iOS 链式编程写法

iOS 链式编程写法

1.用’[]’实现连续调用

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Person.h:

- (Person *)eat2;
- (Person *)sleep2;
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Person.m:

- (Person *)eat2
{
    NSLog(@"%s",__FUNCTION__);
    return self;
}
- (Person *)sleep2
{
    NSLog(@"%s",__FUNCTION__);
    return self;
}
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ViewController.m:

[[person eat2] sleep2];
[[person sleep2] eat2];

2.用block实现链式

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Person.h:

- (Person * (^)(NSString *foodName))eat5;
- (Person * (^)(NSInteger hour))sleep5;
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Person.m:

- (Person *(^)(NSString *))eat5
{
    Person * (^eat5Block)() = ^(NSString *foodName) {
        NSLog(@"吃: %@",foodName);
        return self;
    };
    return eat5Block;
}
//上下两种写法一样
- (Person *(^)(NSInteger))sleep5
{
    return ^(NSInteger hour) {
        NSLog(@"睡了%ld小时",(long)hour);
        return self;
    };
}
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ViewController.m:

person.eat5(@"蛋糕").sleep5(8);
person.sleep5(8).eat5(@"面包");