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Objective-C

A collection of 6 posts

How to check whether a mobile device is muted or not on iPhone/iPad

How to check whether a mobile device is muted or not on iPhone/iPad

On iOS devices, there are mainly two types of sounds: * Ringtones and reminders: Including system sounds such as phone calls, text messages, notifications (also including key tones, lock sounds, which can be set in the settings to enable or disable), they are controlled by the physical mute switch key, that

Constants in Objective-C

Constants in Objective-C

Recently I was working on a legacy project written in Objective-C, which reminded me of the early days when working on Objective-C projects. In the code I saw few things like the following which defines a constant: #define car_price 300 #define creates a macro which simply do the replacement

Key-Value Coding and Key-Value Observing in Objective-C

What is KVO/KVC KVC(Key-Value Coding) is a coding style which coming from Functional Programming, KVO(Key-Vlaue Observing) is the technology that underlies Cocoa Bindings, and it provides a way for objects to get notified when the properties of other objects are changed. How does it work To illustrate

Singleton in Objective-C/Swift

What is behind the Singleton? Singleton: Instantiation of a class to ONLY one object Features of Singleton: 1. One class only can have only one instance; 2. It must can create this instance automatically; 3. This instance must be provided to other objects. Benefits of Singleton: All objects can only

Method Chaining in Objective-C and how to make your own

When I was using the Masonry, I was shocked by author’s thoughts on bring Functional Programming to objective-c, which present a clean and concise way on developing. Normally a chain method looks like: Method Chaining is simple but powerful, which has three key points, everyone can create his/her

viewWillAppear, viewDidAppear, viewDidLoad, viewWillDisappear and viewDidDisappear?

Introduction Before this, let me ask you what is the running order of viewWillAppear, viewDidAppear, viewDidLoad, viewWillDisappear and viewDidDisappear? If you know the answer, please close this webpage and continue your game. :) So a simple piece code is written to verify this: Example code: // // ViewController.m // TestBlock // // Created by Ben