about 130 points high. Pretty skinny!

I\'m using this in my project to prevent the picker from spreading out to an unnecessary height. This technique trims it down and forces a tighter spill over. It actually looks slicker to be a bit more compact.

Here\'s an image of the view showing the spillover.

Here\'s the IB constraints I added.

回答17:

As far as I know, it\'s impossible to shrink the UIPickerView. I also haven\'t actually seen a shorter one used anywhere. My guess is that it was a custom implementation if they did manage to shrink it.

回答18:

See my answer to this question: UIPicker sizing in landscape mode

回答19:

If you want to create your picker in IB, you can post-resize it to a smaller size. Check to make sure it still draws correctly though, as there comes a point where it looks heinous.

回答20:

Swift: You need to add a subview with clip to bounds

    var DateView = UIView(frame: CGRectMake(0, 0, view.frame.width, 100))
    DateView.layer.borderWidth=1
    DateView.clipsToBounds = true

    var myDatepicker = UIDatePicker(frame:CGRectMake(0,-20,view.frame.width,162));
    DateView.addSubview(myDatepicker);
    self.view.addSubview(DateView)

This should add a clipped 100 height date picker in the top of the view controller.

回答21:

My trick: use datepicker\'s mask layer to make datePicker some part visible. as you see just like change the datepicke\'s frame.

- (void)timeSelect:(UIButton *)timeButton {
UIDatePicker *timePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, 550)];
timePicker.backgroundColor = [UIColor whiteColor];
timePicker.layer.mask = [self maskLayerWithDatePicker:timePicker];
timePicker.layer.masksToBounds = YES;
timePicker.datePickerMode = UIDatePickerModeTime;
[self.view addSubview:timePicker];
}

- (CALayer *)maskLayerWithDatePicker:(UIDatePicker *)datePicker {
CAShapeLayer *shapeLayer = [[CAShapeLayer alloc] init];
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, datePicker.width*0.8, datePicker.height*0.8) cornerRadius:10];
shapeLayer.path = path.CGPath;
return shapeLayer;
}

回答22:

I use a mask layer to change it\'s display size

// swift 3.x
let layer = CALayer()
layer.frame = CGRect(x: 0,y:0, width: displayWidth, height: displayHeight)
layer.backgroundColor = UIColor.red.cgColor
pickerView.layer.mask = layer

回答23:

Embed in a stack view. Stack view is a component recently added by Apple in their iOS SDK to reflect grid based implementations in java script web based front end libraries such as bootstrap.

回答24:

After a long day of scratching my head, I\'ve found something that works for me. The codes below will recreate the UIDatePicker everytime the user change the phone orientation. This will remove whatever glitches that the UIDatePicker have after an orientation change.

Since we are recreating the UIDatePicker, we need an instance variable that will keep the selected date value. The codes below are tested on iOS 4.0.

    @interface AdvanceDateViewController : UIViewController<UIPickerViewDelegate> {
        UIDatePicker *datePicker;
        NSDate *date;
    }


    @property (nonatomic, retain) UIDatePicker *datePicker;
    @property (nonatomic, retain) NSDate *date;

    -(void)resizeViewWithOrientation:(UIInterfaceOrientation) orientation;

    @end

    @implementation AdvanceDateViewController
    @synthesize datePicker, date;

    - (void)viewDidLoad {
      [super viewDidLoad];
          [self resizeViewWithOrientation:self.interfaceOrientation];
    }


    -(void)viewWillAppear:(BOOL)animated{
         [super viewWillAppear:animated];
         [self resizeViewWithOrientation:self.interfaceOrientation];
     }

     - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
         return YES;
     }

     -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
      [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
      [self resizeViewWithOrientation:toInterfaceOrientation];
      }

     -(void)resizeViewWithOrientation:(UIInterfaceOrientation) orientation{
          [self.datePicker removeFromSuperview];
          [self.datePicker removeTarget:self action:@selector(refreshPickupDate) forControlEvents:UIControlEventValueChanged];
          self.datePicker = nil;

          //(Re)initialize the datepicker, thanks to Apple\'s buggy UIDatePicker implementation
          UIDatePicker *dummyDatePicker = [[UIDatePicker alloc] init];
          self.datePicker = dummyDatePicker;
          [dummyDatePicker release];

          [self.datePicker setDate:self.date animated:YES];
          [self.datePicker addTarget:self action:@selector(refreshPickupDate) forControlEvents:UIControlEventValueChanged];

          if(UIInterfaceOrientationIsLandscape(orientation)){
                 self.datePicker.frame = CGRectMake(0, 118, 480, 162);    
           } else {
                 self.datePicker.frame = CGRectMake(0, 200, 320, 216);
           }

           [self.view addSubview:self.datePicker];
           [self.view setNeedsDisplay];
      }

      @end

回答25:

stockPicker = [[UIPickerView alloc] init];
stockPicker.frame = CGRectMake(70.0,155, 180,100);

If You want to set the size of UiPickerView. Above code is surely gonna work for u.

回答26:

In iOS 5.0, I got the following to work:

UIDatePicker *picker = [[UIDatePicker alloc] init];
picker.frame = CGRectMake(0.0, 0.0, 320.0, 160.0);

This created a date picker like the one Apple uses in the Calendar app when creating a new event in landscape mode. (3 rows high instead of 5.) This didn\'t work when I set the frame within the initWithFrame: method, but so far works when setting it using a separate method.

回答27:

for iOS 5:

if you take a quick look at the UIPickerView Protocol Reference

you\'ll find

– pickerView:rowHeightForComponent:
– pickerView:widthForComponent:

I think is the first one you\'re looking for