UYLPasswordManager中對象的潛在泄漏

Question

我嘗試使用來自iOS and Keychain Migration and Data Protection - Part 3的UYLPasswordManager，並在分析[結果發佈]代碼行中存在對象的潛在泄漏時收到警告。這是一個真正的潛在泄漏？如果是的話，我該如何解決它？如果不是，我該如何沉默警告？我的項目使用ARC，但我用UYLPasswordManager對象的標誌關閉了它。

- (void)searchKeychain { 

if (self.keychainValue == nil) { 
NSMutableDictionary *searchDictionary = [self newSearchDictionary]; 

[searchDictionary setObject:(id)kSecMatchLimitOne 
        forKey:(id)kSecMatchLimit]; 
[searchDictionary setObject:(id)kCFBooleanTrue 
        forKey:(id)kSecReturnData]; 

NSData *result = nil; 
OSStatus status = SecItemCopyMatching((CFDictionaryRef)searchDictionary, 
             (CFTypeRef *)&result); 
[searchDictionary release]; 

if (result) { 
    self.keychainValue = [[NSString alloc] initWithData:result 
          encoding:NSUTF8StringEncoding]; 
    [result release]; 
} 
} 
} 

Answer 1

假設您的keychainValue屬性被聲明爲複製或保留其正在創建的新NSString。添加像這樣的自動發佈消息：

self.keychainValue = [[[NSString alloc] initWithData:result encoding: NSUTF8StringEncoding] autorelease];