Ios Imageview根本没有加载

在viewcontroller.h中，我正在执行此操作

@property( nonatomic, strong)IBOutlet UIImageView*showLogo;

在viewcontroller.m中，我正在执行此操作

   NSString*path=@"http://www.stboston.com/wp-content/uploads/2012/08/iStock_000004791880_1.jpg";

    NSURL *url = [NSURL URLWithString:path];
    NSData *data = [NSData dataWithContentsOfURL:url];
    UIImage *img = [[UIImage alloc] initWithData:data ];

 _showLogo=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 500)];
     _showLogo.image=img;

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尝试将其直接加载到_showLogo.image中

_showLogo=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 500)];
_showLogo.image = [UIImage imageWithContentsOfURL:@"http://www.stboston.com/wp-content/uploads/2012/08/iStock_000004791880_1.jpg"];
[self.view addSubview:_showLogo];

或

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是否将UIImageView添加到当前视图？[self.view addSubview:\u showLogo]；是的，将UIImageview添加到CurrentView这是一个很好的答案，我完全忘记了将其添加回视图中

NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.stboston.com/wp-content/uploads/2012/08/iStock_000004791880_1.jpg"]];
_showLogo.image = [UIImage imageWithData:imageData];
[self.view addSubview:_showLogo];