没有出现UIButton

Question

我是objective-c.

的新手谁能告诉我为什么当我运行代码时按钮没有出现。

这里是我的代码：

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    button1 = [[UIButton buttonWithType:UIButtonTypeRoundedRect]initWithFrame:CGRectMake(3, 3, 30, 30)]; 
    [button1 setTitle:@"haha" forState:UIControlStateNormal]; 
    [button1 setBackgroundColor: [UIColor blackColor]]; 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    [self.view addSubview:button1]; 
}  

Answer 1

在initWithNibName添加[self.view addSubview:button1];前行return self;

其他明智

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    button1 = [[UIButton buttonWithType:UIButtonTypeRoundedRect]initWithFrame:CGRectMake(3, 3, 30, 30)]; 
    [button1 setTitle:@"haha" forState:UIControlStateNormal]; 
    [button1 setBackgroundColor: [UIColor blackColor]]; 
    [self.view addSubview:button1]; 
} 

编辑：

检查，你是否设置了@property和@synthesize，正确吗???