没有可见@interface为'UIView'声明选择器'addSubView：'

Question

我对iOS很新，我试图在我的视图控制器中添加UIActivityIndi​​cator，但它显示错误“没有可见的@interface for'UIView '声明选择器'addSubView：'“。我将自己的reference.can任何代码提示我怎么能纠正这个问题

-(void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; 
    spinner.center = CGPointMake([[UIScreen mainScreen]bounds].size.width/2, [[UIScreen mainScreen]bounds].size.height/2); 
    [_bcview addSubView:spinner];//bcview is the outlet connection for my viewcontroller 
} 

Answer 1

功能addSubview:拼写与一个小写v。所以你应该改变addSubView到addSubview

一般来说，你可以使用Xcode内建的建议功能，它会向你建议功能来解决这样的问题。

Answer 2

此代码的工作对我来说：

- (void)viewDidLoad{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 

    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; 

    CGSize size = [[UIScreen mainScreen] bounds].size; 
    [activityIndicator setCenter:CGPointMake(size.width/2, size.height/2)]; 

    [activityIndicator startAnimating]; 
    [_statusView addSubview:activityIndicator]; 
} 

与声明中的.h

@property (weak, nonatomic) IBOutlet UIView *statusView;