mutating method sent to immutable object NSUserDefaults http://stackoverflow.com/questions/5790715/mutating-method-sent-to-immutable-object

http://stackoverflow.com/questions/5790715/mutating-method-sent-to-immutable-object

mutating method sent to immutable object NSUserDefaults

When I use this method first time it works fine, but when I called it second time I get the error "mutating method sent to immutable object". The problem is at line with "addObject" command.

  -(IBAction) save: (id) sender{    NSMutableArray *placesT= [[NSUserDefaults standardUserDefaults] objectForKey:@"placesT"];    if (!placesT) {      placesT=[[[NSMutableArray alloc] init] autorelease];  }    [placesT addObject: [NSString stringWithFormat:@"%@", tagF.text] ];    NSUserDefaults *tUD=[NSUserDefaults standardUserDefaults];  [tUD setObject:placesT forKey:@"placesT"];  [tUD synchronize];    [self dismissModalViewControllerAnimated:YES];

}

That is because the object stored in the NSUserDefaults is not the mutableArray but a normal array.

  -(IBAction) save: (id) sender{       NSMutableArray *placesT= nil;     NSrray *tempArray = [[NSUserDefaults standardUserDefaults] objectForKey:@"placesT"];    if (tempArray) {      placeT = [tempArray mutableCopy];  } else {      placesT=[[NSMutableArray alloc] init];  }    [placesT addObject: [NSString stringWithFormat:@"%@", tagF.text] ];    NSUserDefaults *tUD=[NSUserDefaults standardUserDefaults];  [tUD setObject:placesT forKey:@"placesT"];  [tUD synchronize];    [self dismissModalViewControllerAnimated:YES];  [placesT releae];  }

   placesT is a non mutable array, either always set placesT a mutable object always or use following code.

  NSMutableArray *placesT= [[[NSUserDefaults standardUserDefaults] objectForKey:@"placesT"] mutableCopy];




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Get underlying NSData* from UIImage http://stackoverflow.com/questions/4623931/get-underlying-nsdata-from-uiimage

http://stackoverflow.com/questions/4623931/get-underlying-nsdata-from-uiimage

Get underlying NSData* from UIImage

I can create UIImage from NSData using [UIImage imageWithdata:] or [UIImage initWithData] method.

I wonder if I can get the NSData* back from an existing UIImage* ?
something on the line of NSData* myData = [myImage getData];

Is this impossible?
Thank you

  NSData *imageData = UIImageJPEGRepresentation(image, 0.7); // 0.7 is JPG quality

or

  NSData *imageData = UIImagePNGRepresentation(image);

Depending if you want your data in PNG format or JPG format.

UISegmentedControl in the Navigation Bar with the Back button http://stackoverflow.com/questions/15383014/uisegmentedcontrol-in-the-navigation-bar-with-the-back-button

http://stackoverflow.com/questions/15383014/uisegmentedcontrol-in-the-navigation-bar-with-the-back-button

UISegmentedControl in the Navigation Bar with the Back button

I'm adding a UISegmentedControl to the Navigation bar programatically where the titleViewshould be. But as Apple docs have mentioned under titleView, This property is ignored if leftBarButtonItem is not nil. But I want to have the back button as well. Like they have illustrated in their own images! Below is the code I add the UISegmentedControl. self.navigationItem.leftBarButtonItem = nil; UISegmentedControl *statFilter = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"Filter_Personnal", @"Filter_Department", @"Filter_Company", nil]; [statFilter setSegmentedControlStyle:UISegmentedControlStyleBar]; self.navigationItem.titleView = statFilter; Is there another way to add a UISegmentedControl along with the Back button as well? Thank you. ios objective-c uinavigationcontroller uinavigationbar uisegmentedcontrol share|improve this question asked Mar 13 at 10:42 Isuru 1,04811031

2 Answers

activeoldestvotes

up vote1down vote

You can create a UIBarButtonItem with a custom view which could potentially be yourUISegmentedControl. Something along the lines of the following may work. //create segmented control with items UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"One", @"Two", nil]]; //create bar button item with segmented control as custom view UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl]; //add segmented control bar button item to navigation bar [[[self navigationController] navigationItem] setRightBarButtonItem:barButtonItem]; I haven't tested this but it should be along the right lines of what you need. share|improve this answer answered Mar 13 at 10:48 CaptainRedmuff 1,316419

Hi thanks for the response. In the meantime I was waiting, I slapped together a small program to test it out. I put 2 View Controllers, a button in the first one to segue to the other one. And in the ViewDidLoad method of the second View Controller, I created the UISegmentedControl using the code I've posted in my question andvoila! It works! I don't know why Apple has said it won't work. :S – Isuru Mar 13 at 11:10

up vote0down vote

Try this Remove this line --- > self.navigationItem.leftBarButtonItem = nil; Add this instead UISegmentedControl *statFilter = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"Filter_Personnal", @"Filter_Department", @"Filter_Company", nil]]; [statFilter setSegmentedControlStyle:UISegmentedControlStyleBar]; [statFilter sizeToFit]; self.navigationItem.titleView = statFilter; Only change is I have added this line : [statFilter sizeToFit]; Hope this Helps !!!