1. 链式编程
要实现的效果: make.left.equalTo(superview.mas_left)
分析只有 block 可以用()调用方法. 所以 make.应该返回 block
void(^block)() = ^{
//code...
};
block();
例如:
self.test();
- (void(^)())test{
voie(^block)() = ^{
//code...
};
}
2. 函数式编程
mgr.add(5).add(6).add(7);
mgr.add 返回一个 block
block返回 mgr 就可继续调用 block 了.
例子:
#import <Foundation/Foundation.h>
@interface CaculatorManager : NSObject
@property (nonatomic, assign)NSInteger result;
- (CaculatorManager *)caculator : (NSInteger(^)(NSInteger result))block;
- (void)log;
@end
#import "CaculatorManager.h"
@implementation CaculatorManager
- (CaculatorManager *)caculator:(NSInteger (^)(NSInteger))block{
_result = block(_result);
NSLog(@"%ld", _result);
return self;
}
- (void)log{
NSLog(@"%ld", _result);
}
@end
#import "ViewController.h"
#import "CaculatorManager.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
CaculatorManager *mgr = [[CaculatorManager alloc] init];
[[mgr caculator:^NSInteger(NSInteger result) {
result += 5;
return result;
}] log];
}
@end
