i searched a while for my problem and tried some hints, but I have still my issue.
Not sure when it occured the first time, but it still occurs.
I get a Black Screen, when i push a UIViewController to my UINavigationController.
I push the new ViewController in a TapGesture handler (code below).
The black screen appears just in iOS 5.1 in the simulator
and works fine in iOS 5.0 and 6.1.
- (void)handleTapGesture:(id)recognizer
{
MyViewController *vc = [[MyViewController alloc] init];
[vc.navigationItem setRightBarButtonItems: nil];
int i = 0;
CGPoint tapLocation = [recognizer locationInView:self.scrollView];
for(UIView *view in self.scrollView.subviews) {
if([view isKindOfClass:[UIImageView class]]) {
// remove quickbars from suberview
[self removeQuickBarFromSuperView:view];
if(CGRectContainsPoint(view.frame, tapLocation)) {
vc.documentDir = self.documentDir;
vc.imageSourcePath = self.imageSourcePath;
vc.content = [content objectAtIndex:i] ;
}
i++;
}
}
[self.navigationController pushViewController:vc animated:YES];
}
I also tested it with
MyViewController *vc = [[MyViewController alloc] initWithNibName:#"MyViewController" bundle:[NSBundle mainBundle]];
(Or bundle: nil)
This as well works fine in 5.0 and 6.1 but cause the app to crash in 5.1.
I appreciate any advice.
kind regards
torben
Related
Recently I updated my xcode project to work with iOS 7, but i faced a big problem. Because my whole application has only one background image (UIImageView added to key window) and all views are transparent, I face a problem when pushing UIViewController, because pushed view controller overlaps previous view (you can see it in the picture here: http://grab.by/qp0k). I can predict that this is because in iOS 7 push transition has been changed, because now it slides half a screen. Maybe anyone knows how to fix this issue?
This is how I set my key windows
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIImageView *background = [[UIImageView alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
background.image = [UIImage imageNamed:#"background.png"];
UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:self.viewController];
self.window.rootViewController = navi;
[self.window makeKeyAndVisible];
Afterwards when user clicks on "start workout" button I push my next view as always:
workoutView *w = [[workoutView alloc]initWithNibName:#"workoutView" bundle:nil];
[self.navigationController pushViewController:w animated:YES];
I did this.
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[self.view setAlpha:0];
}
Do not forget re set alpha when come back.
- (void) viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self.view setAlpha:1];
}
I solved the problem by implementing the new UINavigationControllerDelegate Method animationControllerForOperation.
For example:
- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC
{
PushTransition* transition = [PushTransition new];
[transition setNavigationControllerOperation: operation];
return transition;
}
PushTransition is a class that implements the UIViewControllerAnimatedTransitioning protocol and the two methods transitionDuration and animateTransition from that protocol. Additionally, i have added a property to pass the operation (tells me if it is a push or pop transition).
Just put the animation code for moving the views into the animateTransition as follows:
// the containerView is the superview during the animation process.
UIView *container = transitionContext.containerView;
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *fromView = fromVC.view;
UIView *toView = toVC.view;
CGFloat containerWidth = container.frame.size.width;
// Set the needed frames to animate.
CGRect toInitialFrame = [container frame];
CGRect fromDestinationFrame = fromView.frame;
if ([self navigationControllerOperation] == UINavigationControllerOperationPush)
{
toInitialFrame.origin.x = containerWidth;
toView.frame = toInitialFrame;
fromDestinationFrame.origin.x = -containerWidth;
}
else if ([self navigationControllerOperation] == UINavigationControllerOperationPop)
{
toInitialFrame.origin.x = -containerWidth;
toView.frame = toInitialFrame;
fromDestinationFrame.origin.x = containerWidth;
}
// Create a screenshot of the toView.
UIView *move = [toView snapshotViewAfterScreenUpdates:YES];
move.frame = toView.frame;
[container addSubview:move];
[UIView animateWithDuration:TRANSITION_DURATION delay:0
usingSpringWithDamping:1000 initialSpringVelocity:1
options:0 animations:^{
move.frame = container.frame;
fromView.frame = fromDestinationFrame;
}
completion:^(BOOL finished) {
if (![[container subviews] containsObject:toView])
{
[container addSubview:toView];
}
toView.frame = container.frame;
[fromView removeFromSuperview];
[move removeFromSuperview];
[transitionContext completeTransition: YES];
}];
described it and you can you are done. Additionally you can make any push or pop animation you like.
I fixed it by doing this when initialising the view:
self.view.clipsToBounds = YES;
You might want to look into a new iOS7 feature that allows you to define your own custom UIViewController transitions. Look in the docs for UIViewControllerTransitioningDelegate. Also, here's a link to an article about it: http://www.doubleencore.com/2013/09/ios-7-custom-transitions/
Ah, now I understand the issue. You were right, seems to be caused by the previous UIViewController not being hidden after the transition (because of the new transition effect).
There doesn't seem to be any SDK method to control this behavior. Short of redesigning the app to not requiring the background be static, you'll probably have to roll your own navigation. OSNavigationController is a complete reimplementation of UINavigationController that might help you out. If they haven't updated to the iOS 7 transition, you'll probably be good to go. If they have you can always use an older version.
I had the same problem. Try to load your background image in the init method. For me, it worked (sometimes):
For example:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
self.view.backgroundColor = [UIColor whiteColor];
[self.imageBack setImage:[UIImage imageNamed:#"mayBack.png"]];
}
return self;
}
However, you could see glimpses..
The best solution I found, beside implementing the new iOS7 transition protocol, is to implement a category, and use that category whenever you need it.
You can find the answer here
Setting the image to the background color solved the issue:
self.view.backgroundColor =
[UIColor colorWithPatternImage:[UIImage imageNamed:#"mainback.png"]];
Take a look at the UINavigationController category in that post (it solved me problem) :
https://stackoverflow.com/a/18882232/2826409
Props to #snoersnoer.
Here is the code in Swift 3.
func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let pushTransition = SUPushTransition()
pushTransition.navigationControllerOperation = operation
return pushTransition
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
// the containerView is the superview during the animation process.
let container = transitionContext.containerView
let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from)
let toVC = transitionContext.viewController(forKey:UITransitionContextViewControllerKey.to);
if let from = fromVC,
let fromView = from.view,
let to = toVC,
let toView = to.view {
let containerWidth = container.frame.size.width
// Set the needed frames to animate.
var toInitialFrame = container.frame
var fromDestinationFrame = fromView.frame
if self.navigationControllerOperation == .push {
toInitialFrame.origin.x = containerWidth;
toView.frame = toInitialFrame;
fromDestinationFrame.origin.x = -containerWidth;
}
else if self.navigationControllerOperation == .pop {
toInitialFrame.origin.x = -containerWidth;
toView.frame = toInitialFrame;
fromDestinationFrame.origin.x = containerWidth;
}
// Create a screenshot of the toView.
if let move = toView.snapshotView(afterScreenUpdates: true) {
move.frame = toView.frame
container.addSubview(move)
UIView.animate(withDuration: Constants.MainPage.navControllerDuration, delay: 0.0, usingSpringWithDamping: 1000, initialSpringVelocity: 1, options: .curveEaseInOut, animations: {
move.frame = container.frame;
fromView.frame = fromDestinationFrame;
}, completion: { (finished) in
if finished {
if !container.subviews.contains(toView) {
container.addSubview(toView)
}
toView.frame = container.frame
fromView.removeFromSuperview()
move.removeFromSuperview()
transitionContext.completeTransition(true)
}
})
}
}
}
Cheers.
Im toying around with SwipeGestureRecognizer.
It´s working as I expect, but when I exit the app in the simulator and run it again, the SwipeGestureRecognizer no longer responds. If i run it again after quitting iOS simulator, it works.
This is what I have tried:
#import <UIKit/UIKit.h>
#interface swipeTestUI : UIViewController
#property (strong, nonatomic) IBOutlet UIImageView *imageView;
- (IBAction)mangeSwipeControl:(UIGestureRecognizer*)sender;
#end
Implementation file:
#import "swipeTestUI.h"
#interface swipeTestUI ()
#end
#implementation swipeTestUI
#synthesize imageView;
int listOfImages = 0;
- (IBAction)mangeSwipeControl:(UIGestureRecognizer *)sender {
NSLog(#"swipe ok");
NSArray *images=[[NSArray alloc]initWithObjects:
#"1.png",
#"2.png",
#"3.png",
#"4.png",
#"5.png",
#"5.png",nil];
UISwipeGestureRecognizerDirection direction = [(UISwipeGestureRecognizer *) sender direction];
switch (direction) {
case UISwipeGestureRecognizerDirectionLeft:
listOfImages++;
break;
case UISwipeGestureRecognizerDirectionRight:
listOfImages--;
break;
default:
break;
}
listOfImages = (listOfImages < 0) ? ([images count] -1):listOfImages % [images count];
imageView.image = [UIImage imageNamed:[images objectAtIndex:listOfImages]];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{
return (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
I think this is an iOS simulator issue. I have modified the code a bit, I think its more effective
the header file is the same, the implementation file is as followed.
-(IBAction)manageSwipeControl:(UISwipeGestureRecognizer *)gesture {
NSArray *images=[[NSArray alloc]initWithObjects:
#"1.png",
#"2.png",
#"3.png",
#"4.png",
#"5.png",
#"6.png",nil];
if (gesture.direction == UISwipeGestureRecognizerDirectionLeft)
{
listOfImages++;
}
else if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
{
listOfImages--;
}
listOfImages = (listOfImages < 0) ? ([images count] -1):listOfImages % [images count];
imageView.image = [UIImage imageNamed:[images objectAtIndex:listOfImages]];
//[self.imageView removeGestureRecognizer:sender];
}
Works like a charm. Funny thing. When I quit the application in the iOS simulator, and reopen it. It still works. If I quit and remove it from iOS simulator memory - it does not. If I launch the iOS simulator directly from the OS, no problem what so ever. I can both quit and remove it from memory, and it still works.
Still, a fun way to spend on a rainy weekend. Hope this info is useful to other new developers like myself.
I'm testing an RSS on my iPhone. It uses 0 nib files. I'll try to describe it as best as I can, and will post code if its required, but I bet its a common phenomena with a common solution. The issue is in a tableviewcontroller, and the solution probably needs to be implemented in the CellForRowAtIndexPath method. If I scroll down, preview images stay in their respective spots until the async queue loads the correct image for that cell. So if I have an image for array item 1, and I scroll down to array item 20, the image for array item 1 will still be there until my queue catches up and loads that image. How can I release the images from cells that I am not viewing? Thank you for your time.
Here is my CellForRow...
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[CustomCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier];
}
ArticleItem *object = _objects[indexPath.row];
cell.primaryLabel.text = object.title;
cell.secondaryLabel.text = object.strippedDescription;
cell.primaryLabel.lineBreakMode = NSLineBreakByWordWrapping;
cell.primaryLabel.numberOfLines = 0;
cell.primaryLabel.lineBreakMode = NSLineBreakByWordWrapping;
cell.secondaryLabel.numberOfLines = 0;
//Async dispatch queue for image preview loading...
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
dispatch_async(queue, ^{
UIImage *preview = nil;
if (object.iG = nil)
{
preview = [UIImage imageNamed:#"CellLogo.png"];
}
else
{
preview = [UIImage imageWithData:object.iG];
}
dispatch_sync(dispatch_get_main_queue(), ^{
[[cell myImageView] setImage:preview];
[cell setNeedsLayout];
});
});
return cell;
}
If you gather, I have an ArticleItem class which pulls the image URLS and turns them into data , and I have a CustomCell class which does what its called.
CustomCell.h
#interface CustomCell : UITableViewCell {
UIImageView *myImageView;
}
#property(nonatomic,strong)UIImageView *myImageView;
#end
=====================================================
CustomCell.m
- (id)initWithFrame:(CGRect)frame reuseIdentifier:(NSString *)reuseIdentifier {
if (self = [super initWithFrame:frame reuseIdentifier:reuseIdentifier]) {
// Initialization code
myImageView = [[UIImageView alloc]init];
[self.contentView addSubview:myImageView];
}
return self;
}
-(void)viewDidUnload {
myImageView = nil;
primaryLabel = nil;
secondaryLabel = nil;
}
Implement a subclass of UITableViewcell, make a property for imageview. As soon as it gets away from visibility, it will be released. Describing just the overview as you may yourself need to see the usage upon scrolling.
I have 23 music files (10-20 seconds in length) that I want to play when the user selects them and presses the play button. It works find on my iPad and on the simulators, with or without earphones. But on the iPhone device without earphones, around 80% of the files sound garbled, the volume is low, and some are barely legible. I can plug the earphones in, and they sound fine. As soon as I unplug the earphones, the sounds are garbled again.
Since some of the files always play fine, I converted all the original mp3's that I was using into the AAC format with a sample rate of 44100. But the same files play fine, while most are distorted when playing on the iphone device.
I've tried several settings for AVAudioSession category: playback, playAndRecord, ambient. I've tried storing the files in core data and using initWithData instead of initWithContentsOfURL. Can anyone suggest what else I might try? Or how I might get clues into why I'm having this problem?
Here is my code. There are 3 relevant files. The ViewController that has a button to play a selected music file, an AVPlaybackSoundController that has all the audio logic, and a Singleton that has an array with the filenames.
My ViewController creates an AVPlaybackSoundController through the Nib.
IBOutlet AVPlaybackSoundController *avPlaybackSoundController;
#property (nonatomic, retain) AVPlaybackSoundController *avPlaybackSoundController;
- (IBAction) playButtonPressed:(id)the_sender
{
self.currentRhythmSampleIndex = arc4random() % [[CommonData sharedInstance].rhythmSampleArray count];
[self.avPlaybackSoundController playMusic:self.currentRhythmSampleIndex];
self.playBtn.hidden=YES;
self.pauseBtn.hidden=NO;
}
AVPlaybackSoundController.m
- (void) awakeFromNib
{
[self initAudioSession:AVAudioSessionCategoryPlayback];
[self initMusicPlayer];
}
- (void) initAudioSession:(NSString *const)audioSessionCategory
{
NSError* audio_session_error = nil;
BOOL is_success = YES;
is_success = [[AVAudioSession sharedInstance] setCategory:audioSessionCategory error:&audio_session_error];
if(!is_success || audio_session_error){
NSLog(#"Error setting Audio Session category: %#", [audio_session_error localizedDescription]);
}
[[AVAudioSession sharedInstance] setDelegate:self];
audio_session_error = nil;
is_success = [[AVAudioSession sharedInstance] setActive:YES error:&audio_session_error];
if(!is_success || audio_session_error){
NSLog(#"Error setting Audio Session active: %#", [audio_session_error
localizedDescription]);
}
}
- (void) initMusicPlayer
{
NSError* file_error = nil;
NSURL* file_url = [[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle]
pathForResource:#"musicFile1" ofType:#"m4a"]
isDirectory:NO];
avMusicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:file_url
error:&file_error];
if(!file_url || file_error){
NSLog(#"Error loading music file: %#", [file_error
localizedDescription]);
}
self.avMusicPlayer.delegate = self;
self.avMusicPlayer.numberOfLoops = 0xFF;
[file_url release];
}
-(void) playMusic:(NSUInteger)rhythmSampleIdx
{
CommonData *glob = [CommonData sharedInstance];
if (rhythmSampleIdx > [glob.rhythmSampleArray count])
return; // bug if we hit here
// if we were already playing it, just resume
if ((self.avMusicPlayer) && (rhythmSampleIdx == self.currentRhythmSampleIndex)){
[self.avMusicPlayer play];
}
else{ // re-init player with new rhythm
if (self.avMusicPlayer){
[self.avMusicPlayer stop];
[self.avMusicPlayer setCurrentTime:0.0];
}
NSError* error = nil;
RhythmSample *rhythmSample = [glob.rhythmSampleArray objectAtIndex:rhythmSampleIdx];
NSString* rhythm_filename = [self getRhythmFileName:rhythmSampleIdx];
NSURL* file_url = [[[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle]
pathForResource:rhythm_filename ofType:#"m4a"] isDirectory:NO]autorelease];
self.avMusicPlayer = [[[AVAudioPlayer alloc] initWithContentsOfURL:file_url error:&error]autorelease];
[self.avMusicPlayer prepareToPlay]; // shouldn't be needed since we are playing immediately
if(error){
NSLog(#"Error loading music file: %#", [error localizedDescription]);
}else{
self.avMusicPlayer.delegate = self;
self.avMusicPlayer.numberOfLoops = 0xFF; // repeat infinitely
self.currentRhythmSampleIndex = rhythmSampleIdx;
[self.avMusicPlayer play];
}
}
}
I finally decided to obtain the sound files from a different source. The new sound files play fine. I still have no theory as to why the old sound files would play with earphones, but not without them. I really dislike finding solutions without understanding why they work.
This seems like a really simple idea... I have a button that says "load a picture". When that button is clicked I want to remove the current view, load a new one, open the image picker, get the selected picture, and display it in the view that I just loaded. I have read several documents that say UIImagePicker does not work in viewDidLoad, and found one thread that suggested using awakeFromNib instead but even that does not work... here is code. Please help.
In MenuViewController
-(IBAction)loadPictureButtonPressed
{
UIView *parent = [self.view superview];
if(self.loadPictureViewController.view.superview == nil)
{
if(self.loadPictureViewController == nil)
{
LoadPictureViewController *picController = [[LoadPictureViewController alloc]
initWithNibName:#"LoadPictureView" bundle: nil];
self.loadPictureViewController = picController;
[picController release];
}
}
[parent addSubview:self.loadPictureViewController.view];
[self.view removeFromSuperview];
}
In LoadPictureViewController
-(void)awakeFromNib
{
if([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary])
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentModalViewController:picker animated:YES];
[picker release];
}
else
{
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:#"Error!"
message:#"Device does not support photo library";
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
Again I have tried placing this code in both viewDidLoad and awakeFromNib. Please help
I simply set an NSTimer in viewDidLoad with a timer of 0 to select the method where I load it.
[NSTimer scheduledTimerWithTimeInterval:0 target:self selector:#selector(camera) userInfo:nil repeats:NO];
Instead of NSTimer, you probably want to use the following in -viewDidLoad,
[self performSelector:#selector(camera) withObject:nil afterDelay:0];