Effective Objective-C 2.0 52 Specific Ways to Improve Your by Matt Galloway

By Matt Galloway

Powerful Objective-C 2.0 may also help you harness all of Objective-C’s expressive energy to write down OS X or iOS code that works fantastically good in creation environments. utilizing the concise, scenario-driven variety pioneered in Scott Meyers’ best-selling potent C++, Matt Galloway brings jointly fifty two Objective-C top practices, advice, shortcuts, and lifelike code examples which are on hand nowhere else.

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Read/Write Both a getter and a setter are available. If the property is synthesized, the compiler will generate both methods. readonly Only a getter is available, and the compiler will generate it only if the property is synthesized. You may want to use this if you expose a property only for read externally but redeclare it as read/write internally in the class-continuation category. See Item 27 for more information. readwrite Memory-Management Semantics Properties encapsulate data, and that data needs to have concrete ownership semantics.

For this reason, you should always use NS_OPTIONS if you are going to be ORing together the enumeration values. If not, you should use NS_ENUM. An enumeration can be used in many scenarios. Options and states have been shown previously; however, many other scenarios exist. Status codes for errors are a good candidate as well. Instead of using preprocessor defines or constants, enumerations provide a means for grouping together logically similar status codes into one enumeration. Another good candidate is styles.

This method is usually used for Boolean properties where you want the getter to be prefixed with is. For example, on the UISwitch class, the property for whether the switch is on or off is defined like so: @property (nonatomic, getter=isOn) BOOL on; Specifies the name of the setter. This method is not commonly used. You can use these attributes to get fine-grained control over the synthesized accessors. However, you should note that if you implement your own accessors, you should make them adhere to the specified attributes yourself.

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