ThomasHanning.com (Page 7)

ThomasHanning.com

Sign in Subscribe

Error Handling in Swift 2.0

Error Handling in Swift 2.0

Swift 2.0 has a new way of error handling. It uses a do-try-catch syntax, which is the replacement for NSError . In this post we will discuss how to use this new syntax. Defining an error Before an error can be thrown or catched, it must be defined. You can

Using Custom Fonts

Using Custom Fonts

Out of the box iOS provides you a rich set of fonts. But sometimes there is the need to add another font to your project. For example, this could be one of the Google Fonts, which are open source. In this post we look how you can add a custom

The MVC-Trap

The fundamental software architecture pattern in iOS and Mac OS development is the Model-View-Controller pattern (MVC). The idea of this pattern is, that each of these three layers has a clear and precise role, which leads to more reusable code and less bugs. However, in iOS development there is a

Loading a View from a XIB

Loading a View from a XIB

Generally, there are two ways to layout views: building it in interface builder or by coding. Both ways have their applications, but in many cases the interface builder way is more comfortable. If you layout a view in the interface builder, then it is most times associated with a view

Container ViewController

Container ViewController

Basically, there are two types of view controllers: Content view controllers and container view controllers. Container view controllers are used to manage some set of content view controllers and present them as so-called child view controllers, whereas content view controllers are used to present – surprise – some content. Most of the

Objective-C: Lightweight Generics

Objective-C: Lightweight Generics

Since Xcode 7 there are so-called “Lightweight” Generics in Objective-C. The biggest benefit of this feature is a better interoperability between Objective-C and Swift. The Basics Let’s start with an example. Before the introduction of generics, you declared a mutable array in Objective-C as follows: NSMutableArray *stringArray = [[NSMutableArray alloc]

Singletons in Swift

Singletons in Swift

Some people love it, some people hate it – but in the end everybody uses it: the singleton pattern. It is used if just one instance of an object is desired. For example, that could be a database connection. You can design a singleton in Swift as follows: import Foundation private

Outsource your UITableViewDataSource!

Outsource your UITableViewDataSource!

It is very common that the controller of an UITableView is also its data source. This is the number one reason why view controllers tend to become very massive. Outsourcing the data source to an object on its own is a better solution. Hint: This post has been updated to

One Year of Swift

One Year of Swift

One year ago Apple introduced Swift, which was a very surprising move. What remains after one year? The euphoria about Swift vanished after a short time due to the instability of Xcode 6.0, because there were a lot of crashes and blackouts of the autocompletion. Everyone who worked with

The 10 Best Xcode Shortcuts

The 10 Best Xcode Shortcuts

Keyboard shortcuts can make your life better – or at least your workflow quicker. Here’s a list of the ten best ones: Editor 1. Shift – Command – O: File search 2. Option – Command – ArrowDown / ArrowUp: Switch beetween .h and .m counterparts 3. Shift – Command – F: General search 4. Ctrl – Command – J:

Swift 2.0: defer

Swift 2.0: defer

defer is another new keyword in Swift. With this statement you can declare clean-up code, that is executed just before the current scope ends. For example, this scope can be a function or a loop. Let’s take a look at an example: func aTestFunction(a:Int) { //lots of code.

Swift 2: guard

In Swift 2, there is a new keyword for handling the control-flow of a block of code. It guarantees, that a specific condition holds true for the further code. Otherwise, it ensures that the following code will not be executed. Let us start with a simple example. Imagine you have