Tag: ios

59 votes
6 answers
719 views
What are Unwind segues for and how do you use them?

iOS 6 and Xcode 4.5 has a new feature referred to as "Unwind Segue": Unwind segues can allow transitioning

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Leonardo
0 1 0 9
asked 07 September, 2021
67 votes
17 answers
1.4K views
How to tell if UIViewController's view is visible

I have a tab bar application, with many views. Is there a way to know if a particular UIViewController is curr

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Chelsea
0 1 0 9
asked 07 September, 2021
60 votes
9 answers
1.6K views
What does the NS prefix mean?

Many classes in Cocoa/Cocoa Touch have the NS prefix. What does it mean?

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Serina
0 1 0 9
asked 07 September, 2021
62 votes
6 answers
495 views
Send and receive messages through NSNotificationCenter in Objective-C?

I am attempting to send and receive messages through NSNotificationCenter in Objective-C. However, I haven&apo

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Tana
0 1 0 9
asked 07 September, 2021
63 votes
30 answers
1.5K views
Xcode 6 Bug: Unknown class in Interface Builder file

I upgraded to Xcode 6 beta 4 and now my App continuously crashes with the message Unknown class X in Inter

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Alba
0 1 0 9
asked 07 September, 2021
59 votes
30 answers
1.1K views
Attempt to present UIViewController on UIViewController whose view is not in the window hierarchy

Just started using Xcode 4.5 and I got this error in the console: Warning: Attempt to present < finishV

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Percy
0 1 0 9
asked 07 September, 2021
57 votes
30 answers
414 views
Why is there extra padding at the top of my UITableView with style UITableViewStyleGrouped in iOS7

Starting in iOS7, there is additional space at the top of my UITableView's which have a style UITableView

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Venice
0 1 0 9
asked 07 September, 2021
55 votes
30 answers
1K views
How do I test if a string is empty in Objective-C?

How do I test if an NSString is empty in Objective-C?

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Deedee
0 1 0 9
asked 07 September, 2021
56 votes
7 answers
665 views
Version vs build in Xcode

I have an app that I developed with Xcode 3 and recently started editing with Xcode 4. In the target summary I

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Santiago
0 1 0 9
asked 07 September, 2021
63 votes
30 answers
372 views
This action could not be completed. Try Again (-22421)

I am trying to upload an Apple TV App to the App Store for testing purposes, but I got the issue: This Action

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Rudy
0 1 0 9
asked 07 September, 2021
70 votes
15 answers
1.7K views
Xcode 6: Keyboard does not show up in simulator

The keyboard does not show up when I run the simulator and click in the UITextView. How do I re-enable the key

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Omar
0 1 0 9
asked 07 September, 2021
57 votes
14 answers
1.8K views
Hide strange unwanted Xcode logs

When using the Xcode 8+ and creating a new blank project, the following logs appear when running the applicati

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Solomon
0 1 0 9
asked 07 September, 2021
54 votes
25 answers
2.4K views
How to link to apps on the app store

I am creating a free version of my iPhone game. I want to have a button inside the free version that takes peo

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Suzan
0 1 0 9
asked 07 September, 2021
53 votes
30 answers
736 views
Placeholder in UITextView

My application uses an UITextView. Now I want the UITextView to have a placeholder similar to the one you can

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Corey
0 1 0 9
asked 07 September, 2021
62 votes
30 answers
2.3K views
Eliminate extra separators below UITableView

When I set up a table view with 4 rows, there are still extra separators lines (or extra blank cells) below th

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Lawanda
0 1 0 9
asked 07 September, 2021
57 votes
19 answers
2.3K views
How do I create delegates in Objective-C?

I know how delegates work, and I know how I can use them. But how do I create them?

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Forrest
0 1 0 9
asked 07 September, 2021
53 votes
20 answers
725 views
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?

Is there a way to call a block with a primitive parameter after a delay, like using performSelector:withObject

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Xavier
0 1 0 9
asked 07 September, 2021
50 votes
30 answers
2.5K views
Loaded nib but the &apos;view&apos; outlet was not set

I added a new nib file to my project, and tried to load it. However, when I click on the toolbar icon that is

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Lashawna
0 1 0 9
asked 07 September, 2021
48 votes
30 answers
1.5K views
Can I embed a custom font in an iPhone application?

I would like to have an app include a custom font for rendering text, load it, and then use it with standard U

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Venice
0 1 0 9
asked 07 September, 2021
53 votes
14 answers
1.2K views
Xcode process launch failed: Security

I have been developing an app for 1 or 2 weeks now and just yesterday I have updated my iPhone 5S to the iOS 8

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Omar
0 1 0 9
asked 07 September, 2021