iosswift - Tumblr blog

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Open Settings app from code

New in iOS8 you can now launch the Settings app and show your apps settings easily with the following line of code… UIApplication.sharedApplication().openURL(NSURL(string: UIApplicationOpenSettingsURLString)!)

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Great article from Mattt Thompson on Swift's new comment syntax in Xcode 6 ß4. Ive been waiting for this! :-)

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Adding a blur effect in iOS8

iOS8 includes the new UIVisualEffectView which can be used to add dynamic blurs to any area of the screen you like. Here's an example of just making a ViewController's whole view blurry...

override func viewDidLoad() { super.viewDidLoad() // blur let blur = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Light)) blur.frame = view.frame view.addSubview(blur) }

Note: If you want other views to sit on top of the blurred view, add them to its contentView property

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Swift programming language - Apple Keynote

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Describes the key structures, classes, protocols, and free functions available in the Swift Standard Library.

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Describes various aspects of Swift's compatibility with the Objective-C language and Cocoa/Cocoa Touch frameworks.

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The definitive guide to Swift, Apple’s new programming language for building iOS and OS X apps.

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I know you know this link already but its a useful shortcut

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A simpler RegEx expression syntax

I was kinda disappointed that regular expressions aren't built in to the core Swift syntax, like in other languages like Ruby. So I came up with this String extension that lets me do a regex straight from pattern string...

import Foundation extension String { func firstMatchIn(string: NSString!, atRangeIndex: Int!) -> String { var error : NSError? let re = NSRegularExpression(pattern: self, options: .CaseInsensitive, error: &error) let match = re.firstMatchInString(string, options: .WithoutAnchoringBounds, range: NSMakeRange(0, string.length)) return string.substringWithRange(match.rangeAtIndex(atRangeIndex)) } } var result = "(worl)".firstMatchIn("hello world", atRangeIndex: 1) // -> "worl"

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NSFileManager documents & caches extension

Here's a handy little NSFileManager extension that gives you easy access to the documents and caches directories for your app...

import Foundation extension NSFileManager { class func documentsDir() -> String { var paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as [String] return paths[0] } class func cachesDir() -> String { var paths = NSSearchPathForDirectoriesInDomains(.CachesDirectory, .UserDomainMask, true) as [String] return paths[0] } }

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UIColor and CSS colors - the easy way

We see CSS colors like #2980B9 every day, but how do you use this in a UIColor? It's easy, just break it apart into its Red (29), Green (80) and Blue (B9) components and create your UIColor like this...

import Cocoa extension UIColor { class func belizeHole() -> UIColor! { return UIColor(red: 0x29/0xff, green: 0x80/0xff, blue: 0xb9/0xff, alpha: 1) } }

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Using FMDB (Bridging Headers)

FMDB is a pretty awesome wrapper around sqlite and a great alternative to CoreData. But its written in Objective-C, so how do you access it from Swift? Add the FMDB files into your project (I usually put them in External/fmdb) and then add a bridging header like this...

// FMDB #import "FMDatabase.h" #import "FMDatabaseAdditions.h" #import "FMDatabasePool.h" #import "FMDatabaseQueue.h" #import "FMResultSet.h"

The FMDB classes should now be accessible from your Swift files. Here is an example of loading and executing a db.sql file to create my DB...

class DB: NSObject { var queue:FMDatabaseQueue? = nil // queue to perform all DB ops on func createDB() { let path = "\(NSFileManager.documentsDir())/rss.db" queue = FMDatabaseQueue(path: path) // create tables queue!.inDatabase({(db: FMDatabase!) in let path = NSBundle.mainBundle().pathForResource("db", ofType: "sql") let sql = String.stringWithContentsOfFile(path, encoding: NSUTF8StringEncoding, error: nil) db.executeStatements(sql) }) } }

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Breaking ViewControllers apart with extensions

We're all used to having large ViewController classes that implement multiple delegates for their child views. In Swift you can break each delegate into its own block of code using extensions like this...

import UIKit class MyController: UIViewController { // class specific funcs here } extension MyController : UITableViewDelegate { // table funcs here } extension MyController : UISearchBarDelegate { // search func here }