ObjectC基础之块（Block）学习

迷南。 2021-08-30 18:53 440阅读 0赞

用Java语言来说，OC中的Block有着类的感觉。但OC的类与block又有着不同之处，OC的类有`.m`和`.h`文件，即`@interface` 与`@implementation`。而`Block`却没有类，但是它有着属性。举个Block例子：

## Bock基础用法： ##

#import <Foundation/Foundation.h>
    
    struct Books { 
    	NSString *title;
    	NSString *author;
    	NSString *subject;
    	int book_id;
    }
    
    int main(){ 
    	struct Books Book1;
    
    	Book1.title = @"OC编程";
    	Book1.author =@"Cook";
    	Book1.subject = @"OC教程";
    	Book1.book_id = 88888;
    	
    	NSLog(@"Book1 title : %@",Book1.title);
    }

## 结构体作为函数参数： ##

将结构体作为函数参数传递，与传递变量或指针的方式非常相似。

#import <Foundation/Foundation.h>
    
    /*结构声明*/
    struct Books { 
    	NSString *title;
    	NSString *author;
    	NSString *subject;
    	int book_id;
    }
    
    @interface SampleClass : NSObject
    /*函数声明*/
    - (void) printBook:(struct Books) book;
    @end
    
    @implementation SampleClass
    
    - (void)printBook:(struct Books) book { 
    	NSLog(@"Book title: %@",book.title);
    }
    @end
    
    int main(){ 
    	struct Books book1;
    	
    	book1.title = @"OC";
    	book.author = @"Cook";
    	book.subject = @"OC编程";
    	book.book_id = 88888;
    
    	SampleClass *splClass = [[SampleClass alloc] init];
    	[splClass printBook: book1];
    	
    	return 0;
    }

总结：OC的块跟对象类似。以后用到的地方还是挺多的。

更多课程请访问个人主页：

[Github搭建个人博客（2019最新版,亲测][Github_2019]

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[Github_2019]: https://blog.csdn.net/xudailong_blog/article/details/78762262
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