What's new in Swift 2.0

Transcript

1. SWIFT 2.0
   WHAT’S NEW WITH
   

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2. FIRST
   WHAT SWIFT 1.2 BROUGHT
   ▸ Speed enhancements, optimization in the runtime.
   Original issue with swift vs. obj-c
   ▸ if-let pyramids of doom deprecated
   ▸ Upcasts and Downcasts with as adds some optional safety
   ▸ Native Set added to the collection types
   ▸ let constants don’t have to be set at declaration
   ▸ Swift first-class citizenry enforced even more
   

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3. SWIFT 1.2
   BETTER OPTIONAL BINDING
   

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4. SWIFT 1.2
   UPCASTS AND DOWNCASTS
   

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5. SWIFT 1.2
   LET CONSTANTS
   

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6. SWIFT 1.2
   NULLABILITY ANNOTATIONS FOR BETTER OBJ-C TO SWIFT
   ▸ nonnull, nullable, null_unspecified
   ▸ originally anything in the Cocoa API returned to swift an
   unwrapped optional (AnyObject!)
   ▸ potentially bad if nothing was there, no way to know!
   crashed at runtime!
   ▸ much easier to handle things like UIKit with methods that
   will return optionals or guaranteed instances.
   

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7. SWIFT 1.2
   NULLABILITY ANNOTATIONS CONTINUED…
   

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8. SWIFT 2.0
   SWIFT 2.0 IS HERE
   ▸ Protocol extensions, default method implementations
   inside a protocol
   ▸ Error Handling, we now have throw, try, and catch !
   ▸ guard statement for better readability and early logic exit
   ▸ API availability statement
   ▸ Automatically synthesized headers
   

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9. SWIFT 2.0
   PROTOCOL EXTENSIONS
   

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10. SWIFT 2.0
    PROTOCOL EXTENSIONS CONTINUED…
    

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11. SWIFT 2.0
    YES YOU CAN OVERRIDE THE DEFAULT
    

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12. SWIFT 2.0
    ERROR HANDLING
    

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13. SWIFT 2.0
    GUARD STATEMENT
    

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14. SWIFT 2.0
    API AVAILABILITY
    

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15. SWIFT 2.0
    JUMP TO INTERFACE
    

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16. SWIFT 2.0
    CONVERT YOUR OBJ-C APPS NOW
    

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