[Objective-c 基础 - 2.10] description方法

 1 @implementation Person
 2 
 3 - (NSString *)description
 4 {
 5     return [NSString stringWithFormat:@"age = %d, name=%@", self.age, self.name];
 6 }
 7 
 8 @end
 9  
10 int main(int argc, const char * argv[]) {
11     @autoreleasepool {
12         Person *p = [[Person alloc] init];
13         p.age = 33;
14         p.name = @"张三";
15         NSLog(@"%@", p);
16     }
17     return 0;
18 }

 1 + (NSString *)description
 2 {
 3     return @"这是一个Person类";
 4 }
 5  
 6 int main(int argc, const char * argv[]) {
 7     @autoreleasepool {
 8         Class c = [Person class];
 9         NSLog(@"%@", c);
10     }
11     return 0;
12 }