IOS Learning Notes forward reverse exercise--Lan Yi Education

Forward-passing value Lan Yi education

Jump from Viewcontroller (Class A) to Secondviewcontroller (Class B) during a jump page

A Secondviewcontroller page created in Viewcontrolller

So, from the Viewcontroller to the second, the forward value is transmitted.

If it's text, then it's actually a string, so we're going to start with SecondViewController.h.

Build an attribute nsstring*accept. h is open and visible

So Viewcontrolller.

[Email protected] "111";

Secondviewcontroller *s2=[[secondviewcontroller Alloc]init];

S2.ns=self.l111.text;

[Self presentviewcontroller:s2 animated:yes completion:nil];

So in the second page can output [email protected] "111";

Reverse pass-through value

The first step

First, in Class B. h, add #import "Class A Viewcontroller"

Then create a Class A Viewcontroller property

@property (nonatomic,weak) Viewcontroller *l1;

Step Two

Creating a position setting for Class B Objects (B1) in Class A

b1.delegate=self;

Step Three

The method and method types used to establish a reverse value (call) in Class A are different depending on the purpose

-(void) fanxiangaction;

Fourth Step

In class B, the reverse value (the location of the call) is required to enable

[Self.delegat fanxiangaction];

Fifth Step

Receives the value of the called B in a method called by Class B in Class A, or implements the required method

-(void) {

}

IOS Learning Notes forward reverse exercise--Lan Yi Education