ObjectC基礎之塊（Block）學習

用Java語言來說，OC中的Block有着類的感覺。但OC的類與block又有着不同之處，OC的類有.m和.h文件，即@interface 與@implementation。而Block卻沒有類，但是它有着屬性。舉個Block例子：

Bock基礎用法：

#import <Foundation/Foundation.h>

struct Books {
	NSString *title;
	NSString *author;
	NSString *subject;
	int book_id;
}

int main(){
	struct Books Book1;

	Book1.title = @"OC編程";
	Book1.author =@"Cook";
	Book1.subject = @"OC教程";
	Book1.book_id = 88888;
	
	NSLog(@"Book1 title : %@",Book1.title);
}

結構體作爲函數參數：

將結構體作爲函數參數傳遞，與傳遞變量或指針的方式非常相似。

#import <Foundation/Foundation.h>

/*結構聲明*/
struct Books {
	NSString *title;
	NSString *author;
	NSString *subject;
	int book_id;
}

@interface SampleClass : NSObject
/*函數聲明*/
- (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編程";
	book.book_id = 88888;

	SampleClass *splClass = [[SampleClass alloc] init];
	[splClass printBook: book1];
	
	return 0;
}

總結：OC的塊跟對象類似。以後用到的地方還是挺多的。

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