七.类族设计模式

1.用统一的父类创建类接口穿件对象，具体实现都在各自子类。（UIButton NSArray 都是类簇模式）

//  HuEmployee.h
#import 

typedef NS_ENUM(NSUInteger, HuEmployeeType){
    HuEmployeeTypeDeveloper,
    HuEmployeeTypeDesigner,
    HuEmployeeTypeFinance,
};

@interface HuEmployee : NSObject
@property(nonatomic, copy)NSString *name;
@property(nonatomic, assign)NSUInteger salary;

//1.定义类方法，根据不同type，放回同一父类对象
+(HuEmployee*)employeeWithType:(HuEmployeeType)type;

-(void)doWork;

@end

//  HuEmployee.m
#import "HuEmployee.h"

//3.定义各自子类
@interface HuEmployeeDeveloper : HuEmployee

@end

@implementation HuEmployeeDeveloper

-(void)doWork
{
    [self writeCode];
}

-(void)writeCode
{
    /////
}

@end

@interface HuEmployeeDesigner : HuEmployee

@end

@implementation HuEmployeeDesigner

-(void)doWork
{
    [self desighApp];
}

-(void)desighApp
{
    /////
}
@end

@interface HuEmployeeFinance : HuEmployee

@end

@implementation HuEmployeeFinance

-(void)doWork
{
    [self manageFinance];
}

-(void)manageFinance
{
    ////
}
@end

@implementation HuEmployee

//2.抽象基类没有特殊标识，一般不定义init方法 也不实现抽象函数，各自在子类里实现
+(HuEmployee*)employeeWithType:(HuEmployeeType)type
{
    switch (type) {
        case HuEmployeeTypeDeveloper:
            return [HuEmployeeDeveloper new];
            break;
        case HuEmployeeTypeDesigner:
            return [HuEmployeeDesigner new];
            break;
        case HuEmployeeTypeFinance:
            return [HuEmployeeFinance new];
            break;
        default:
            break;
    }

    return nil;
}

-(void)doWork
{
    //2.1抛出一个异常，避免在基类里面实现
    NSException *e = [NSException
                      exceptionWithName: @"exceptionName"
                      reason: @"必须在子类实现改方法"
                      userInfo: nil];
    @throw e;
}

@end

2.判断莫类是否属于是一个特定之类

@interface HuBusinessSupport : NSObject

@end

@implementation HuBusinessSupport

-(void)doSomeTest
{
    HuEmployee *employee = [HuEmployee employeeWithType:HuEmployeeTypeDeveloper];
    //4.判断是否属于某个子类
//    //4.1不用要如下方法检测，一直成立
//    if ([employee isMemberOfClass:[HuEmployee class]]){
//        //一直为true
//    }
    //4.2用如下方法  直接用子类判断
    if([employee isKindOfClass:[HuEmployeeDeveloper class]])
    {
        //正确
    }
}

@end

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