向UIImageView添加反射的最有效方法是什么

Question

我只想要一个最容易在UIImageVies下进行反射的方法,这个方法很容易管理.

Answer 1

只需使用iPhone SDK库中的示例代码即可

更新:链接现已更新到新位置

Answer 2

正如Phil所说,你可以有一个"反映"的UIImageView实例:

@interface ReflectedImageView : UIView 
{
@private
    UIImageView *_imageView;
    UIImageView *_imageReflectionView;
}

@property (nonatomic, retain) UIImage *image;

@end

然后,在您的实现中,这样的事情

@implementation ReflectedImageView

@dynamic image;

- (id)initWithFrame:(CGRect)frame 
{
    if (self = [super initWithFrame:frame]) 
    {
        self.backgroundColor = [UIColor clearColor];

        // This should be the size of your image:
        CGRect rect = CGRectMake(0.0, 0.0, 320.0, 290.0);

        _imageReflectionView = [[UIImageView alloc] initWithFrame:rect];
        _imageReflectionView.contentMode = UIViewContentModeScaleAspectFit;
        _imageReflectionView.alpha = 0.4;
        _imageReflectionView.transform = CGAffineTransformMake(1, 0, 0, -1, 0, 290.0);
        [self addSubview:_imageReflectionView];

        _imageView = [[UIImageView alloc] initWithFrame:rect];
        _imageView.contentMode = UIViewContentModeScaleAspectFit;
        [self addSubview:_imageView];
    }
    return self;
}

- (void)setImage:(UIImage *)newImage
{
    _imageView.image = newImage;
    _imageReflectionView.image = newImage;
}

- (UIImage *)image
{
    return _imageView.image;
}

- (void)dealloc 
{
    [_imageView release];
    [_imageReflectionView release];
    [super dealloc];
}

@end