UIImageView是一个用于显示图片的控件
构造方法:
UIImage * tempImage = [UIImage imageNamed:IMAGE_NAME];
imageView = [[UIImageView alloc] initWithImage:tempImage];
常用方法:
imageView.frame = [self fitScreenFrameWithHeight:tempImage.size.height Length:tempImage.size.width];
[imageView setAlpha:0];
[self.view addSubview:imageView];