thoughtbot Build Phase #13

thoughtbot Learn I'm a Professional! Episode #13

MapViewをカスタマイズとかするとき、overlayで面倒な部分があるみたいな話
細かい実装方法の話、いろいろパターンある

delegate, proxy, idにcastとか, intercept
NSProxyがよく分からない
decoratorパターン

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mix conversation
green bubble
blue
iMessage
message still gets so confused
bad

sidebar
looks like static
ten years ago

tweetbot
close

own loading system
3 controller

subclass mkmapview
implement view for overlay

original delegate
response selector

obj c
message forwarding
passing message

only take two
set delegate
created delegate proxy
mk map view real delegate
cast id

lazy method resolution
normal forwarding
invocation expensive

hits proxy
intercepter
class checking
otherwise original delegate
response selector

take advantage
ns proxy is root object

when actually use ns proxy subclass
casting to id

pragma method
skeptical
compiler awesome

ruby
result would be same

interesting pattern
delegate proxy

decorator pattern
admin user class could intercept
admin user object
not subclass
just has user object
polymorphism
override specific things
tell dont ask

init with user
adminuser.init with user

problem type cast
have to treat differently

using type safety
have to use id everywhere
admin user is essentially proxy object

cannot set user value
user protocol
basic user admin user
composed object

main problem
not scalable

tradeoff

image for maptile
overlay
25 delegate methods