OC语言学习23-Block在类中的应用

创建Mother类和OldWoman类：

Mother.h中的代码：

#import <Foundation/Foundation.h>

@interface Mother : NSObject

@property(nonatomic,copy)NSString *name;

//block作为属性运用

@property(nonatomic,copy)void(^actionBlock)();

//block当参数传递

-(void)goOutsideWithAction:(void (^)())action;

-(void)cooking;

@end

Mother.m中的代码：

#import "Mother.h"

@implementation Mother

-(void)goOutsideWithAction:(void (^)())action

{

    NSLog(@"去上班了");

    action();

}

-(void)cooking

{

    NSLog(@"我去做饭了");

 //   self.actionBlock();

    if(self.actionBlock) {

        self.actionBlock();

    }

}

@end

OldWoman.h中的代码：

#import <Foundation/Foundation.h>

@interface OldWoman : NSObject

-(void)lookAfterBaby;

@end

OldWoman.m中的代码:

#import "OldWoman.h"

@implementation OldWoman

-(void)lookAfterBaby

{

    NSLog(@"我帮你照顾宝宝");

}

@end

main.m中代码

#import <Foundation/Foundation.h>

#import "Mother.h"

#import "OldWoman.h"

int main(int argc,const char * argv[]) {

    @autoreleasepool {

        Mother *mother = [[Motheralloc] init];

        OldWoman *oldWoman = [[OldWomanalloc] init];

        /*mother执行goOutsideWithAction方法后

        通知oldWoman执行lookAfterBaby方法*/

        [mother goOutsideWithAction:^{

            [oldWoman lookAfterBaby];

        }];

        /*因为block作为属性自动生成setter和getter方法

         mother可以直接执行setActionBlock方法然后

         通知oldWoman执行lookAfterBaby方法*/

        [mother setActionBlock:^{

            [oldWoman lookAfterBaby];

        }];

        [mother cooking];

    }

    return0;

}