Xcode：Objective-C：類型不匹配

Question

產品構建成功，但測試失敗。我如何通過下面的STAssertEquals報告的類型不匹配失敗？

// TransactionSpec.m 

#import "Transaction.h" 

@interface TransactionSpec : SenTestCase 
@end 

@implementation TransactionSpec 

#pragma mark Properties 

- (void)testProperties { 
    Transaction *transaction = [[Transaction alloc] init]; 
    transaction.type = TransactionTypePay; 

    STAssertNotNil(transaction, @"transaction exists"); 
    STAssertEquals(transaction.type, TransactionTypePay, @"type property works"); // Type mismatch 
} 

@end 

// Transaction.h 

typedef enum { 
    TransactionTypePay, 
    TransactionTypeCharge 
} TransactionType; 

@interface Transaction : NSObject 

@property (nonatomic) TransactionType *type; 

@end 

// Transaction.m 

#import "Transaction.h" 

@implementation Transaction 

@synthesize type; 

@end 

Answer 1

你type屬性被聲明爲指針來枚舉，這可能不應該這樣

Answer 2

鑄造transaction.type到TransactionType修復該問題：

STAssertEquals((TransactionType)transaction.type, TransactionTypePay, @"type property works"); 

可是，我爲什麼要必須這樣做，因爲我聲明：

@property (nonatomic) TransactionType *type; 

Answer 3

您的type物業是指針到TransactionType（這可能不是預期的），而TransactionTypePay是一個實際的TransactionType。