December 2018
Intermediate to advanced
414 pages
10h 19m
English
Content preview from Hands-On Design Patterns with Swift
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Generic classes in Objective-C
Let's craft a class especially for our demonstration purposes. It has the following features:
- It is a generic class, similar to Swift's generic classes
- It exposes generic types (in the form of arrays)
- It exposes a generic type that is bound to the classes' own generics
Consider the following MyGeneric class:
NS_ASSUME_NONNULL_BEGIN@interface MyGeneric<__covariant T> : NSObject@property (nullable, nonatomic, retain) NSArray<T> *genericArray;- (NSArray *)untypedArray;- (NSArray<NSString *> *)stringArray;- (NSArray<__kindof NSString *> *)kindofStringArray;@endNS_ASSUME_NONNULL_END
The previous code is a fully generic Objective-C class and introduces two new keywords:
- __covariant is used to make the MyGeneric ...
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