UIImageView控件

-(void)viewDidLoad

{

　　[super viewDidLoad];

　　//uiimage

　　UIImage *img = [[UIImageView alloc]initWithImage:img];

　　//image view

　　self.imageView = [[UIImageView alloc]initWithImage:img];

　　//full screen　　

　　self.imageView.frame = self.view.bounds;

　　//设置展示模式

　　self.imageView.contentMode  = UIViewContentModeScaleAspectFit;

　　self.imageView.center = self.view.center;

　　[self.view addSubView:self.imageView];

}