Block 代理

代理
＊＊＊＊＊＊＊＊＊＊＊传旨方3步（定义协议 传递参数）＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
1)定义协议.方法
2)声明一个属性,记录代理对象
3)在合适的时机,给代理方发消息

.h
1,@protocol PaperClickDelegate <NSObject>
-(void)BtnClick:(PaperCellModel*)viewModel;
@end
2,@property(nonatomic,assign)id delegate;
.m
3,[self.delegate BtnClick:self.paperCellModel];

＊＊＊＊＊＊＊＊＊＊＊＊接旨方3步（遵守协议 实现方法）＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
1)遵守协议
2)实现方法
3)设置代理

.h
1, @interface PaperTestTableViewController() <PaperClickDelegate>
.m
2, cell.delegate=self;
3,-(void)BtnClick:(PaperCellModel*)viewModel{
[viewModel.paperModel.userMeta.currentPracticeId integerValue]
｝

Block
Block深究浅析(上篇)-Block本质
Block深究浅析(中篇)-内存管理与变量传递
Block深究浅析(下篇)-开发中使用场景
Objective-C中的Block

＊＊＊＊＊＊＊＊＊＊＊＊传值回调（逆向传值）＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊

场景:控制器的逆传实现方式很多,这里讲一下modal方式的block逆传.A控制器modal出B控制器,B控制器dismiss后传值给A控制器

1:声明一个带参数Block属性
2:在需要传值控制器中定义Block
3:在传值控制器中调用Block

***控制器B:  （声明block，传值）***
// ModalVC.h (1)  <也可以是view>
// 在要modal的控制器B声明一个带参数block属性
@property (nonatomic ,strong) void(^valueBlcok)(int value);
//@property(nonatomic,copy)void(^cellClickBlock)(NSString*msg);

// ModalVC.m   (3)
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    // 传值
    if (_valueBlock) {
        _valueBlock(@"123");
    }
    
    [self dismissViewControllerAnimated:YES completion:nil];
}

   // 点击事件触发block传值
//self.cellClickBlock(model.paperModel.ID);


-----------------------
***控制器A:  (2) （接收 处理后 的数据）***
2，
//回掉接值方
/*
.m
VC.cellClickBlock= ^(NSString*msg) {
DLog(@"点击的ID==%@",msg);
};
*/

// viewContent.m  (控制器获取点击view事件)
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    ModalViewController *modalVc = [[ModalViewController alloc] init];
 
    modalVc.valueBlock = ^(NSString *value){
      // 回调
        NSLog(@"%@",value);
        
    };
    
    [self presentViewController:modalVc animated:YES completion:nil];
}

＊＊＊＊＊＊＊＊＊＊＊＊＊＊Block 请求回调＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
B:

NetworkRequest.h
/**
 *  成功。
 *  @param responseObject 返回的数据。
 */
typedef void(^Succsess)(id responseObject);

/**
 *  失败。
 *  @param error 失败原因。
 */
typedef void(^Failure)(NSString *errorMessage);

+(void)requestWithParameter:(NSDictionary *)dic withSuccess:(Succsess)succsess andFailure:(Failure)failure;


NetworkRequset.m

+(void)requestWithParameter:(NSDictionary *)dic withSuccess:(Succsess)succsess andFailure:(Failure)failure{


   if(succsess){
                succsess(@{@"result":[NSNumber numberWithBool:YES],@"modelarray":mArray,@"myRankModel":myRank});
  }
   if(failure){
            DLog(@"error");
            failure([request.ErrorDic objectForKey:@"message"]);
     }


}



----------


HTIAPHelper.h

typedef void(^buyCompletionBlock)(NSString *identifier);
typedef void(^restoreCompletionBlock)(NSArray *products);
typedef void(^failedBlock)(NSString *reason);

// 回调块代码
@property (nonatomic, copy) buyCompletionBlock      buyCompletion;
@property (nonatomic, copy) restoreCompletionBlock  restoreCompletion;
@property (nonatomic, copy) failedBlock             failedBlock;


HTIAPHelper.m
- (void)buyProduct:(NSString *)identifier
        completion:(buyCompletionBlock)completion
            failed:(failedBlock)failed
{
    // 记录回调块代码
    self.buyCompletion = completion;
    self.failedBlock = failed;
}


// 回调传值
#warning -Break Cycle 是否要打破循环？
//注意：你可以直接在 block 回调中使用 self，不用担心循环引用。因为 YTKRequest 会在执行完 block 回调之后，将相应的 block 设置成 nil。从而打破循环引用。
   //  __weak typeof(self) wself = self;
    [requset startWithCompletionBlockWithSuccess:^(__kindof YTKBaseRequest *request) {
        NSInteger code = [[request.responseJSONObject objectForKey:@"code"] integerValue];
        if (code== 1000000) {
         //      __strong typeof(wself) sself = wself;
            self.buyCompletion(@"1000000");
       //       [sself->_buyCompletion addObject:@"1000000"];           
        }else
        {
         //     __strong typeof(wself) sself = wself;
            self.buyCompletion(@"-1");
       //       [sself->_buyCompletion addObject:@"-1"];
        }
        
        
    } failure:^(__kindof YTKBaseRequest *request) {
    if (_failedBlock) {
            _failedBlock([request.userInfo objectForKey:@"message"]);
        }
    }];

A:

    [[HTIAPHelper sharedIAPHelper] buyProduct:_Salemodel.inPurchaseProductId completion:^(NSString *identifier) {
        //identifier = self.buyCompletion(@"");
        if ([identifier isEqualToString:@"1000000"]) {
    //do SomeThings
}
    } failed:^(NSString *reason) {
//reason==  _failedBlock()
    //do SomeThings
    }];