Beginning iOS Programming: Building and Deploying iOS by Nick Harris

By Nick Harris

iOS 7 replaced everything—get as much as speed!

iOS 7 is a massive shift within the feel and appear of apps—the first significant sea swap because the iPhone was once first brought. For apps to combination in with the hot UI, each one wishes a whole remodel. Beginning iOS Programming: construction and Deploying iOS Applications starts off on the beginning—including an creation to aim C—and grants the talents you must get your apps up and working. writer Nick Harris has vast adventure constructing for iOS and gives a fantastic history for instructing the development blocks of app development.

  • Learn Objective-C and the way it differs from different programming languages
  • Turn your app proposal into an actionable plan
  • Build each one function with assistance from standalone chapters
  • Assemble your undertaking right into a real-world iOS app

Throughout the booklet, you'll test with dozens of recipes from real-life situations, developing an app as you research. The book's web site good points obtain pattern apps to persist with besides the guideline, and pattern code to demonstrate ideas.

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Sample text

A boss needs a way to send messages to their worker the same as the worker needs a way to send messages to their boss. This means both need to have a reference to each other. If the Company object gets deallocated, its references to both Employee objects go with it. This should result in the Employee objects also being deallocated. But if the references between the boss Employee object and the Company worker Employee object are also strong references, then they will not be deallocated. If the references are weak, as illustrated in Figure 2-7, with dashed lines, then losing the strong reference to each Employee object from the Company object will mean there are no longer any strong references pointing to them so they will be properly dealEmployee Employee located.

The system has to spend a lot more time finding available memory to use, which slows down every process. Memory management is controlling what objects need to remain in memory and which ones are no longer in use, so their memory can be reused. Memory leaks are a classic problem in computer programming. A memory leak, in the most basic of definitions, is when memory is allocated but never deallocated. The opposite of a leak is when memory is deallocated before it is done being used. This is what has been historically referred to as a dangling pointer.

The concept of strong and weak with properties is similar. An object that does not have a strong reference to it will be deallocated. By declaring an object property as strong, it will not be deallocated as long as your object points to it. This implies that your object owns the other object. An object property that is declared weak remains in memory as long as some other object has a strong pointer to it. Company Employee Employee FIGURE 2-6 Weak properties are used to avoid strong reference cycles.

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