Method-Chaining-in-Objective-C

A project with two ways showing how to create chain methods in objective-c

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This project illustrates how to create chaining methods in Objective-C. When I used the Masonry, I was shocked by author's thoughts on bring Functional Programming to objective-c, which present clean and concise code to all developers. Method Chaining is simple but powerful, which has three key points, everyone can create his/her own chaining method after knowing this:

1. Methods can be called consecutively.
2. Each of the metod return the same type
3. Special in Objective-C, as which only allows to use sqaure brackets to call methods. parathesis is used for block.

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Code

Method 1:

Thanks Kangzubin's tutorial and idea, method 1 is common method that many developer can come up with.

CalculateChain *calc = [[CalculateChain alloc] init];
calc.add(10).minus(5).multiply(100).divide(2);
NSLog(@"results: %f", calc.result);
    

Method 2:

Method 1 is similar to the one used in Masonry. However, an instance must be created every time you call those chaining methods. So why not use categroy (If you don't know how, go have a check at Swift Extension and Objective-C category).

With categroy in hand, all the NSNumber type value can call those chaining methods straight away.

NSNumber *num = @0.0;
NSLog(@"results: %@", num.add(10).minus(5).multiply(100).divide(2));

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To Do:

• Method Chaining in Swift

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Reference

• Masonry
• Swift Extension and Objective-C category
• [https://kangzubin.com/objective-c-chainable-syntax/index.html]https://kangzubin.com/objective-c-chainable-syntax/index.html