Methods such as iOS Initialize and init

During a program run, multiple class objects are created, and only one initialize is called. The creation of several class objects calls Init several times;

Create a Class AA, overriding the Initialize and Init methods, respectively

#import "aa.h"@implementationAA+ (void) initialize{NSLog (@"%s", __func__); }-(instancetype) init{ Self=[Super Init]; if(self) {NSLog (@"%s", __func__); }    returnSelf ;}@end

Create two AA class objects in Viewcontrller

#import " ViewController.h " #import " aa.h " @interface Viewcontroller () @end @implementation Viewcontroller-(void) viewdidload {    [super Viewdidload];     *A1 = [[AA alloc]init];     *A2 = [[AA alloc]init];} @end

The printing results are:

　　　　　　

Conclusion: In the course of running a program, multiple class objects are created, and only one initialize is called. The creation of several class objects calls Init several times;

Creating a class BB inherits from the AA class

#import " aa.h " @interface Bb:aa @end

Create two BB class objects in Viewcontroller

#import " ViewController.h " #import "　　BB.  @interface  viewcontroller ()@end@implementation  Viewcontroller -(void) viewdidload {    [super Viewdidload];     *B1 = [[BB alloc]init];     *B2 = [[BB alloc]init];} @end

Printing results:

　　　　

Conclusion: If it is a subclass, create several instances, initialize and Init will be called several times

Methods such as iOS Initialize and init