Lazy loading and assigning nil operations [iOS development tutorial]

<title>Lazy loading for use and assignment of nil operations</title>

1: Data, empty operation:

self=nil;

2: Archive from new local fetch data

self=nil;

# #id = The use of nil

Block when the parameter is called in the method body as follows

Safe block version

<#block#> ? <#block#>() : nil;

or advanced version: safe block Plus binding code version

if(<#Block#>) {<#Block#>();<#Code:behavior that is performed at the same time after the request succeeds,like:in theUILabelin the classification method,after the request to the string,The string corresponds to theLabelthe Style #>}Else{}

Lazy loading and assigning nil operations [iOS development tutorial]