CODEWITHSUNDEEP
iphoneobjective-c
aherlambang
aherlambang

Reputation: 14418

NSString and a TableView cell text

I have a string that has a value that keeps on changing/updated and I want to kind of bind this to my cell.textLabel.text. How can I do this?

This is similar to the datepicker that we have on the iphone... the cell is updated everytime we change the picker view value

Here's how I had it laid out:

@interface DatePickerViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {
    UITableView * date;
    UIDatePicker * datePicker;
    NSString * dateString;
}

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


- (IBAction)dateChangedAction:(id)sender;

@end

Upvotes: 0

Views: 399

Answers (2)

Aaron Saunders
Aaron Saunders

Reputation: 33345

Since you are using the Date Picker

// when creating datePicker object
[datePicker addTarget:self action:@selector(changeDateInCell:)
     forControlEvents:UIControlEventValueChanged];

Create method to respond to event

- (void)changeDateInCell:(id)sender{
     //Use NSDateFormatter to get string
     NSDateFormatter *df = [[NSDateFormatter alloc] init];
     df.dateStyle = NSDateFormatterMediumStyle;
     NSString * text = [NSString stringWithFormat:@"%@", 
                                        df stringFromDate:datePicker.date]];

     // do something to set the cell data with the text...

     // clean up
     [df release];

}

Upvotes: 1

TomSwift
TomSwift

Reputation: 39512

If the string is a property of some object (or can be exposed as such), I'd use a Key Value Observer (KVO). Using addObserver:forKeyPath:options:context: you can get a callback (observeValueForKeyPath:ofObject:change:context:) when the value of your property changes, and update the cell accordingly. If your cell is a custom cell you could wrap the functionality within the cell, otherwise you could place it in your view controller.

Upvotes: 0

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