The application which runs smoothly on 4.0.1 when was tried on run on 4.2.1 produced distorted screen i.e., screen somewhat moved to left by 20%. Phones on which iOS 4.0.1 and 4.2.1 are installed are 2 different phones. What could be the problem?
We observed that wherever we have added as subview this problem is occurring.
Thanks,
Satish
From your description, I think it is either that you are not setting the correct view.autoresizingMask properly or there is a subtle change in how views are being laid out.
Try setting the frame of the view that moved explicitly and see what happens.
[view setFrame:CGRectMake(0, 0, 320, 460)]
Some related piece of code and/or screenshots would definitely help. Also, is it a UIKit application or a Cocos2D game?
EDIT: Since you can't provide code (or a stripped-down example version) I'll just post some code that I've been using.
Usually when I add subviews to "fill" a parent view, I had do the following:
UIView *parent = nil; // find parent view
UIView *child = nil; // child view to add to parent
[parent addSubview:child];
CGRect frame = [parent frame];
frame.origin.x = 0;
frame.origin.y = 0;
[child setFrame:frame];
If you have done that and it still does not work I believe the problem might lies somewhere else (i.e. have you overridden layoutSubviews by any chance? or was the phone jailbroken?)
I highly doubt it'll be a UIKit bug though but it is totally possible.
Related
When running my iOS app on a 3.5 inch iPhone Simulator, self.view.frame.size.height is reporting 548px. What is the right way to fix this?
I assume you see this behavior in viewDidLoad, right?
The screen dimensions are not final while in viewDidLoad. You should only rely on the view's frame in viewWillLayoutSubviews method.
it's because you're calling this from viewDidLoad right?
I bet calling the NSLog in this function instead comes back with the correct height;
-(void)viewDidAppear:(BOOL)animated {
NSLog(#"%f", self.view.frame.size.height);
}
You should really be using self.view.bounds instead of self.view.frame
for more information about why and how view this SO:
"Incorrect" frame / window size after re-orientation in iPhone
I'm sure I'm missing something basic here. I'm trying out the CALayers 'hello world' code from:
http://www.raywenderlich.com/2502/introduction-to-calayers-tutorial
Doing the very first example. New single view project in xcode 4.2. No change to the nib/storyboard. Import QuartzCore. Add the following code to ViewDidLoad in the ViewController.m:
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.layer.backgroundColor = [UIColor blueColor].CGColor;
self.view.layer.cornerRadius = 30.0;
self.view.layer.frame = CGRectMake(20, 20, 20, 20);
}
I run this (ipad 2 or ipad simulator) and get a full screen blue rectangle with rounded corners. What I hoped to get was a 20x20 blue rectangle offset by 20/20.
I'm clearly getting control over the views layer (as shown by the color and rounded corners). However, adjusting the frame seems to have no impact. I've NSLog'ed the frame before/after setting it, and it has changed. Is the frame of the root layer locked to the uiview frame?
I don't have a strong reason to change the views layers frame, I'm just trying to reason through what is going on. Hopefully this is an easy question...
Thanks!
Paul
Actually, the previous answer (you can't set uiview.layer.frame as it always fills the uiview) is close, but not quite complete. After reading the answer, I registered for the original site and to comment that the tutorial had issues. In doing so, I found that there were already comments that I hadn't seen in my first pass that addressed this. Using those, I started doing some testing.
The bottom line, if you move the self.view.layer.frame setting code from viewDidLoad to viewWillAppear, it works fine. That means that you can change the frame of the root layer of a view. However, if you do it in viewDidLoad it will be undone later.
However, the previous answer is still pretty close. I NSLog'ed the frame of the root layer and the frame of the view. Changing the root layer frame changes the view frame. So, the answer that the view.layer.frame always fills the view.frame is correct. However, setting the layer frame resets the view frame to match. (I'm guessing that uiview.frame property simply returns uiview.layer.frame...)
So, at some point in time between 2010 and today, something in the environment changed. Specifically, after viewDidLoad and before viewWillAppear the uiview/layer frame appears to be reset to the nib specified value. This overrides any changes in viewDidLoad. Changes made in viewWillAppear appear to stick.
Robin's answer got me on the right track, but I wanted to spell out the full answer.
The tutorial is wrong. Setting the frame of the view's main layer has no effect. The main layer is 'special' and will always fill the view's bounds. What you need to do is create a sublayer of the main layer like this:
- (void)viewDidLoad
{
[super viewDidLoad];
CALayer *newLayer = [[CALayer alloc] init];
newLayer.backgroundColor = [UIColor orangeColor].CGColor;
newLayer.cornerRadius = 20.0;
newLayer.frame = CGRectMake(100.0f, 100.0f, 200.0f, 200.0f);
[self.view.layer addSublayer:newLayer];
[newLayer release]; // Assuming you're not using ARC
}
Also, in your code a layer with width 20pt and height 20pt is too small to have rounded corners of 30pt anyway.
I am using Cocoanetic's implementation of EGOTableViewPullRefresh.
It's a cinch to implement. Love it:
http://www.cocoanetics.com/2009/12/how-to-make-a-pull-to-reload-tableview-just-like-tweetie-2/
The only problem I'm having is with rotation. When the view rotates, the refresh header doesn't adjust for landscape mode. It sits left aligned, 320.0f units wide.
I have tried everything I can think of to adjust this properly. I set it as a property in PullToRefreshTableViewController and tried to set the frame the same way it is done in init. This failed. I tried to do it in this same controller in viewWillAppear. Failed.
Beyond this, I tried about 6 other methods not worth detailing. The problem seems to be that I'm using the wrong bounds, even though I'm making them relative to the view.
Nothing I do replicates what is seemingly easy in viewDidLoad:
refreshHeaderView = [[EGORefreshTableHeaderView alloc] initWithFrame:
CGRectMake(0.0f, 0.0f - self.view.bounds.size.height,
320.0f, self.view.bounds.size.height)];
It seems all I really need to do is increase the width. I tried something along the lines of this:
refreshHeaderView.frame = CGRectMake(refreshHeaderView.frame.origin.x, refreshHeaderView.frame.origin.y, 480.0f, refreshHeaderView.frame.size.height);
No luck.
The link at the top has the full, unmodified source code for what I'm using.
What about just setting the UIView.autoresizingMask to UIViewAutoresizingFlexibleWidth?
I'm not really sure why this isn't working, hopefully you can help me find the missing piece. I have a UIScrollView with paging enabled. I'm using it for side-scrolling through a tutorial. I have a button that when tapped should scroll the user back to the beginning of the tutorial. I originally tried using the scroll view's frame as the rect to scroll to because that CGRect should represent the first page. I've tried a couple of different CGRects to no avail though.
- (IBAction) touchedButtonReturnToBeginning:(id)sender {
// I've tried several CGRect's, none of which cause the UIScrollView to move.
// CGRect beginning = self.containerScrollView.frame
// CGRect beginning = self.containerScrollView.bounds;
CGRect beginning = CGRectMake(0, 44, 1, 1);
[self.containerScrollView scrollRectToVisible:beginning animated:YES];
}
I have verified that self.containerScrollView is hooked up in my xib as well as the touchedButtonReturnToBeginning action is connected to my button. I've used my debugger to step through this method, so I have verified that it is getting called. All of the variables are appropriately set, but when I call scrollRectToVisible the scroll view just doesn't do anything.
Any ideas?
I don't know why that wouldn't work, but have you tried [self.containerScrollView setContentOffset:CGPointZero animated:YES]?
To make scrollRectToVisible works check your self.containerScrollView.contentSize. It should be big enough :)
Once again I've searched for about 45 minutes for an answer to this question and I thought I might have found the answer but then the situation I was reading wasn't exactly like the one I'm running into.
when I add my view it seems that it's not completely covering the window I was able to get rid of the status bar at the top but there is a section of space at the bottom that the view is not covering
alt text http://img177.imageshack.us/img177/8844/picture1zjv.png
as you can see from the screenshot there is an orange bar...it's orange because I know what it actually is under there (it's the viewController's view but everything I try I can't seem to get the added view to cover the screen.
this is the only code that's run
(void)viewDidLoad {
[super viewDidLoad];
[self.view addSubview:mainMenu];
}
Any help would be appreciated.
There are a few things that might be going wrong:
Your frame might be too short. In viewDidLoad: you can add a debug statement to check its height:
NSLog(#"Height is %f", self.view.frame.size.height);
It looks like you want that value to be 480, the full height of the screen.
Your origin might be too high. Similarly check your y offset:
NSLog(#"y origin is %f", self.view.frame.origin.y);
It looks like you want that value to be 0.
The origin of your superview might be too high. Assuming you this view only has one superview, this code will help check the absolute coordinates of your view's origin:
CGPoint absoluteOrigin = [self.view convertPoint:self.view.frame.origin
toView:self.view.superview];
NSLog(#"y origin in superview is %f", absoluteOrigin.y);
You can just tag on a few extra .superview's to find out the coordinates in terms of the prior views.
By the way, instead of just using 480 as a magic number in your code, you might want to do something like this to get the full height:
CGRect appFrame = [[UIScreen mainScreen] applicationFrame];
CGFloat screenHeight = appFrame.size.height;
The applicationFrame property takes into account whether or not the status bar is displayed.
You should post your code, but in general, you can make a UIView fill the screen as follows:
UIView *foo = [[UIView alloc] initWithFrame:CGRectMake(0,0,320,480)];
And you can set the frame later:
foo.frame = CGRectMake(0,0,320,480);
To fill the screen, you should use a 320 x 480 Rectangle, at origin (0,0). That's what that CGRectMake function above creates.
I've had this problem before, I fixed it by just moving the view down 20 pixels...
When you use interface builder it has that nifty little "simulate status bar" or "simulate toolbar" feature but I think its kind of finnicky.
Both Andrew and Tylers answers should work though, no shame in doing things programmatically :). If you are creating the stuff in interface builder, just do Andrew's second line though, don't need to reinitialize.
Ok, well I figured it out and now I feel kind of stupid...I went back to IB and realized that the height of each view was set at 460 and not 480...you guys did give me a bunch of good information and I appreciate it all. I wish I could mark them all as answers.
Thank you again,
BWC