标签：
Model类
.h
#import <Foundation/Foundation.h>
@interface Product : NSObject
@property (nonatomic,assign) NSNumber *weight;
@property (nonatomic,copy) NSString *color;
@end
.m
无增加内容
viewcontroller.h
@interface ColorSpec :NSObject
@property (nonatomic, copy) NSString *color;
@end
@implementation ColorSpec
+ (instancetype)specWithColor:(NSString *)color
{
ColorSpec *spec = [[ColorSpec alloc] init];
spec.color = color;
return spec;
}
- (BOOL)satisfy:(Product *)product
{
return [product.color isEqualToString:_color];
}
@end
@interface BelowWeightSpec :NSObject
@property (nonatomic, assign) int limit;
@end
@implementation BelowWeightSpec
+ (instancetype)specWithBelowWeight:(float)limit
{
BelowWeightSpec *spec = [[BelowWeightSpec alloc] init];
spec.limit = limit;
return spec;
}
- (BOOL)satisfy:(Product *)product
{
return ([product.weight intValue] < _limit);
}
@end
@interface ViewController ()
{
NSMutableArray *_datas;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self setupModel];
}
- (void)setupModel{
_datas = [[NSMutableArray alloc]init];
for (int i = 0; i < 1000 ; i ++) {
Product *product = [Product new];
product.weight = [NSNumber numberWithInt:i%11];
product.color = [self getColorWithInt:i];
[_datas addObject:product];
}
}
- (NSString *)getColorWithInt:(int)index{
switch (index%9) {
case 0:
{
return @"GREEN";
}
break;
case 1:
{
return @"BLACK";
}
break;
case 2:
{
return @"RED";
}
break;
case 3:
{
return @"WHIRT";
}
break;
case 4:
{
return @"GRAY";
}
break;
case 5:
{
return @"LIGHT";
}
break;
case 6:
{
return @"ORANGE";
}
break;
case 7:
{
return @"BLUE";
}
break;
case 8:
{
return @"YELLOW";
}
break;
default:
break;
}
return nil;
}
// 01.在仓库里找到所有颜色为红色的产品
- (NSArray *)findAllRedProducts:(NSArray *)products{
NSMutableArray *list = [@[]mutableCopy];
for (Product *obj in products) {
if ([obj.color isEqualToString:@"RED"]) {
[list addObject:obj];
}
}
return list;
}
// 02.在仓库中查找所有颜色为绿色的产品<参数化设置>
- (NSArray *)findProducts:(NSArray *)products byColor:(ColorSpec *)color
{
NSMutableArray *list = [@[] mutableCopy];
for (Product *product in products) {
if ([color satisfy:product]) {
[list addObject:product];
}
}
return list;
}
// 03.查找所有重量小于10的所有产品
- (NSArray *)findProducts:(NSArray *)products bySpec:(BelowWeightSpec *)spec
{
NSMutableArray *list = [@[] mutableCopy];
for (Product *product in products) {
if ([spec satisfy:product]) {
[list addObject:product];
}
}
return list;
}
- (IBAction)findREDClick:(UIButton *)sender {
NSArray *redArr = [self findProducts:_datas byColor:[ColorSpec specWithColor:@"RED"]];
NSLog(@"---- all RED :%tu",redArr.count);
NSArray *greenArr = [self findProducts:_datas byColor:[ColorSpec specWithColor:@"GREEN"]];
NSLog(@"---- all GREEN :%tu",greenArr.count);
NSArray *small10Arr = [self findProducts:_datas bySpec:[BelowWeightSpec specWithBelowWeight:10]];
NSLog(@"---- all < 10 : %tu",small10Arr.count);
}
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原文地址：http://www.cnblogs.com/XHShare/p/4924701.html
