iOS中的链式编程的应用

Copyright © 2017年ZaneWangWang. All rights reserved.

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       说到链式编程在iOS中我们首先想到的应该就是masonry框架,示例如下图:

masonry使用

这种打点式的代码风格会使得我们的代码的可读性很好,下边我们就来写一个计算器的例子来剖析一下链式编程的思想.

1.首先创建一个NSobject类别Calculator,并在其中创建Calculator类

.h内容如下:

//

//NSObject+Calculator.h

//Created by iOS on 17/2/28.

//Copyright © 2017年iOS. All rights reserved.

//

#import

@classCalculator;

typedefvoid(^Mask)(Calculator*calculator);

@interfaceNSObject (Calculator)

//加法

+ (float)calculatorNumber:(Mask)calculator;

@end

@interface Calculator :NSObject

@property(nonatomic,assign)floatvalue;

- (Calculator*(^)(float))add;

- (Calculator*(^)(float))min;

- (Calculator*(^)(float))mul;

- (Calculator*(^)(float))div;

@end

.m内容如下

//

//NSObject+Calculator.m

//Created by iOS on 17/2/28.

//Copyright © 2017年iOS. All rights reserved.

//

#import"NSObject+Calculator.h"

@implementationNSObject (Calculator)

+ (float)calculatorNumber:(Mask)calculator{

Calculator*cal = [[Calculatoralloc]init];

calculator(cal);

return cal.value;

}

@end

@implementationCalculator

-(Calculator*(^)(float))add{

return^(floatvalue){

_value+= value;

returnself;

};

}

-(Calculator*(^)(float))min{

return^(floatvalue){

_value-= value;

returnself;

};

}

-(Calculator*(^)(float))mul{

return^(floatvalue){

_value*= value;

returnself;

};

}

-(Calculator*(^)(float))div{

return^(floatvalue){

_value/= value;

returnself;

};

}

@end

2.测试代码如下: