– (void)viewDidLoad
{
[super viewDidLoad];
UIImage *img = [UIImage imageNamed:@”my.jpg”];
UIImageView *imageView = [[UIImageView alloc] initWithImage:img];
imageView.frame = CGRectMake(0, 0, 300, 100);//容器尺寸
[imageView setContentMode:UIViewContentModeScaleAspectFit];//根据容器尺寸缩放
imageView.image = img;
imageView.center = self.view.center;//剧中
[self.view addSubview:imageView];
}