OBJECTIVE-C Foundation Framework Practice--nsmutablearray (i) __nsmutablearray

Similarly, the array also has a variable form, that is, Nsmutablearray, and now we're going to implement these methods:

(1) New Person.h file, implemented as follows:

#import <Cocoa/Cocoa.h>

@interface person:nsobject

@property (nonatomic,strong) nsstring *personname;

-(Instancetype) Initwithpersonname: (NSString *) name;

@end

(2) New PERSON.M file, implemented as follows:

#import "Person.h"

@implementation person

//rewrite init method;
-(Instancetype) Initwithpersonname: (NSString *) name{
  
  self = [super init];
  if (self) {
    _personname = name;
  }
  
  return self;
}

@end

(3) implemented as follows in MAIN.M:

#import <Foundation/Foundation.h> #import "Person.h" int main (int argc, const char * argv[]) {@autoreleasepool
    {//add element; *person1 = [[Person alloc] initwithpersonname:@ ' Jack '];
    Person *person2 = [[Person alloc] initwithpersonname:@ ' Mary '];
    
    Person *person3 = [[Person alloc] initwithpersonname:@ "Robert"];
    
    Nsmutablearray *arr = [[Nsmutablearray alloc] init];
    [Arr Addobject:person1];
    [Arr Addobject:person2];
    
    
    [Arr Addobject:person3];
    For (person *p in arr) {NSLog (@ "%@", p.personname);
    Person *person4 = [[Person alloc] initwithpersonname:@ ' me '];
    
    [Arr Addobject:person4];
    For (person *p in arr) {NSLog (@ "%@", p.personname); //////////////////////////////////////////////////////////////////using another initialization method; Nsmutablearray *arr1 = [
    [Nsmutablearray alloc] init];
    Nsarray *ARR3 = [[Nsarray alloc] initwithobjects:person1,person2,person3, nil]; AttentionThe following method assigns each object in the array as an element to a mutable array; [arr1 ADDOBJECTSFROMARRAY:ARR3];
    Note that the following method assigns the entire array as an object to the variable array;//[arr1 ADDOBJECT:ARR3];
    
    
    NSLog (@ "%@", arr1);
    
    Delete elements;//delete all elements within the array;//[arr1 removeallobjects];
    
    
    Delete the last element;//[arr1 removelastobject];
    The position of the exchange element; [arr1 exchangeobjectatindex:0 withobjectatindex:1];
    
    
  NSLog (@ "%@", arr1);
return 0; }

The output results are as follows:

。

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