ios 连式语法

@interface NSObject (LianShi)

+ (int)makeCalculate:(void (^)(CaculatorMaker *))block;

@end

@implementation NSObject (LianShi)
// 定义事件
+ (int)makeCalculate:(void (^)(CaculatorMaker *))block
{
    CaculatorMaker *caculatorMaker = CaculatorMaker.new;
    if (block) {
        block(caculatorMaker);
    }
    return caculatorMaker.all;
}

@end

@interface CaculatorMaker : NSObject

/** <##> */
@property int all;

- (CaculatorMaker *(^)(int value, int value2))add;

- (CaculatorMaker *(^)(int))sub;

@end

@implementation CaculatorMaker

- (CaculatorMaker *(^)(int value, int value2))add
{
    // return一个匿名block，参数int类型，block返回类型 CaculatorMaker *
    return ^CaculatorMaker *(int value, int value2) {
        NSLog(@"%d %d", value, value2);
        _all += value;
        return self;
    };
}

- (CaculatorMaker *(^)(int))sub
{
    return ^CaculatorMaker *(int value) {
        NSLog(@"%d", value);
        _all += value;
        return self;
    };
}

@end

// 用法
int all = [NSObject makeCalculate:^(CaculatorMaker *caculatorMaker) {
        caculatorMaker.add(2, 3).sub(5);
    }];
    NSLog(@"%d", all);