After setting UITextView's text property, screen does not update accordingly - objective-c

Question

I have view controllers A(FileListViewController) and B(TextFileViewController). A is a UITableViewController. What I am doing now is that after selecting a row in controller A, I load a text file and display that text in a UITextView in controller B.
The following is the header and implementation part(some code is abridged) of my the two controllers.
FileListViewcontroller Interface:
#interface FileListViewController : UITableViewController {
NSMutableArray * fileList;
DBRestClient* restClient;
TextFileViewController *tfvc;
}
#property (nonatomic, retain) NSMutableArray * fileList;
#property (nonatomic, retain) TextFileViewController *tfvc;
#end
FileListViewController Implementation:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
DBMetadata *metaData = [fileList objectAtIndex:indexPath.row];
if(!metaData.isDirectory){
if([Utils isTextFile:metaData.path]){
if(!tfvc){
tfvc = [[TextFileViewController alloc] init];
}
[self restClient].delegate = self;
[[self restClient] loadFile:metaData.path intoPath:filePath];
[self.navigationController pushViewController:tfvc animated:YES];
}
}
- (void)restClient:(DBRestClient*)client loadedFile:(NSString*)destPath {
NSError *err = nil;
NSString *fileContent = [NSString stringWithContentsOfFile:destPath encoding:NSUTF8StringEncoding error:&err];
if(fileContent) {
[tfvc updateText:fileContent];
} else {
NSLog(#"Error reading %#: %#", destPath, err);
}
}
And here is the interface for TextFileViewController：
#interface TextFileViewController : UIViewController {
UITextView * textFileView;
}
#property (nonatomic, retain) IBOutlet UITextView * textFileView;
-(void) updateText:(NSString *) newString;
#end
TextFileViewController implementation:
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(done)] autorelease];
textFileView = [[UITextView alloc] init];
}
- (void) updateText:(NSString *)newString {
NSLog(#"new string has value? %#", newString);
[textFileView setText:[NSString stringWithString:newString]];
NSLog(#"print upddated text of textview: %#", textFileView.text);
[[self textFileView] setNeedsDisplay];
}
(void)restClient: loadedFile: will be call after the loadFile:intoPath: is completed in the disSelectRowAtIndexPath method.
In TextFileViewController's updateText method, from NSLog I see that the text property is updated correctly. But the screen does not update accordingly. I've tried setNeedsDisplay but in vain. Did I miss something?
Thanks in advance.

Answer 1

In -[TextFileViewController viewDidLoad] you're creating a UITextView, but its frame is never set, and it's not added to the view hierarchy.
Try changing this:
textFileView = [[UITextView alloc] init];
to this:
textFileView = [[UITextView alloc] initWithFrame:[[self view] bounds]];
[[self view] addSubview:textFileView];

Answer 2

The problem is that textFileView is created in the viewDidLoad method of TextFileViewController. This method has not yet been called by the time you call updateText (this happens before the TextFileViewController is pushed).
You can fix this by forcing the view to load before you call [[self restClient] loadFile:metaData.path intoPath:filePath];.