IOS value-in-pass mode

1. Initialize the value of the pass (Shun pass)

Custom initialization methods in the UI, usually when one interface pushes another interface, so if you want to use a custom initialization method, at least in this method to create the object, so this method is not suitable for callbacks.

<1> Custom initialization method, which will need to pass the content as parameters, if you need to pass multiple, set multiple parameters

<2> calling custom initialization methods in the right place

2. Attribute value (pass-through)

<1> Defining public properties

<2> need an object that you can pass a value on

<3> attribute Assignment

3. Single-pass values (both shun and inverse)

The advantage of a singleton is that once created, the rest of the time is used at the same time, so a lot of times the user's information is stored in a singleton, so there is no need to make multiple values, only need to create a single case again on the line

4.AppDelegate Transmit Value

<1> a property of life in Appdelegate

<2> by Appdelegate *app = [[Uiapplocation sharedapplication] delegate]; Save property

<3> by Appdelegate *app = [[Uiapplocation sharedapplication] delegate]; Using properties

5. Notification value (pass-through and reverse-pass)

<1> Create a notification sender

<2> Create a notification recipient

<3> Destruction Notification

6. Proxy value (cis-and inverse-pass) (A&B)

B.h: Establishing an agreement to set proxy properties

B.M: Let agents execute protocols and methods when they need agents to do things. (Note: First judgment to prevent crashes)

a.m.: Set up the agent, abide by the protocol, implement the Proxy method

7.block transmit value (pass and reverse) (Declaration and invocation in B are implemented in a)

<1> names The block and writes the parameters that need to be passed in the parameter list as a formal parameter

<2> Set block Properties (note: With week)

<3> set a method to hold the current block

<4> call in the right place

<5> block calls where the object is created

8.NSUserDefault or File value: (Pass and reverse)

[[Nsuserdefault Standarduserdefault] Objectforkey:];

The inverted pass needs to be in Viewwillappear and viewdidappear.

IOS value-in-pass mode