ObjectC基础之块（Block）学习

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 

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 

/*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。

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