标签：turn 调用 扩展方法 扩展 within 个数 为什么 round eval
思路：
YGInteger.h
#import <Foundation/Foundation.h> @interface YGInteger : NSObject @property(nonatomic,assign)NSInteger integer; @end
YGInteger.m 中写一个description方法，和 扩展中，将数字转换成字符串的方法
#import "YGInteger.h"
#import "YGInteger_YGChangeValue.h"
@implementation YGInteger
- (NSString *)description
{
return [NSString stringWithFormat:@"%ld",self.integer];
}
- (NSString *)changeValue
{
return [NSString stringWithFormat:@"%@",self];
}
@end
YGInteger+YGInit.h 这是Integer的Init分类
#import "YGInteger.h" #import "YGInteger.h" @interface YGInteger (YGInit) - (instancetype)initWithInteger:(NSInteger)integer; + (instancetype)integerWithInteger:(NSInteger)integer; @end
YGInteger+YGInit.m 实现一下标配方法
#import "YGInteger+YGInit.h"
@implementation YGInteger (YGInit)
- (instancetype)initWithInteger:(NSInteger)integer
{
if (self = [super init]) {
self.integer = integer;
}
return self;
}
+ (instancetype)integerWithInteger:(NSInteger)integer
{
__autoreleasing YGInteger *i = [[YGInteger alloc]initWithInteger:integer];
return i;
}
@end
YGInteger+YGMath.h Integer的计算分类，里面有加、减、乘、除 四个方法声明。
#import "YGInteger.h" @interface YGInteger (YGMath) - (YGInteger *)add:(YGInteger *)i; - (YGInteger *)minus:(YGInteger *)i; - (YGInteger *)multiply:(YGInteger *)i; - (YGInteger *)divide:(YGInteger *)i; @end
YGInteger+YGMath.m 利用对象调用，充分体现面向对象编程。
#import "YGInteger+YGMath.h"
@implementation YGInteger (YGMath)
- (YGInteger *)add:(YGInteger *)i
{
YGInteger *result = [[YGInteger alloc]init];
result.integer = self.integer + i.integer;
return result;
}
- (YGInteger *)minus:(YGInteger *)i
{
YGInteger *result = [[YGInteger alloc]init];
result.integer = self.integer - i.integer;
return result;
}
- (YGInteger *)multiply:(YGInteger *)i
{
YGInteger *result = [[YGInteger alloc]init];
result.integer = self.integer * i.integer;
return result;
}
- (YGInteger *)divide:(YGInteger *)i
{
YGInteger *result =[[YGInteger alloc]init];
result.integer = self.integer / i.integer;
return result;
}
@end
YGInteger_YGChangeValue.h 最后，扩展方法中声明一下，转换的方法。
#import "YGInteger.h" @interface YGInteger () - (NSString *)changeValue; @end
先在storyBoard中先拖一个Label，用于显示结果，写一个show方法，用于把数据展示到模拟器中。
#import "ViewController.h"
#import "YGInteger+YGInit.h"
#import "YGInteger+YGMath.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *outputLabel;
- (void)show:(YGInteger *)i;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
YGInteger *int1 = [[YGInteger alloc]initWithInteger:1];
YGInteger *int2 = [[YGInteger alloc]initWithInteger:2];
YGInteger *int3 = [int1 add:int2];
self.outputLabel.text = [NSString stringWithFormat:@"%@",int3];
// [self show:[int1 add:int2]];
}
- (void)show:(YGInteger *)i
{
self.outputLabel.text = [NSString stringWithFormat:@"%@",i];
}
@end
仅此。
标签：turn 调用 扩展方法 扩展 within 个数 为什么 round eval
原文地址：http://www.cnblogs.com/Dog-Ping/p/6091118.html
