.h文件@interface myclass:NSObject@property(nonatomic,retain)NSArray*MyArray;@end

.m文件@implementation myclass-(void)viewDidLoad{  [superviewDidLoad];  _MyArray=[[NSArrayalloc]initWithObjects:@"1",nil];  NSLog(@"%lu",(unsignedlong)[self.MyArray retainCount]);//输出1  self.MyArray=[[NSArrayalloc]initWithObjects:@"1",nil];  NSLog(@"%lu",(unsignedlong)[self.MyArray retainCount]);//输出2  我的理解是  self.MyArray=[[NSArrayalloc]initWithObjects:@"1",nil];  相当于  NSArray*a=[[NSArrayalloc]initWithObjects:@"1",nil];  self. MyArray =a;  而self.MyArray会调用myArray的set方法，    -(void)setMyArray:( NSArray *)Array     {        if(Array!= MyArray)       {          [MyArray release];          MyArray =[Array retain];       }    }}