Question

我正在使用UIScrollview来缩放图像..我的UIScrollview大小是固定的，所以每当我对图像进行缩放然后它就会被剪切..我想这样做，因为我缩放图像UIScrollview也增加高度和宽度根据图像缩放.. 任何建议将不胜感激......

Answer 1

这应该有效： - ）

制作UIImage
制作一个UIImageView，保存图像
将UIImageView放入UIScrollView
将UIScrollView的contentSize设置为UIImage的大小
请记住在viewForZoomingInScrollView

将它放入.h文件中：

UIImageView *imageView;

@property (nonatomic, retain) UIImageView *imageView;

请记住合成并发布imageView

将它放在您想要滚动视图的位置：

UIImage *image = [UIImage imageNamed:@"myImage.jpg"];
imageView = [[UIImageView alloc] initWithImage:image];
[imageView setFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[scrollView setMinimumZoomScale:0.5];
[scrollView setMaximumZoomScale:3.0];
[scrollView setContentSize:CGSizeMake(image.size.width, image.size.height)];
[scrollView setDelegate:self];
[scrollView addSubview:imageView];
[[self view] addSubview:scrollView];
[scrollView release];

添加UIScrollView委托方法

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
    return imageView;
}

<强>更新

我在添加上述解决方案时误解了这个问题。这应该这样做： - ）

kScrollViewAddSize是一个常量，它定义了添加到UIScrollView大小的数量。

在你的.h文件中，你应该添加以下内容：

UIImageView *imageView;
UIScrollView *scrollView;

请记住合成并发布它们。

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIImage *image = [UIImage imageNamed:@"apple.jpg"];
    imageView = [[UIImageView alloc] initWithImage:image];
    [imageView setFrame:CGRectMake(kScrollViewAddSize / 2, kScrollViewAddSize / 2, image.size.width, image.size.height)];
    int width = imageView.frame.size.width + kScrollViewAddSize;
    int height = imageView.frame.size.height + kScrollViewAddSize;
    scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake((self.view.frame.size.width - width) / 2, (self.view.frame.size.height - height) / 2, width, height)];
    [scrollView setMinimumZoomScale:0.5];
    [scrollView setMaximumZoomScale:3.0];
    [scrollView setBackgroundColor:[UIColor redColor]];
    [scrollView setContentSize:CGSizeMake(image.size.width, image.size.height)];
    [scrollView setDelegate:self];
    [scrollView addSubview:imageView];
    [[self view] addSubview:scrollView];
}

- (void)scrollViewDidZoom:(UIScrollView *)_scrollView {
    int width = imageView.frame.size.width + kScrollViewAddSize;
    int height = imageView.frame.size.height + kScrollViewAddSize;
    [scrollView setFrame:CGRectMake((self.view.frame.size.width - width) / 2, (self.view.frame.size.height - height) / 2, imageView.frame.size.width + kScrollViewAddSize, imageView.frame.size.height + kScrollViewAddSize)];
}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)_scrollView {
    return imageView;
}

在viewDidLoad中添加要创建UIScrollView的parth并添加两个委托方法。

如何动态调整UIScrollview的大小

1 个答案: