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  • Changing the UIBackButtonItem title

    - by Alpinista
    I have a navigationController-based app. I want to change the title of the back button for the root view controller. I have tried the following code in the rootViewController's viewDidLoad method, but no success: self.navigationItem.backBarButtonItem.title = @"Back"; Any ideas?

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  • Weird landscape UITabBarController Application startup

    - by Stefano Verna
    Hi there. My application is quite simple, but I have some problems when it starts. I setted in the Info.plist to be landscaped, but it seems to ignore the order. In fact, when the app is loading the Simulator is landscaped, but then it returns in portrait mode. This is the hierarchy of the views and controllers: MainViewController (extends UITabBarController just to override shouldAutorotateToInterfaceOrientation:) Three extended UITableViewControllers as tabs (also those have the shouldAutorotateToInterfaceOrientation correctly setted up). If I kinda force the orientation of the device to Landscape with: [[UIDevice currentDevice] setOrientation: UIInterfaceOrientationLandscapeRight]; Then for an instant the Simulator flashes in portrait mode, and then it goes landscaped. The problem is that in this way, the auto-rotation animations gets started, which is something I cannot tollerate. I just want a fixed, landscaped application. Any clues? Am I missing something?

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  • Does this popup view violate HIGS?

    - by brettr
    Will using a popup view to present a comment submission form violate the HIGS? I may have one popup with selections that goes to the final popup. Two popups back to back. This is more similar to a modal type of view than an alert or action sheet as described by the HIGS: http://developer.apple.com/iphone/library/documentation/UserExperience/Conceptual/MobileHIG/ModalViews/ModalViews.html#//apple_ref/doc/uid/TP40006556-CH11-SW1 under the section 'Using Modal Views'. Basically the type of view I'm shooting for is a combination of an alert with a custom view. It's sort of a mini view since it will be centered in the middle of the screen but not take up all of the viewing area. I'm fairly sure that is a violation however, but I'm looking for a few opinions on it. I believe what needs to happen is use a modal view, which will cover the entire view.

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  • How to call a view on click of each UITableViewCell programatically?

    - by Cathy
    Hi, I have created a UITableViewcontroller and a UINavigationController in a TableController.m with UITableviewCell set to say @"CellOne" @"CellTwo". Now i also created two other files `ImageView1.m` ImageView2.m where if i click on CellOne i should be able to get the view placed on ImageView1.m, same applied to the ImageView2.m.How should i achieve this programatically without using nib file?

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  • Behavior difference between UIView.subviews and [NSView subviews]

    - by zpasternack
    I have a piece of code in an iPhone app, which removes all subviews from a UIView subclass. It looks like this: NSArray* subViews = self.subviews; for( UIView *aView in subViews ) { [aView removeFromSuperview]; } This works fine. In fact, I never really gave it much thought until I tried nearly the same thing in a Mac OS X app (from an NSView subclass): NSArray* subViews = [self subviews]; for( NSView *aView in subViews ) { [aView removeFromSuperview]; } That totally doesn’t work. Specifically, at runtime, I get this: *** Collection <NSCFArray: 0x1005208a0> was mutated while being enumerated. I ended up doing it like so: NSArray* subViews = [[self subviews] copy]; for( NSView *aView in subViews ) { [aView removeFromSuperview]; } [subViews release]; That's fine. What’s bugging me, though, is why does it work on the iPhone? subviews is a copy property: @property(nonatomic,readonly,copy) NSArray *subviews; My first thought was, maybe @synthesize’d getters return a copy when the copy attribute is specified. The doc is clear on the semantics of copy for setters, but doesn’t appear to say either way for getters (or at least, it’s not apparent to me). And actually, doing a few tests of my own, this clearly does not seem to be the case. Which is good, I think returning a copy would be problematic, for a few reasons. So the question is: how does the above code work on the iPhone? NSView is clearly returning a pointer to the actual array of subviews, and perhaps UIView isn’t. Perhaps it’s simply an implementation detail of UIView, and I shouldn’t get worked up about it. Can anyone offer any insight?

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  • What's the proper way to use sqlite at xCode?

    - by Elliot Chen
    Hi, Experts: Can you please give some suggestions on sqlite using at xcode? Within my application, I use a sqlite DB to store all local data. Two methods can be used to retrieve those data during running time. 1, Load all the data into memory at initialization stage. (More memory used, less DB open/close operation needed) 2, Read corresponding records when necessary, free the occupied memory after using. (Good habit for memory using, but much DB open/close operations needs). I prefer to use method 2, but not sure whether too many DB opening/closing operations could affect app's efficiency. Or do you think I can 'upgrade' method 2 by opening DB when app launches and closing DB when app quits? Thanks for your suggestions very much!

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  • Using the system localizations on iPhone

    - by nevan
    I want to make a back button for a navigation controller with the title "Back" instead of the title of the previous controller. I'm using this code: UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Back", @"Back") style:UIBarButtonItemStyleBordered target:nil action:nil]; self.navigationItem.backBarButtonItem = backButton; I'd like to be able to skip localizing the "Back" string in my app (since I can only localize it in a limited number of languages). If I give my navigation controller no title, the back button will be automatically localized into whatever the language the user has chosen, so the system has translations of "Back" in many languages. Is there a way to access the localizations that are already present in the system and use them myself? These are things like "Back", "Cancel", "Done" and so on, which show up when creating one of the standard system buttons.

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  • Application Design in Interface Builder Challenge

    - by Sheehan Alam
    I want to design an app that launches other sub-apps. Main View will contain 4 buttons. Clicking on each button respectively will launch the other sub-apps. Each sub-app will have a UITabBarController which has its own different views. At any point I want the user to be able to go back to the Main View from any of the sub-apps. I am not sure how to design this in IB.

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  • How do I add an extra separator to the top of a UITableView?

    - by richt
    Hi, I have a view for the iPhone that is basically split in two, with an informational display in the top half, and a UITableView for selecting actions in the bottom half. The problem is that there is no border or separator above the first cell in the UITableView, so the first item in the list looks funny. How can I add an extra separator at the top of the table, to separate it from the display area above it? Here's the code to build the cells - it's pretty straightforward. The overall layout is handled in a xib. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } switch(indexPath.row) { case 0: { cell.textLabel.text = @"Action 1"; break; } case 1: { cell.textLabel.text = @"Action 2"; break; } // etc....... } return cell; }

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  • Do new Apple SDKs patch previous releases?

    - by Francisco Garcia
    A new iPhone will be soon out there along a new iOS release. Sooner or later there will also be a Xcode upgrade with the SDK for iOS 6 Does Apple do any type of bugfix on previous SDKs or are bugfixes just solved on new releases? As an example: Core Data with iCloud still have some issues but it is getting better over time. Let's say I have an app that really depends on that combo. I would require iOS6, however not all users upgrade the handsets. Ideally an app compiled with a newer XCode release could patch some error on previous SDKs if the target is set to an older iOS release. Should I expect that a project compiled with future SDK releases to work better on devices running on older iOS versions? will be some SDKs bugfixes backported? I understand that there are some bugs that cannot be fixed without an iOS update on the client. Also that it is a lot of work (and unlikely) to backport bugfixes. I am just wondering what is the normal release policy of Apple.

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  • NSMutableArray memory management

    - by chicken
    NSMutableArray *a1 = [[NSMutableArray alloc] init]; NSMutableArray *a2 = [NSMutableArray array]; TempObj *obj = [[TempObj alloc] init]; //assume this line is repeated for each obj [a1 addObject:obj]; [a1 addObject:obj2]; [a1 addObject:obj3]; [a1 addObject:obj4]; [obj release]; [obj2 release]; [obj3 release]; [obj4 release]; [a1 release]; Ok so a2 is an autorelease obj so i dont have to call release on it? Also how do you know when you get an autorelease object? And for a1, i dont have to loop through the array and release each object first? What if i called [a1 removeAllObjects]; does that call [[a1 objectAtIndex:#] release]; Am i supposed to release those objects after ive added them to the array?

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  • iPhone keyboard, Done button and resignFirstResponder

    - by nevan
    This is probably a dumb question, but I can't find the answer in the docs. Did the "Done" button on the pop-up keyboard always cause the keyboard to disappear? I see a lot of code around the web like this: - (BOOL)textFieldShouldReturn:(UITextField *)theTextField { [theTextField resignFirstResponder]; return YES; } When I press the "Done" button, the keyboard pops down and the UITextField resigns first responder. I'm presuming that pressing the "Done" button didn't used to cause a UITextField to resignFirstResponder, but that behavior changed at some time. I'm debugging on OS 3.0 - 3.1.3

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  • Secondary thread causes startup delay

    - by JK
    In my didFinishLaunchingWithOptions method I spawn a thread to perform some maintenance on my core data store. However, this increases the startup time by half a second. The startup view is a tableview which draws its content from the same store. If I let the thread sleep for a second, the startup time improves drastically. I would like to understand why the second thread is blocking/delaying the main thread. Is it because both are trying to access the store (The second thread has its own store coordinator and context) or another reason (e.g. dont spawn threads in didFinishLaunching)?

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  • Having a problem with reading a file using NSString initWithContents OfFile

    - by srikanth rongali
    In this program when I debug, it is showing the nil for fileNameString. I could not understand what is the problem. Please help me ? @implementation fromFileRead1 NSString *fileNameString; -(id)init { if( (self = [super init]) ) { fileNameString = [[NSString alloc] initWithContentsOfFile: @"enemyDetails.rtf" encoding:NSUTF8StringEncoding error:nil]; NSArray *lines = [fileNameString componentsSeparatedByString:@"\n"]; for (id *line in lines) { NSLog(@"Line1%@", line ); } } return self; } @end Thank You.

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  • Using fonts that aren't on iPhone

    - by 4thSpace
    I'd like to use some fonts that aren't part of the iPhone OS. I've seen games that use non standard fonts. I can install the fonts, create images for each one in Photoshop and then use those images in the iPhone app. However, I don't think that is a practical way to go. If the color or tint needs to be adjusted (because of background) or size, I'll have to redesign every font I'm using. Is there a better way to do this? I read this http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application and downloaded the open source font label app. However, it crashes most of the time when I try using particular fonts. In regards to the last comment about using UIFont with the fontWithName:size, that certainly doesn't work. Your font variable will be nil. Listing all available fonts reveals why - none of the custom fonts are in the list. I've also read http://stackoverflow.com/questions/566054/how-do-i-include-a-font-with-my-iphone-application, which definitely does not work. Same as last comment in above link.

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  • How to programmatically deactivate the AirPort?

    - by mystify
    I want to make a small utility to programmatically deactivate the AirPort of my mac. I have networking problems which couldnt be resolved by expensive experts. I need to deactivate and reactivate the mac AirPort once every half hour. So a little utility which does that automatically would be great. I think I wouldn't need an UI for this either. Just the most simple possible kind of application to automatically stop and start the AirPort. Maybe even apple automator code?

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  • Copying contents from one NSMutableArray to another

    - by Sheehan Alam
    I have two NSMutableArrays: NSMutableArray* currentMessages NSMutableArray* items I am trying to copy the contents of items into currentMessages as such: [self.currentMessages addObjectsFromArray:self.items]; When I am debugging self.items contains 30 objects. After this operation self.currentMessages contains 0 objects. Why is the copy not working?

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  • list of uids / names of System Preferences > Accounts

    - by neoneye
    How can I obtain an array with uid and names? I could iterate from 0 to 99999 and do a getpwnam(). However most machines have less than 5 accounts, so it's not optimal. I don't know what framework is responsible for this and thus I have no clue what to search for. Is there a more optimal solution that can traverse the accounts?

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  • How to permanently leave a CALayer rotated at its final location?

    - by David
    Hello, I am trying to rotate a CALayer to a specific angle however, once the animation is done, the layer jumps back to its original position. How would I rotate the layer properly so that it stays at its final destination? Here is the code that I am using CABasicAnimation *rotationAnimation =[CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; //Rotate about z-axis [rotationAnimation setFromValue:[NSNumber numberWithFloat:fromDegree]]; [rotationAnimation setToValue:[NSNumber numberWithFloat:toDegree]]; [rotationAnimation setDuration:0.2]; [rotationAnimation setRemovedOnCompletion:YES]; [rotationAnimation setFillMode:kCAFillModeForwards]; Any suggestions? Thank you.

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