我需要让我的 UIImageView 适合我的 UIScrollView 而不平移。 [iOS]

Question

我在 iOS UIScrollView 中有一个图像，它只占用了大约 1/3 的总屏幕空间。图像太大，所以 scrollView 允许在图像周围平移。我希望图像足够小，这样就不需要平移来查看整个图像。如何调整图像大小以使其适合滚动视图？

这是我用来设置图像视图和滚动视图的代码。

UIImage *image = [UIImage imageNamed:@"banner.png"];
self.imageView = [[UIImageView alloc] initWithImage:image];
self.imageView.frame = (CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=image.size};
[self.scrollView addSubview:self.imageView];

self.scrollView.contentSize = image.size;

Answer 1

你不能不把imageView的frame作为图片的大小（因为图片太大了）。根据需要设置图像视图的框架并设置图像内容模式。

您可能需要选择正确的图像内容模式

self.imageView.contentMode = (Pick right content mode you need)

typedef NS_ENUM(NSInteger, UIViewContentMode) {
    UIViewContentModeScaleToFill,
    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent
    UIViewContentModeScaleAspectFill,     // contents scaled to fill with fixed aspect. some portion of content may be clipped.
    UIViewContentModeRedraw,              // redraw on bounds change (calls -setNeedsDisplay)
    UIViewContentModeCenter,              // contents remain same size. positioned adjusted.
    UIViewContentModeTop,
    UIViewContentModeBottom,
    UIViewContentModeLeft,
    UIViewContentModeRight,
    UIViewContentModeTopLeft,
    UIViewContentModeTopRight,
    UIViewContentModeBottomLeft,
    UIViewContentModeBottomRight,
};

Answer 2

您需要将 ImageView 的大小设置为等于 scrollView 的大小。并将imageView的内容模式设置为缩放填充 例如：

UIImage *image = [UIImage imageNamed:@"banner.png"];
self.imageView = [[UIImageView alloc] initWithImage:image]
self.imageView.frame = CGRectMake (0,0,self.scrollView.frame.size.width,self.scrollView.frame.size.height);

self.imageView.contentMode = UIViewContentModeScaleToFill;
[self.scrollView addSubview:self.imageView];
self.scrollView.contentSize = self.imageView.frame.size;
self.scrollView.bounces = NO;