Single-case pass-through value

//

In iOS apps, there are often values and variable sharing in different view and applications, and there are several ways to do this:

1.extern mode

2. Single-case mode

3.delegate mode

The singleton pattern, as the name implies, is only one instance, which ensures that a class has only one instance, and instantiates it itself and provides it to the system as a whole. It is often used to do application-level shared resource control. This mode is used very frequently, and through a singleton class, you can implement parameter passing between different view

Build a model, inherit and NSObject, and create a singleton

#import <Foundation/Foundation.h>

@interface shareddata: nsobject

#pragma mark---- the way to create a single case

naming habits: share + class name

+ (instancetype) sharedata;

@property (nonatomic, strong)nsstring *inputnssting;

@end

#import "SharedData.h"

@implementation Shareddata

static shareddata *data = nil;

// Singleton class Use this method to create a singleton object

+ (instancetype) sharedata

{

if (data = = Nil) {

// If no object is created, it is yo high sharedata to Create a new object

Data = [[shareddata alloc] init];

}

// if created, returns the object created directly

return data;

}

@end

How to use

This is the assignment of the button binding event for a certain controller, and it is very simple to know which controller to assign the direct value to.

-(void) Button1action: (UIButton *) sender

{

// and then in the case where you need to use a singleton class import this singleton class

[shareddata sharedata]. Inputnssting = self. TextField. Text;

secondviewcontroller *SECONDVC = [[secondviewcontroller alloc] init];< /c9>

[self. Navigationcontroller pushviewcontroller: SECONDVC animated:YES];

   }

Single-case pass-through value