Questions tagged [ios]
iOS is the mobile operating system running on the Apple iPhone, iPod touch, and iPad. Use this tag [ios] for questions related to programming on the iOS platform. Use the related tags [objective-c] and [swift] for issues specific to those programming languages.
688,443
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Vertically align text to top within a UILabel
I have a UILabel with space for two lines of text. Sometimes, when the text is too short, this text is displayed in the vertical center of the label.
How do I vertically align the text to always be ...
- 28.9k
1948
votes
28
answers
536k
views
What's the difference between the atomic and nonatomic attributes?
What do atomic and nonatomic mean in property declarations?
@property(nonatomic, retain) UITextField *userName;
@property(atomic, retain) UITextField *userName;
@property(retain) UITextField *...
- 185k
1792
votes
98
answers
654k
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How can I make a UITextField move up when the keyboard is present - on starting to edit?
With the iOS SDK:
I have a UIView with UITextFields that bring up a keyboard. I need it to be able to:
Allow scrolling of the contents of the UIScrollView to see the other text fields once the ...
1614
votes
29
answers
710k
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Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
How do you use Auto Layout within UITableViewCells in a table view to let each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling ...
- 30.4k
1606
votes
30
answers
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Transport security has blocked a cleartext HTTP
What setting do I need to put in my info.plist to enable HTTP mode as per the following error message?
Transport security has blocked a cleartext HTTP (http://) resource
load since it is insecure....
- 27.2k
1500
votes
44
answers
525k
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Passing data between view controllers
I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following:
I have a view that acts as a data entry form and I want to give the user the option to select multiple ...
- 34.6k
1408
votes
39
answers
515k
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How can I check for an active Internet connection on iOS or macOS?
I would like to check to see if I have an Internet connection on iOS using the Cocoa Touch libraries or on macOS using the Cocoa libraries.
I came up with a way to do this using an NSURL. The way I ...
- 47.1k
1324
votes
27
answers
486k
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How do I sort an NSMutableArray with custom objects in it?
What I want to do seems pretty simple, but I can't find any answers on the web. I have an NSMutableArray of objects, and let's say they are 'Person' objects. I want to sort the NSMutableArray by ...
- 45.1k
1323
votes
82
answers
1.0m
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Xcode - How to fix 'NSUnknownKeyException', Reason: "… this class is not key value coding-compliant for the key X" error?
I'm trying to link a UILabel with an IBOutlet created in my class.
My application is crashing with the following error"
***
Terminating app due to uncaught exception
'NSUnknownKeyException', ...
1302
votes
19
answers
192k
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performSelector may cause a leak because its selector is unknown
I'm getting the following warning by the ARC compiler:
"performSelector may cause a leak because its selector is unknown".
Here's what I'm doing:
[_controller performSelector:NSSelectorFromString(@"...
- 24.7k
1281
votes
21
answers
588k
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How do I check if a string contains another string in Objective-C?
How can I check if a string (NSString) contains another smaller string?
I was hoping for something like:
NSString *string = @"hello bla bla";
NSLog(@"%d",[string containsSubstring:@"hello"]);
But ...
- 55.2k
1277
votes
42
answers
543k
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How can I disable the UITableView selection?
When you tap a row in a UITableView, the row is highlighted and selected. Is it possible to disable this so tapping a row does nothing?
- 39.1k
1269
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43
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1.1m
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How can I develop for iPhone using a Windows development machine?
Is there any way to tinker with the iPhone SDK on a Windows machine? Are there plans for an iPhone SDK version for Windows?
The only other way I can think of doing this is to run a Mac VM image on a ...
1160
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37
answers
579k
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How can I change the name of an iOS app in Xcode?
I began an iPhone project the other day with a silly development code name, and now I want to change the name of the project since it's nearly finished. How can I do this?
- 69.5k
1088
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62
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How to change Status Bar text color in iOS
My application has a dark background, but in iOS 7 the status bar became transparent. So I can't see anything there, only the green battery indicator in the corner. How can I change the status bar ...
