Question

我创建了一个类，我试图访问公共方法中的一些属性，但我不能，编译器不允许，我真的需要一些帮助。这是我的代码，我指望你们。还有其他方法吗？

.h文件

@interface DirController : NSObject



+ (void)startCreate;
+(DirController *)getInstace;



@property (strong, nonatomic) NSString * nomeDiretorio;
@property (strong, nonatomic) NSString * enderecoUrl;
@property (strong, nonatomic) NSString * nomeUsuario;
@property (strong, nonatomic) NSString * senha;
//@property (strong, nonatomic) NSString * nomeCliente;
@property (nonatomic, assign, readonly ) BOOL              isCreating;
@property (nonatomic, strong, readwrite) NSOutputStream *  networkStream;

.m文件

+ (void)startCreate
{
    BOOL                    success;
    NSURL *                 url;

  //  assert(self.networkStream == nil);      // don't tap create twice in a row!

    // First get and check the URL.

    url = [[NetworkManager sharedInstance] smartURLForString:self.enderecoUrl];
    success = (url != nil);

    if (success) {
        url = CFBridgingRelease(
                                CFURLCreateCopyAppendingPathComponent(NULL, (__bridge CFURLRef) url, (__bridge CFStringRef) self.nomeDiretorio, true)
                                );
        success = (url != nil);
    }

    // If the URL is bogus, let the user know.  Otherwise kick off the connection.

    if ( ! success) {

    } else {



        self.networkStream = CFBridgingRelease(
                                               CFWriteStreamCreateWithFTPURL(NULL, (__bridge CFURLRef) url)
                                               );
        assert(self.networkStream != nil);

        if ([self.nomeUsuario length] != 0) {
            success = [self.networkStream setProperty:self.nomeUsuario forKey:(id)kCFStreamPropertyFTPUserName];
            assert(success);
            success = [self.networkStream setProperty:self.senha forKey:(id)kCFStreamPropertyFTPPassword];
            assert(success);
        }

        self.networkStream.delegate = self;
        [self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
        [self.networkStream open];

        // Tell the UI we're creating.

        [self createDidStart];
    }
}

Answer 1

那是因为方法startCreate不是实例方法，而是类方法。您无法访问类方法中的实例变量。

您可以将starCreate方法更改为实例方法，方法是在方法开头替换 - 符号的+号（假设您知道自己在做什么）。

Answer 2

一种类方法就是这样;关于班级的方法。没有实例存储状态。

您需要创建一个类的实例（即MyClass *myThing = [[MyClass alloc] init];，将您的类方法转换为实例方法，然后它才能正常工作。

如何在公共方法目标c中访问属性

2 个答案: