objective-c - OC中间没有使用synthesize关键字，为什么还能访问呢？

Question

#import <Foundation/Foundation.h>
/**
 
 默认的范围是protected
 
 **/
@interface Animal :NSObject
{
    
    
    int _age;
    NSString * name;
}

@property int age;
@end

@implementation Animal{
    
    
    
    
}


@end
int main(int argc, const char * argv[]) {
    
    
    Animal*  animal=[Animal  new];
    animal.age=10;
    [animal setAge:5];
    NSLog(@"age is %d",animal.age);
    
    return 0;
  
}

不是说synthesize关键字是在实现中自动生成set和get方法吗？但是我这里是没有使用
synthesize关键字，怎么还是能调用呢？

Answer 1

After using ARC, @synthesize和int _age; you can save everything and it will be added automatically. The code becomes elegant from now on!

Answer 2

This was not allowed in previous iOS versions. If I remember correctly, you can omit the synthesize keyword after iOS 7. As long as the property is set, the system will automatically generate the default get and set methods.

Answer 3

Because of @property, the getter setter method is automatically generated.

Answer 4

Contrary to @isteven's answer, the role of ARC is to provide automatic memory management, not to ignore @synthesize. The reason why @synthesize can be ignored is that every time a global variable is declared in the past, it needs to be resynchronized in it. Since this step has become a repetitive step, iOS development later omitted this step for the sake of humanization, and actually loaded this part automatically.

Answer 5

The compiler handles it automatically, no need to write sythesize