I'm trying to move a uiLabel down a drop if it's an iPhone 5 (4" display). But it's not working when the code is in viewDidLoad. If I call the code from clicking a uiButton, it works. Here's the code:
-(void) viewDidLoad {
if(CGSizeEqualToSize([[UIScreen mainScreen] preferredMode].size,CGSizeMake(640, 1136))) {
CGRect frame = [self.timeOnCurrentQuestion frame];
frame.origin.y += 40; // change the location
[self.timeOnCurrentQuestion setFrame:frame];
nslog(#"This DOES get logged");
}
}
Jonah, have you tried your code in viewWillAppear method? Possibly, it'll sort-out your issue.
Maybe that are something you need to beware of.
- (void)viewDidLoad
It is a method that when the controller juz created its view.
for example:
maybe in your init method, you call something like:
[self.view setBackground:[UIColor redColor]];
self.timeOnCurrentQuestion = [[UIView alloc] initWithFrame:kFrame];
In this case the work flow will be like this:
[self.view setBackground:[UIColor redColor]];
[self viewDidload];
self.timeOnCurrentQuestion = [[UIView alloc] initWithFrame:kFrame];
Th reason for this work flow is because the self.view is called, then its view is needed before the normal view cycle, so , in this case, self.timeOnCurrentQuestion is still nil in the viewDidload method.
I don't know if my practice is the best or not.
I always init the subView in the controller's init method.
and do the [self.view addSubview:_subview] (//or everything method call that require the self.view) in [self viewDidload];
viewDidAppear worked for me. The life cycle seems to be
LoadView()
viewDidLoad()
viewWillAppear()
viewDidAppear()
Related
I tried to add TapforTap Ads to my iPhone app, the ad appear but I show this message in console "Unbalanced calls to begin/end appearance transitions for ." after any navigation of pages and then the app crash, the below code for calling TapForTap Ads. How I can solve this problem?
- (void)viewDidLoad
{
[super viewDidLoad];
CGFloat y = self.view.frame.size.height - 50.0;
TapForTapAdView *adView = [[TapForTapAdView alloc] initWithFrame: CGRectMake(0, y, 320, 50) delegate: self];
[self.view addSubview: adView];
[TapForTapAppWall prepare];
[TapForTapAppWall showWithRootViewController: self]; // or possibly self.navigationController
}
Thanks A lot
I don't know it for sure. But try this:
- (void) ShowTapAd {
CGFloat y = self.view.frame.size.height - 50.0;
TapForTapAdView *adView = [[TapForTapAdView alloc] initWithFrame: CGRectMake(0, y, 320, 50) delegate: self];
[self.view addSubview: adView];
[TapForTapAppWall prepare];
[TapForTapAppWall showWithRootViewController: self]; // or possibly self.navigationController
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self performSelectorOnMainThread:#selector(showTapAd) withObject:nil waitUntilDone:NO];
}
The run time warning that you got appears when you hussle with two (or more) segue, Navigation Controller push or present modally types of processes. Meaning when you initiate one before the former was totally finished.
I am surprised that those things can happen when you call something within viewDidLoad. So you may find out that the root cause is not located within the code sniplet that you have shown. But if it is then this could do the trick.
What it does:
It just makes sure that your setup of the ad view is performed after viewDidLoad is properly finished. As viewDidLoad runs on the main tread as all UI related stuff does (or should do), the current appearance transistion should be finised by then.
Hope, this helps. Again, it is just a guess.
I have the following code where after a bool is true I want to add a drawing to my rect. here is the code I have but for some reason it is either not setting the bool or calling the setNeedsDisplay. Am I referencing to the other class properly? thanks
//in AppController.m
-(IBAction)colorToggle:(id)sender
{
if ([colorFilter state] == NSOnState)
{
CutoutView *theView = [[CutoutView alloc] init];
[theView setFilterEnabled:YES];
}
}
//in cutoutView.m
- (void)drawRect:(NSRect)dirtyRect
{
[[[NSColor blackColor]colorWithAlphaComponent:0.9]set];
NSRectFill(dirtyRect);
//this is what i want to be drawn when my bool is true and update the drawRect
if (filterEnabled == YES) {
NSRectFillUsingOperation(NSMakeRect(100, 100, 300, 300), NSCompositeClear);
[self update];
}
}
-(void)update
{
[self setNeedsDisplay:YES];
}
OK, you know how not every UILabel is the same? Like, you can remove one UILabel from a view without all the others disappearing too? Well, your CutoutView is the same way. When you write CutoutView *theView = [[CutoutView alloc] init]; there, that creates a new CutoutView that isn't displayed anywhere. You need to talk to your existing CutoutView (probably by hooking up an outlet, but there are any number of perfectly valid designs that will accomplish this goal).
You are forgetting to call the drawRect: method, it should looks like this:
CutoutView *theView = [[CutoutView alloc] init];
[theView setFilterEnabled:YES];
[theView setNeedsDisplay];
From the docs:
When the actual content of your view changes, it is your
responsibility to notify the system that your view needs to be
redrawn. You do this by calling your view’s setNeedsDisplay or
setNeedsDisplayInRect: method of the view.
I'm adding a button in the middle of my initWithNibName:bundle:, when i add the button view to self.view, the view goes to start to initialize before it add's the button. So the Code in viewDidLoad gets fires before the initWithNibName:bundle: is finished. There is code below the addSubview that is relied on in the viewDidLoad and causes it to crash/not work since the init code has not run.
I've had the same experience when I added the button code to the viewDidLoad method. There is a UITableView in the .xib and the table gets inited before the rest of the viewDidLoad gets run and caused the tableView to get bad Data.
What is the best practice for adding a view to a view when you are initing and loading the view? just put all the addSubViews before the Return?
Thanks!
Here is my initWithNibName:bundle:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
self = [super initWithNibName:nibNameOrNil bundle:nil];
[self setIoUIDebug:(IoUIDebugSelectorNames)];
if (IoUIDebug & IoUIDebugSelectorNames) {
NSLog(#"%# - %#", [self description], NSStringFromSelector(_cmd) );
}
CGRect frame = CGRectMake(20, 521, 500, 37);
saveButton = [UIButton newButtonWithTitle:NSLocalizedStringFromTable(#"Save Animation Label",#"ScreenEditor",#"Save Animation Label")
target:self
selector:#selector(saveButtonPressedAction:)
frame:frame
image:[UIImage imageNamed:#"BlueButtonSmall.png"]
imagePressed:[UIImage imageNamed:#"BlueButtonSmallPressed.png"]
darkTextColor:NO];
[self.view addSubview:saveButton]; // <- Right here I'll hit breakpoints in other parts of viewDidLoad and cellForRowAtIndexPath, before the lined below get executed.
[saveButton setEnabled: NO];
[saveButton setUserInteractionEnabled: NO];
newAnimation = nil;
selectedSysCDAnimation = nil;
selectedIoCDTag = nil;
animationSaved = NO;
return self;
}
You should add the subviews inside viewDidLoad this will mean that the views are added when the main view is loaded into memory. I would reserve your initWithNibName:bundle: call for custom initialization and not interacting with the UI as this what viewDidLoad is designed for.
In regards to your tableView, you should put a call to load the tables datasource inside of viewDidLoad. Once the datasource is loaded, you can simply call reloadData on the tableview to load the data into the tableview.
For Example:
- (void)viewDidLoad
{
[super viewDidLoad];
[self.view addSubview:saveButton];
[self loadDataSource];
}
- (void)loadDataSource {
// load datasource here
[self.tableView reloadData];
}
Any access to the view property of the view controller will lazily initialize the view. This will trigger a call to viewDidLoad which will execute before the access to the view property returns in initWithNibName:. You should add the sub view in viewDidLoad or using interface builder.
I'm trying to create a NSImageView programmatically as a subview of another NSImageView when awakeFromNib is called.
My code is as follows (Fader is defined in MyImageView.h):
#implementation MyImageView
- (void)awakeFromNib {
Fader = [NSImageView initWithFrame: [self frame]];
}
I get the warning message "NSImageView may not respong to +initWithFrame". When I build, the app simply frizzes without showing anything, and I have to "force quit".
What am I doing wrong?
You’ve forgotten to send +alloc in order to allocate the object. Change that line to:
Fader = [[NSImageView alloc] initWithFrame: [self frame]];
I understand modal views cover the entire screen. But I really want a view that covers only half the screen just like the keyboard. So, please tell me why this doesn't work
MyController *controller = [[MyController alloc] initWithNibName:#"MyView" bundle:nil];
CGRect frame = CGRectMake(0,44,768,264);
[controller view].frame = frame;
contoller.delegate = self;
[[self view] addSubView:[controller view]];
[controller release];
I am trying to add a sub view to my current view and make it appear where the keyboard appears.
It throws a BAD ACCESS exception
In my code (above), I was using a custom UIViewController with it's own view [set to UIView on IB]. I couldn't get it to work by setting frame for the view controller's view.
So I added a custom UIView without a Nib file with all the controls (buttons, textfields) added on initWithFrame.
MyCustomView = [[MyCustomView] alloc] initWithFrame:frame delegate:self];
[self.view addSubView:MyCustomView];
Thanks for your comment, Jacob.