如何获得块内变量的值

Question

有无论如何用completionHandler检查'type'变量的值。

-(void)sendApiMethod:(NSString*)apiName ApiType:(NSString*)type 
{ 
[SendAPI setAPIWithName:@"APIName" completionHandler:^(NSArray *errors) { 
     if([type isEqualToString:@"Login"]) 
     { 
      /// Call Some Other function 
     } 
    }]; 
} 

Answer 1

我写了一小段代码来验证作品（仅读出你的问题我会说是因为Droppy）

我添加了所有的代码有一个视图控制器在一个简单的查看程序。 一些假设： - 所有的代码为了semplicity .... - 我已经添加了一个单身，因为它似乎你正在调用一个类的方法。 - 实例方法有点粗糙，它只是保存名称和块 - 我添加了块的typedef以更好地阅读它。

#import "ViewController.h" 



typedef void (^CompletionBlock)(NSArray *errors); 


@interface SendAPI : NSObject 

-(void)setAPIWithName:(NSString*)name completionHandler: (CompletionBlock)completionHandler; 
+(void)setAPIWithName:(NSString*)name completionHandler: (CompletionBlock)completionHandler; 
+(SendAPI*)sharedInstance; 

@property (strong) CompletionBlock completionBlock; 
@property (strong) NSString * name; 

@end 


@implementation SendAPI : NSObject 

static SendAPI * _singleton = nil; 



+(SendAPI*)sharedInstance 
{ 
    if (_singleton == nil) 
    { 
     _singleton = [[SendAPI alloc] init]; 
    } 
    return _singleton; 
} 


-(void)setAPIWithName:(NSString*)name completionHandler: (CompletionBlock)completionHandler; 
{ 
    self.completionBlock = completionHandler; 
    self.name = [name copy]; 

    __weak SendAPI * weakRef = self; 


    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 

     NSError* err = [NSError errorWithDomain: @"delayed" 
              code:1111 
             userInfo: @{@"info": self.name} 
         ]; 

     weakRef.completionBlock(@[err]); 

    }); 

} 


+(void)setAPIWithName:(NSString*)name completionHandler: (CompletionBlock)completionHandler; 
{ 
    [[SendAPI sharedInstance]setAPIWithName:name completionHandler:completionHandler]; 

} 


@end 





@interface ViewController() 

@end 

@implementation ViewController 

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    [self sendApiMethod:@"HELLO" ApiType: @"Login"]; 
} 




-(void)sendApiMethod:(NSString*)apiName ApiType:(NSString*)type{ 

    [SendAPI setAPIWithName:@"APIName" completionHandler:^(NSArray *errors) { 
    if([type isEqualToString:@"Login"]) 
    { 
     /// Call Some Other function 
     NSLog(@"%@", errors); 
    } 
}]; 
} 

它LOG正确