How to set a default Value of a UIPickerView

TL:DR version:

//Objective-C[self.picker selectRow:2 inComponent:0 animated:YES];//Swiftpicker.selectRow(2, inComponent:0, animated:true)

Either you didn't set your picker to select the row (which you say you seem to have done but anyhow):

- (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated

OR you didn't use the the following method to get the selected item from your picker

- (NSInteger)selectedRowInComponent:(NSInteger)component

This will get the selected row as Integer from your picker and do as you please with it.This should do the trick for yah. Good luck.

Anyhow read the ref:https://developer.apple.com/documentation/uikit/uipickerview

EDIT:

An example of manually setting and getting of a selected row in a UIPickerView:

the .h file:

#import <UIKit/UIKit.h>@interface ViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>{    UIPickerView *picker;    NSMutableArray *source;}@property (nonatomic,retain) UIPickerView *picker;@property (nonatomic,retain) NSMutableArray *source;-(void)pressed;@end

the .m file:

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController@synthesize picker;@synthesize source;- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)viewDidUnload{    [super viewDidUnload];    // Release any retained subviews of the main view.}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return YES;}- (void) viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];    self.view.backgroundColor = [UIColor yellowColor];    self.source = [[NSMutableArray alloc] initWithObjects:@"EU", @"USA", @"ASIA", nil];    UIButton *pressme = [[UIButton alloc] initWithFrame:CGRectMake(20, 20, 280, 80)];    [pressme setTitle:@"Press me!!!" forState:UIControlStateNormal];    pressme.backgroundColor = [UIColor lightGrayColor];    [pressme addTarget:self action:@selector(pressed) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:pressme];    self.picker = [[UIPickerView alloc] initWithFrame:CGRectMake(20, 110, 280, 300)];    self.picker.delegate = self;    self.picker.dataSource = self;    [self.view addSubview:self.picker];    //This is how you manually SET(!!) a selection!    [self.picker selectRow:2 inComponent:0 animated:YES];}//logs the current selection of the picker manually-(void)pressed{    //This is how you manually GET(!!) a selection    int row = [self.picker selectedRowInComponent:0];    NSLog(@"%@", [source objectAtIndex:row]);}- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 1;}- (NSInteger)pickerView:(UIPickerView *)pickerViewnumberOfRowsInComponent:(NSInteger)component{    return [source count];}- (NSString *)pickerView:(UIPickerView *)pickerView             titleForRow:(NSInteger)row            forComponent:(NSInteger)component{    return [source objectAtIndex:row];}#pragma mark -#pragma mark PickerView Delegate-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row      inComponent:(NSInteger)component{//    NSLog(@"%@", [source objectAtIndex:row]);}@end

EDIT for Swift solution (Source: Dan Beaulieu's answer)

Define an Outlet:

@IBOutlet weak var pickerView: UIPickerView!  // for example

Then in your viewWillAppear or your viewDidLoad, for example, you can use the following:

pickerView.selectRow(rowMin, inComponent: 0, animated: true)pickerView.selectRow(rowSec, inComponent: 1, animated: true)

If you inspect the Swift 2.0 framework you'll see .selectRow defined as:

func selectRow(row: Int, inComponent component: Int, animated: Bool) 

option clicking .selectRow in Xcode displays the following:

This is How to set a default Value of a UIPickerView

[self.picker selectRow:4 inComponent:0 animated:YES];

Swift solution:

Define an Outlet:

@IBOutlet weak var pickerView: UIPickerView!  // for example

Then in your viewWillAppear or your viewDidLoad, for example, you can use the following:

pickerView.selectRow(rowMin, inComponent: 0, animated: true)pickerView.selectRow(rowSec, inComponent: 1, animated: true)

If you inspect the Swift 2.0 framework you'll see .selectRow defined as:

func selectRow(row: Int, inComponent component: Int, animated: Bool) 

option clicking .selectRow in Xcode displays the following: