OC之ARC環境中的循環strong問題

main.m文件:atom

#import <Foundation/Foundation.h>
#import "Person.h"
#import "Dog.h"

int main()
{
    Person *p = [[Person alloc] init];
   Dog *d = [[Dog alloc] init];
   p.dog = d;
   d.person = p;

   return 0;
}

Dog.m文件:

#import "Dog.h"

@implementation Dog
- (void)dealloc
{
   NSLog(@"Dog--dealloc");
}
@end

 Person.m文件:

#import "Person.h"

@implementation Person

- (void)dealloc
{
   NSLog(@"Person--dealloc");
}

@end
Dog.h文件:

#import <Foundation/Foundation.h>

@class Person;

@interface Dog : NSObject

@property (nonatomic,strong) Person *person;

@end

 Person.h文件:

#import <Foundation/Foundation.h>

@class Dog;

@interface Person : NSObject

@property (nonatomic, strong) Dog *dog;

@end

對於上述main.m文件中紅色部分「人養一條狗,狗有一個主人」,仔根據兩個.h文件中部分,編譯運行時會出現「人strong狗,狗strong人」的狀況,致使p和d佔用的內存沒法被回收,即上圖黃色部分不打印。解決辦法爲:spa

一端用strong,另外一端用weakcode

好比能夠將Dog.h文件中strong改爲weak,就能夠解決循環strong 問題。內存




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