CODEWITHSUNDEEP
objective-ciphonecocoa-touchuipickerview
Steve Gibson
Steve Gibson

Reputation: 801

Select row After UIPickerView is loaded

I have an iPhone database app that loads a UIPickerView with data from a table. I want to set the selected row to a particular row from the data in another table.

For example: Let's say I have a UIPickerView that is loaded with X number of names of the iPhone users' friends (the number of names is variable; it could be 1 or 1000 and all are entered into the database by the user). The iPhone user has a preference set that their current best friend is TED. I want the UIPickerView to be position to TED when displayed.

Where do I call selectRow?

I tried in viewDidAppear, but it was never called, in titleForRow which caused all kinds of strange behavior. viewDidLoad and viewWillAppear are out of the question, because I don't know what's in the datasource to the picker yet.

Upvotes: 78

Views: 91186

Answers (6)

Er. Vihar
Er. Vihar

Reputation: 1555

For Swift it's simply:

self.picker?.selectRow(0, inComponent: 0, animated: true)

Upvotes: 4

user1760527
user1760527

Reputation: 1164

If you want the selected row permanently highlighted use this 

myPickerView.subviews[0].subviews[0].subviews[2].backgroundColor = myPickerView.tintColor;

Upvotes: 0

Blake Watters
Blake Watters

Reputation: 6617

I have just found that on the 4.3 SDK's the component loading behaviors are different between the iPhone and the iPad. On the iPhone, I was about to invoke selectRow: right after initializing the view before or after adding to the subview hierarchy. On iPad however, the selectRow call yielded no results. I wound up using a performSelector:withObject:afterDelay: call to wait 0.1 seconds before firing selectRow:inComponent:animated:. This had predictable results on the iPhone and iPad.

Upvotes: 4

nspire
nspire

Reputation: 1731

There is a common issue when a (default) UIPickerView item needs to be selected when the UIPickerView is initially shown. The problem is related to the sequence of events. From reading previous posts, it seems that the [pickerView selectRow:n] is normally called in the view controllers ViewDidLoad event. However, the UiPickerView data is only loaded after the ViewDidLoad event, which means any selection code in ViewDidLoad will have no effect. To remedy, place the selection code in ViewDidAppear;

- (void) viewDidAppear:(BOOL)animated {
[m_pickerView selectRow:nSelectedItem inComponent:0 animated:YES]; }

Upvotes: 44

Alex Reynolds
Alex Reynolds

Reputation: 97004

Place this wherever you initialize the UIView that contains your UIPickerView as a subview:

[myPickerView selectRow:rowWithTedsName inComponent:columnWithNames animated:NO];

Upvotes: 7

Jab
Jab

Reputation: 13775

Call it after you retrieve the data. I don't know where you load the data so this is just a mockup of what should work. If this doesn't make sense, let me know where you are loading data so I can piece it together in my head :)

-(void)viewDidLoad
{
    // load data from sql
    // self.someDataArray = DATAFROMSQL
    [picker reloadAllComponents];
    [picker selectRow:0 inComponent:0 animated:YES];
}

Upvotes: 141

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