iOSコールバック

コールバックの簡単な使用は、メモを残して、後で検索するのに便利です.
 
1,blocktypedefvoid(^signedRightJson)();
             typedef void(^signedErrorJson)();
2、定義中コピー
 
-(void)performActionWithCompletion:(signedRightJson)completion{
   
    completion();
    
 
}
3、呼び出し
   BlockDemo *bd= [[BlockDemoalloc]init];
        [bd performActionWithCompletion:^{
    
            
            NSLog(@"%@",d.price);
            
 
        }];
 
 
 
 
完全なコード:
 

typedef void(^signedRightJson)();
typedef void(^signedErrorJson)();

@interface BlockDemo : NSObject


// 
-(void)performActionWithCompletion:(signedRightJson) completion;

@end



#import "BlockDemo.h"

@implementation BlockDemo

-(void)performActionWithCompletion:(signedRightJson)completion{
   
    completion();
    
}

@end




BlockDemo *bd= [[BlockDemo alloc]init];
        [bd performActionWithCompletion:^{
    
            
            NSLog(@"%@",d.price);
            
        }];