Questions tagged [swift]
Swift is a general-purpose programming language developed by Apple Inc first released in 2014 for its platforms and Linux. Swift is open-source. Use the tag only for questions about language features or requiring code in Swift. Use the tags [ios], [ipados], [macos], [watch-os], [tvos], [swiftui], [cocoa-touch], and [cocoa] for (language-agnostic) questions about the platforms or frameworks.
swift
334,832
questions
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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
1138
votes
17
answers
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views
How do I call Objective-C code from Swift?
In Swift, how does one call Objective-C code?
Apple mentioned that they could co-exist in one application, but does this mean that one could technically re-use old classes made in Objective-C whilst ...
- 26.7k
1088
votes
62
answers
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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 ...
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votes
20
answers
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#pragma mark in Swift?
In Objective C, I can use #pragma mark to mark sections of my code in the symbol navigator. Since this is a C preprocessor command, it's not available in Swift. Is there a stand-in for this in Swift, ...
- 39k
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9
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Swift Beta performance: sorting arrays
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The ...
- 12.3k
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votes
20
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How to iterate a loop with index and element in Swift
Is there a function that I can use to iterate over an array and have both index and element, like Python's enumerate?
for index, element in enumerate(list):
...
- 13.1k
884
votes
19
answers
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#ifdef replacement in the Swift language
In C/C++/Objective C you can define a macro using compiler preprocessors.
Moreover, you can include/exclude some parts of code using compiler preprocessors.
#ifdef DEBUG
// Debug-only code
#endif
...
- 21.2k
842
votes
41
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Get the length of a String
How do you get the length of a String? For example, I have a variable defined like:
var test1: String = "Scott"
However, I can't seem to find a length method on the string.
- 9,482
833
votes
41
answers
806k
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Split a String into an array in Swift?
Say I have a string here:
var fullName: String = "First Last"
I want to split the string based on whitespace and assign the values to their respective variables
var fullNameArr = // ...
- 12.4k
748
votes
19
answers
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How do I see which version of Swift I'm using?
I just created a new Swift project within Xcode. I am wondering which version of Swift it's using.
How can I see, in Xcode or the terminal, what version of Swift I am using inside my project?
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24
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@selector() in Swift?
I'm trying to create an NSTimer in Swift but I'm having some trouble.
NSTimer(timeInterval: 1, target: self, selector: test(), userInfo: nil, repeats: true)
test() is a function in the same class.
...
- 39k
686
votes
43
answers
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iOS 8 UITableView separator inset 0 not working
I have an app where the UITableView's separator inset is set to custom values - Right 0, Left 0. This works perfectly in iOS 7.x, however in iOS 8.0 I see that the separator inset is set to the ...
- 10.2k
673
votes
23
answers
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Convert Int to String in Swift
I'm trying to work out how to cast an Int into a String in Swift.
I figure out a workaround, using NSNumber but I'd love to figure out how to do it all in Swift.
let x : Int = 45
let xNSNumber = x ...
- 8,039
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34
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iOS app with framework crashed on device, dyld: Library not loaded, Xcode 6 Beta
This crash has been a blocking issue I used the following steps to reproduce the issue:
Create a Cocoa Touch Framework project
Add a swift file and a class Dog
Build a framework for device
Create a ...
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659
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27
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How do I check if a string contains another string in Swift?
In Objective-C the code to check for a substring in an NSString is:
NSString *string = @"hello Swift";
NSRange textRange =[string rangeOfString:@"Swift"];
if(textRange.location != NSNotFound)
{
...
- 31k