OC高效率52之實現description方法

#import "ViewController.h"
#import "EOCPerson.h"
#import "EOCLocation.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor whiteColor];
    EOCPerson *person = [[EOCPerson alloc]initWithFirstName:@"Zou" secondName:@"Jie"];
    NSLog(@"%@",person);
    EOCLocation *location = [[EOCLocation alloc]initWithTitle:@"HaiNan" latitude:15.00f longitude:10.00f];
    NSLog(@"%@",location);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#import <Foundation/Foundation.h>
/**
 *  自定義對象要想輸出更爲有用的信息，只須要覆寫description方法並將描述此對象的字符串返回便可
 */
@interface EOCPerson : NSObject
@property (nonatomic , copy , readonly) NSString *firstName;
@property (nonatomic , copy , readonly) NSString *secondName;
-(id)initWithFirstName:(NSString *)firstName
            secondName:(NSString *)secondName;
@end
#import "EOCPerson.h"

@implementation EOCPerson
-(id)initWithFirstName:(NSString *)firstName secondName:(NSString *)secondName
{
    if ((self = [super init])){
        _firstName = [firstName copy];
        _secondName = [secondName copy];
    }
    return self;
}

-(NSString *)description{
    return [NSString stringWithFormat:@"%@ %@",
            _firstName,_secondName];

}
//調試時 po命令的打印
-(NSString *)debugDescription
{
    
    return [NSString stringWithFormat:@"<%@: %p,\"%@ %@\">",[self class],self,_firstName,_secondName];
}
@end

#import <Foundation/Foundation.h>

@interface EOCLocation : NSObject
@property (nonatomic , copy , readonly) NSString *title;
@property (nonatomic , assign , readonly) float latitude;
@property (nonatomic , assign , readonly) float longitude;
-(id)initWithTitle:(NSString *)title
          latitude:(float) latitude
         longitude:(float) longitude;
@end
#import "EOCLocation.h"

@implementation EOCLocation
-(id)initWithTitle:(NSString *)title latitude:(float)latitude longitude:(float)longitude
{
    if ((self = [super init])){
        _title = [title copy];
        _latitude = latitude;
        _longitude = longitude;
    }
    return self;
}
-(NSString *)description
{
    return [NSString stringWithFormat:@"<%@: %p, %@>",[self class],self,@{@"title":_title,@"latitude":@(_latitude),@"longitude":@(_longitude)}];

}

@end