iOS proxy mode

A simple understanding of the iOS proxy mode: When an object cannot get a pointer to another object directly, and you want to do something about that variable, you can use proxy mode.

The agent mainly consists of three parts:

(1) Protocol: Used to specify what the agent can do and what must be done.

(2) Agent: According to the specified protocol, complete the functions that the client needs to implement.

(3) Delegate: According to the specified protocol, specify the agent to complete what function.

Agent use Step 1. Declare a protocol (this is written in the object that needs to be obtained, you can also write a separate class)

@protocol textdelegate

-(void) Deliverfirsttext: (nsstring*) Text1 withdeliversecondtext: (NSString *) Text2;

@end

2. Agent#import #import "LoginProtocol.h"@interface LoginViewController : UIViewController //通过属性来设置代理对象@property (nonatomic, weak) id delegate;@end实现部分：@implementation LoginViewController- (void)loginButtonClick:(UIButton *)button {      // 判断代理对象是否实现这个方法，没有实现会导致崩溃        if([self.delegaterespondsToSelector:@selector(deliverFirsttext:withDeliverSecondtext:)]) {      // 调用代理对象的登录方法，代理对象去实现登录方法            [self.delegate deliverFirsttext:self.text1.textwithDeliverSecondtext:self.text2.text];  }}3 Set the proxy (get to the desired object)@interface ViewController ()  @end@implementation ViewController- (void)viewDidLoad {    [superviewDidLoad];}

-(Ibaction) Buttonaction: (ID) Sender {

Secondviewcontroller *VC =

[[Uistoryboard storyboardwithname:@ "Main" Bundle:nil] instantiateviewcontrollerwithidentifier:@ " Secondviewcontroller "];

To set the agent for the current controller SECONDVC

Vc.delegate = self;

[Self PRESENTVIEWCONTROLLER:VC animated:yes completion:^{

}];

}

-(void) Deliverfirsttext: (NSString *) Text1 withdeliversecondtext: (NSString *) text2{

Self.label1.text = Text1;

Self.label2.text = Text2;

}

Implementation results:

 

iOS proxy mode