Questions tagged [ios4]
The 2010-2011 version of the iPhone/iPad/iPod Touch/Apple TV operating system family, made by Apple.
10,654
questions
414
votes
4
answers
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Design for Facebook authentication in an iOS app that also accesses a secured web service
Goal:
Allow a user to authentication with Facebook into an iOS application which requires access to a protected web service that I'm running.
Assumptions:
There is a native authentication (and ...
- 8,116
318
votes
15
answers
248k
views
How do you use NSAttributedString?
Multiple colours in an NSString or NSMutableStrings are not possible. So I've heard a little about the NSAttributedString which was introduced with the iPad SDK 3.2 (or around 3.2) and is available on ...
- 46.9k
299
votes
10
answers
231k
views
How can we programmatically detect which iOS version is device running on? [duplicate]
I want to check if the user is running the app on iOS less than 5.0 and display a label in the app.
How do I detect which iOS is running on user's device programmatically?
Thanks!
- 9,219
237
votes
9
answers
140k
views
How can I use NSError in my iPhone App?
I am working on catching errors in my app, and I am looking into using NSError. I am slightly confused about how to use it, and how to populate it.
Could someone provide an example on how I populate ...
- 41.9k
194
votes
13
answers
111k
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Handling applicationDidBecomeActive - "How can a view controller respond to the app becoming Active?"
I have the UIApplicationDelegate protocol in my main AppDelegate.m class, with the applicationDidBecomeActive method defined.
I want to call a method when the application returns from the background,...
- 8,735
167
votes
5
answers
84k
views
Trying to understand CMTime and CMTimeMake
1) CMTimeMake(1,10) means duration of 1 second and timescale of 10, or 10 frames per second. This means 1s duration of video with 10 frames?
2)
CMTime lastTime=CMTimeMake(1,10);
CMTime frameTime=...
- 5,321
166
votes
21
answers
70k
views
Missing file warnings showing up after upgrade to Xcode 4
I recently upgraded to Xcode 4 (which is a great upgrade) but now I'm getting some warnings that I did not get before. I have looked through forums and other SO posts but have not come across how to ...
- 16.8k
151
votes
6
answers
67k
views
When to use enumerateObjectsUsingBlock vs. for
Besides the obvious differences:
Use enumerateObjectsUsingBlock when you need both the index and the object
Don't use enumerateObjectsUsingBlock when you need to modify local variables (I was wrong ...
- 19.5k
133
votes
24
answers
130k
views
Unbalanced calls to begin/end appearance transitions for <UITabBarController: 0x197870>
I read SO about another user encountering similar error, but this error is in different case.
I received this message when I added a View Controller initially:
Unbalanced calls to begin/end ...
- 53.8k
128
votes
16
answers
82k
views
iPhone : How to detect the end of slider drag?
How to detect the event when the user has ended the drag of a slider pointer?
- 2,444
126
votes
4
answers
41k
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Why rename synthesized properties in iOS with leading underscores? [duplicate]
Possible Duplicate:
How does an underscore in front of a variable in a cocoa objective-c class work?
When creating a new project in Xcode 4, the boilerplate code adds an underscore character when ...
- 3,751
124
votes
12
answers
99k
views
Disabling user selection in UIWebView
I have an app where I load content to a UIWebView and present this. I cannot disable user interaction completely because I want the user to be able to click links. I just need to disable user ...
- 6,749
119
votes
4
answers
48k
views
No suitable application records were found
I created an App Store archive file. During validation it raises an error with the following message
Please make sure that you have set up a record for this application on iTunes Connect.
- 1,221
115
votes
18
answers
94k
views
How to change Xcode Project name
I have developed my app in Xcode for iPhone, in start I have just named it without secnec now I want to change my app name I have replace my old app name with new one as I have found the name in my ...
- 1,185
113
votes
21
answers
63k
views
Couldn't register with the bootstrap Server
I just changed some code in my program and got this error:
Couldn't register com.yourcompany.XXX with the bootstrap server.
Error: unknown error code.
This generally means that another ...
- 1,174
110
votes
5
answers
42k
views
Developing cross platform mobile application [closed]
More and more mobile platforms are being launched and sdk's are available to developers. There are various mobile platform are available:
Android, iOS, Moblin, Windows mobile 7, RIM, symbian, bada, ...
- 1,712
108
votes
20
answers
59k
views
iPhone: How to switch tabs with an animation?
I'm switching tabs programmatically in a tab bar driven application using UITabBarController.selectedIndex. The problem I'm trying to solve is how to animate the transition between the views. ie. from ...
- 21.3k
94
votes
4
answers
66k
views
How to cancel UIView block-based animation?
I've searched loads of SO stuff and in Apple's references, but still unable to manage my problem.
What I have:
A screen with 2 UIImageViews and 2 UIButtons connected to them
2 kinds of animation:
...
- 4,318
90
votes
6
answers
42k
views
How to print or log the value of CGSize object?
I was trying to log (print) the value of CGSize object like this:
CGSize sizeOfTab = CGSizeMake(self.frame.size.width/tabCount, 49);
NSLog(@"size of tab is %@",sizeOfTab);
Is there anything wrong ...
- 1,904
90
votes
11
answers
132k
views
Convert a string into an int
I'm having trouble converting a string into an integer. I googled it but all I can find is how to convert an int into a string. Does anyone know how to do it the other way around? Thanks.
- 2,063
87
votes
13
answers
28k
views
Custom installed font not displayed correctly in UILabel
I'm trying to use a Helvetica Neue Condensed font which I got from the Adobe Font Collection Pro Package. Unfortunately, it seems to draw incorrectly when I use it within a UILabel.
The line height ...
- 1,817
87
votes
1
answer
33k
views
AVPlayer and MPMoviePlayerController differences [closed]
I am developing an iPhone application that needs to play videos.
So far, I learned that there are at least two API's for achieving this; AVPlayer and MPMoviePlayerController.
What are the main ...
- 10.5k
85
votes
4
answers
74k
views
Using [UIColor colorWithRed:green:blue:alpha:] doesn't work with UITableView seperatorColor?
I'm trying to configure a dark gray seperator color. Why does the following do nothing?
self.tableView.seperatorStyle = UITableViewCellSeperatorStyleSingleLine;
self.tableView.seperatorColor = [...
- 5,071
84
votes
8
answers
125k
views
How to parse the Manifest.mbdb file in an iOS 4.0 iTunes Backup
In iOS 4.0 Apple has redesigned the backup process.
iTunes used to store a list of filenames associated with backup files in the Manifest.plist file, but in iOS 4.0 it has moved this information to ...
- 1,569
83
votes
10
answers
291k
views
What programming languages can one use to develop iPhone, iPod Touch and iPad (iOS) applications?
What programming languages can one use to develop iPhone, iPod Touch and iPad (iOS) applications?
Also are there plans in the future to expand the amount of programming languages that iOS will ...
pylonicon
80
votes
4
answers
79k
views
Install Xcode 3.2.3 w/ iPhone SDK 4, get "Base SDK missing", can't see other SDKs
I created this community wiki to bind together a number of
other Q/A's I've seen here on SO. If you're here, you've probably
installed the final version of Xcode 3.2.3 with iPhone SDK 4 (download
link,...
76
votes
13
answers
99k
views
How to compress/resize image on iOS before uploading to a server?
I'm currently uploading an image to a server using Imgur on iOS with the following code:
NSData* imageData = UIImagePNGRepresentation(image);
NSArray* paths = NSSearchPathForDirectoriesInDomains(...
- 3,381
76
votes
8
answers
51k
views
using dispatch_sync in Grand Central Dispatch
Can anyone explain with really clear use cases what the purpose of dispatch_sync in GCD is for? I can't understand where and why I would have to use this.
Thanks!
- 1,427
76
votes
6
answers
96k
views
Determine if an app exists and launch that app on iOS
Is there a way to check iOS to see if another app has been installed and then launched? If memory serves me this was not possible in early versions but has this been changed?
- 4,189
76
votes
4
answers
71k
views
iOS Private API Documentation [closed]
Is there a web site or project documenting private APIs for the iPhone SDK?
- 25.7k
74
votes
13
answers
89k
views
Get a list of all contacts on iOS
I want to get a list of all contacts of an iPhone.
I checked Address Book reference, I may missed something but I didn't see it provides a method to get a list of contacts.
- 20.2k
74
votes
13
answers
38k
views
Offline iOS web app: loads my manifest, but doesn't work offline
I'm writing a web app to be used offline on iOS. I've created a manifest, am serving it up as text/cache-manifest, and it usually works fine, when running inside Safari.
If I add it as an app to my ...
- 873
70
votes
12
answers
47k
views
NSArray of weak references (__unsafe_unretained) to objects under ARC
I need to store weak references to objects in an NSArray, in order to prevent retain cycles. I'm not sure of the proper syntax to use. Is this the correct way?
Foo* foo1 = [[Foo alloc] init];
Foo* ...
- 28.7k
68
votes
20
answers
54k
views
iPhone UINavigation Issue - nested push animation can result in corrupted navigation bar
I keep getting the following errors:
2011-04-02 14:55:23.350 AppName[42430:207] nested push animation can result in corrupted navigation bar
2011-04-02 14:55:23.352 AppName[42430:207] nested push ...
- 3,381
67
votes
9
answers
66k
views
Center Align text in UITableViewCell problem
I'm kinda new to Objective-C and iPhone development and I've come across a problem when trying to center the text in a table cell. I've searched google but the solutions are for an old SDK bug that ...
- 7,113
66
votes
7
answers
51k
views
applicationWillTerminate when is it called and when not
Hi I have read several questions on SO about applicationWillTerminate getting called and not getting called.
I wanted to summarize what I understood as there are several posts that speak differently.
...
- 4,212
65
votes
7
answers
35k
views
AVCaptureVideoPreviewLayer doesn't fill up whole iPhone 4S Screen
AVCaptureVideoPreviewLayer *avLayer =
[AVCaptureVideoPreviewLayer layerWithSession:session];
avLayer.frame = self.view.frame;
[self.view.layer addSublayer:avLayer];
I use ...
- 1,170
64
votes
8
answers
68k
views
How to get keyboard with Next, Previous and Done Button?
I want to have a keyboard which has a Next,Previous and Done button on top of it.
I have seen that in many apps.
Especially where there are forms to be filled.
I want to achieve something similar ...
- 19.5k
62
votes
21
answers
91k
views
How to add a UIView above the current UITableViewController
I have difficulty adding a subview (UIView) from within the viewDidLoad method of a UITableViewController
This works:
[self.view addSubview:self.progView];
But you can see the table cell lines ...
- 725
60
votes
15
answers
65k
views
How to check if a font is available in version of iOS?
I'm currently working on an app that uses the "ChalkboardSE-Regular" font and my deployment target is 4.0+. This font was not available in 4.1 but it is supported in 4.3. What would be the best way ...
- 833
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votes
10
answers
64k
views
How to get audio volume level, and volume changed notifications on iOS?
I'm writing a very simple application that plays a sound when pressing a button. Since that button does not make a lot of sense when the device is set to silence I want to disable it when the device's ...
- 701
60
votes
1
answer
15k
views
How to make an iPhone app compatible with multiple SDK (firmware) versions
With iOS 4 coming out soon, I have already planned to include an iAd in a future update of an app of mine. I assume that this will make my app unusable for anyone on a firmware lower than 4.0. Is ...
- 2,358
59
votes
3
answers
24k
views
57
votes
6
answers
79k
views
didReceiveRemoteNotification when in background
These kind of question has been asked a number of times but i have some specific situation going on.
When my application is active and I receive a PUSH message i'm successfully able to parse the ...
- 639
57
votes
7
answers
86k
views
Circular Progress Bars in IOS
I want to create a circular progress bar like the following:
How can I do that using Objective-C and Cocoa?
How I started doing it was creating a UIView and editing the drawRect, but I am bit lost. ...
- 3,959
55
votes
3
answers
46k
views
What are block-based animation methods in iPhone OS 4.0?
I am trying to implement a game using the iPhone OS 4.0 (iOS4?) SDK. In the previous versions of the SDK, I've been using the [UIView beginAnimations:context:] and [UIView commitAnimations] to create ...
- 893
55
votes
4
answers
51k
views
Add/Delete UITableViewCell with animation?
I know this might sound like a dumb question, but I have looked every where. How can I do this?
I know how to do this with a swype-to-delete method, but how cam I do it outside that function?
Please ...
- 5,228
55
votes
3
answers
29k
views
AVPlayer vs. AVAudioPlayer
The documentation for AVPlayer states the following:
[The] player works equally well with local and remote media files
However, the documentation for AVAudioPlayer states the following:
Apple ...
- 5,922
55
votes
2
answers
35k
views
How to share keychain data between iOS applications
I am describing a problem for which it took me quite some time to learn the answer.
The "GenericKeychain" example is a good start at providing a wrapper for sharing keychain data between applications ...
- 2,727
54
votes
7
answers
50k
views
How to change the UISwitch default color(blue)
How to change the default color(blue) of a UISwitch?
- 1,904