Objective-C - 点语法性质

点语法本质

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

int main(int argc, const char * argv[])
{
    Person *p = [Person new];

    // 点语法的本质还是方法调用
    p.age = 10; // [p setAge:10];

    int a = p.age; // [p age];


    p.name = @"Jack";

    NSString *s = p.name;

    NSLog(@"%@", s);

    return 0;
}

@interface Person : NSObject
{
    int _age;
    NSString *_name;
}

- (void)setAge:(int)age;
- (int)age;


- (void)setName:(NSString *)name;
- (NSString *)name;

@end

#import "Person.h"

@implementation Person

- (void)setAge:(int)age
{
    //_age = age;

    NSLog(@"setAge:");

    // 会引发死循环
    //self.age = age; // [self setAge:age];
}

- (int)age
{
    NSLog(@"age");
    return _age;
    // 会引发死循环
    //return self.age;// [self age];
}

- (void)setName:(NSString *)name
{
    _name = name;
}

- (NSString *)name
{
    return _name;
}

@end