I can't find any mention of why forms wouldn't be rendering on iOS 7.1 when they're looking slick on iOS 8. The only glimmer of hope I have is that in one I call [self.tableView reloadData] in viewWillAppear, and that one renders.
I'm using a build of XLForms 2.1.0 from October 2014.
XLForms integration empty tableView may be of use to you if you're having other blank form issues:
I noticed in the XLForm sample project, this pattern within View Controllers:
- (instancetype)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
if (self) {
[self initializeForm];
}
return self;
}
- (instancetype)init
{
self = [super init];
if (self) {
[self initializeForm];
}
return self;
}
- (void)initializeForm
{
// Your form initialization code here
}
I was setting up my form in viewDidLoad, which must have a different lifecycle when compared to XLForms running on iOS 8.
Related
I have some details stored inside an NSDictionary. I'm using a Master-Detail view on iPad and after I added the initWithCoder method, my app crashes on start-up and I don't know how to make it work.
The reason I want to use NSCoder is to store my user's data and be able to show it once he starts the app again. NSUserDefaults isn't feasible because I'm storing UITextFields and UISegmentedControls inside the dictionary for ease of handling data.
- (id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super init]) {
personInfo = [aDecoder decodeObjectForKey:myString];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:personInfo forKey:myString];
}
Can anyone please tell me how to use it properly?
I fixed it by simply saying
self = [super initWithCoder:aDecoder]
instead of just
self = [super init]
I've large project where customer want's to customize tabbar. I've choose BCTabBarController to replace UITabbarController. After few fixes it works fine but after testing I found one bug:
ViewWillAppear, ViewDidAppear, ViewWillDisappear ViewDidDisappear methods not called in selectded view controller and not called into BCTabBarController.
This problem appears after BCTabBarController show modal controller from instance of BCTabBarController class.
I've posted issue to github repo of briancolins, but still have no answer.
Here some code where I calling present modal view controller:
- (void) presentProperlyModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated
{
if ([[self controllerToPresentModalFrom] respondsToSelector:#selector(presentViewController:animated:completion:)]) // For iOS 5
{
[[self controllerToPresentModalFrom] presentViewController:modalViewController animated:animated completion:^(){}];
}
else
{
[[self controllerToPresentModalFrom] presentModalViewController:modalViewController animated:animated];
}
}
-(void) dismissProperlyModalViewControllerAnimated:(BOOL)animated
{
if ([self respondsToSelector:#selector(dismissViewControllerAnimated:completion:)]) {
[self dismissViewControllerAnimated:animated completion:^(){}];
}
else
{
[self dismissModalViewControllerAnimated:YES];
}
}
UPDATE: this issue not reproduced in iOS5 but present at iOS 4.3
As you indicated. iOS 5 forwards the messages, where previous versions do not. Here's how I handle a similar situation:
- (BOOL)needsMessageForwarding:(UIViewController *)vc {
if ( [vc isKindOfClass:[UINavigationController class]] == NO)
return YES;
NSString *ver = [UIDevice currentDevice].systemVersion;
if ( [ver characterAtIndex:0 < '5'] )
return YES;
return NO;
}
- (void) viewWillAppear:(BOOL)animated {
...
if ( [self needsMessageForwarding:modalViewController] )
[modalViewController viewWillAppear:animated];
...
}
// repeat pattern in the other viewWill... viewDid... functions.
In my situation I have a list of view controllers that could be visible, so I manage which view controller is visible and forward the message to it.
i started a single view template in Xcode 4.2(recently upgraded to Xcode 4.2 and ios5)
so now i have only one view controller.
I added a new class to the project which is a subclass of UIViewcontroller.
Now in the main controller class viewdidLoad method
- (void)viewDidLoad
{
// Override point for customization after application launch.
[super viewDidLoad];
[self presentQuizcontroller];
}
-(void) presentQuizcontroller
{
_QuizController = [[[Quiz alloc] initWithNibName:#"Quiz" bundle:nil] autorelease];
_QuizController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:_QuizController animated:YES]; // Do any additional setup after loading the view, typically from a nib.
}
the problem is in my Quiz class
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
the initWithNibName method does get called(i checked by using breakpoint) but it doesn't passes the condition of if(self) . and hence the view don't appears.
Any ideas?
Edit
After the first answer i tried this way too
- (void)viewDidLoad
{
// Override point for customization after application launch.
[super viewDidLoad];
}
-(void) presentQuizcontroller
{
_QuizController = [[[Quiz alloc] initWithNibName:#"Quiz" bundle:nil] autorelease];
_QuizController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:_QuizController animated:YES]; // Do any additional setup after loading the view, typically from a nib.
}
-(void) awakeFromNib
{
[self presentQuizcontroller];
}
same thing Quiz.m initwithnib name method does not passes the condition if(self).
I think you need to use awakefromnib.
Here is the Link for another StackOverflow post if you want to read more.
PresentModalViewController is depreciated, I think you should now use presentViewController instead of it.
Are you sure that "Quiz" is the name of your file? That string should be same as the name of your xib file, namely something like "QuizController" or "QuizViewController"
Make sure the xib file is properly connected to header/implementation files by checking:
Owner of the xib file should be set as the viewController
View on the xib file (the one above all if you have multiple views) should be connected to viewControllers view.
I am having problem with ViewDidLoad Method.I have one .Xib File in my app and 5 viewControlelr.And Each View Controller Contains some initialization and method calls.
Problem is at the startup all the ViewDidLoad method runs.
Is there any way i can do this just when my ViewController will be called and the View is Loaded on the screen?
What is the proper way in this case?
I tried like this code :
-(void)viewDidAppear
{
[ScoreWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://smwebtech.com/Pandit/web_service/getScore.php?u=aa"]]];
}
But my program is not reaching this method.Why?Am i missing something?Please take a look.
Use viewWillAppear method instead. It is only called when the view is going to appear on screen.
Or viewDidAppear which is only called after the view appears on screen.
EDIT:
Both viewWillAppear and viewDidAppear take a BOOL argument each:
- (void)viewWillAppear:(BOOL)animated {
}
- (void)viewDidAppear:(BOOL)animated {
}
EDIT2:
These two delegate methods have their corresponding 'opposite' methods that you can override to release resources you allocate in the former methods:
- (void)viewWillDisappear:(BOOL)animated {
[resource release];
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated {
[resource release];
[super viewDidDisappear:animated];
}
On the iPhone I use UIViewController's viewDidLoad to run code to set up the view.
How can I do that with NSViewController?
I've tried loadView but it doesn't work...
I figured it out within minutes of posting my comment. Adding my finding as an answer because it is an example which is missing in the docs. The below code will give you the viewDidLoad method that you want. Its so easy in a way that i wonder why Apple has not implemented it yet in OS X.
- (void)viewWillLoad {
if([NSViewController instancesRespondToSelector:#selector(viewWillLoad)]) {
[super viewWillLoad];
}
...
}
- (void)viewDidLoad {
if([NSViewController instancesRespondToSelector:#selector(viewWillLoad)]) {
[super viewDidLoad];
}
}
- (void)loadView {
BOOL ownImp = ![NSViewController instancesRespondToSelector:#selector(viewWillLoad)];
if(ownImp) {
[self viewWillLoad];
}
[super loadView];
if(ownImp) {
[self viewDidLoad];
}
}
Original source: http://www.cocoabuilder.com/archive/cocoa/195802-garbage-collection-leaks-and-drains.html
As of OS X 10.10, viewDidLoad is available and supported on NSViewController.
Prior to that, you had to go by this nugget in Snow Leopards' release notes:
Advice for People who Are Looking for -viewWillLoad and -viewDidLoad Methods in NSViewController
Even though NSWindowController has -windowWillLoad and -windowDidLoad methods for you to override the NSViewController class introduced in Mac OS 10.5 does not have corresponding -viewWillLoad and -viewDidLoad methods. You can override -[NSViewController loadView] to customize what happens immediately before or immediately after nib loading done by a view controller.
As of OSX 10.10 (Yosemite), there is now a -viewDidLoad, -viewWillAppear, -viewDidAppear, -viewWillDisappear in NSViewController. See WWDC 2014 - Storyboards and Controllers on OS X session for more info, to find out when each of them gets called, etc.
Here's the relevant bit from the 10.10 header docs about -viewDidLoad:
Called after the view has been loaded. For view controllers created in
code, this is after -loadView. For view controllers unarchived from a
nib, this is after the view is set. Default does nothing.
- (void)viewDidLoad NS_AVAILABLE_MAC(10_10);
why don't you try this:
- (void)awakeFromNib {
//setup code
NSLog(#"hello there");
}
It looks like in 10.10, viewDidLoad is now in NSViewController.
hmm actually I would also do this...
- (void)viewWillLoad {
if (! bool_viewwillload) {
// execute the code
bool_viewwillload = true;
}
}
- (void)viewDidLoad {
if (! bool_viewdidload) {
// execute the code
bool_viewdidload = true;
}
}
and then just make the load view like this
- (void)loadView {
[self viewWillLoad];
[super loadView];
[self viewDidLoad];
}