UIViewContentMode详解

最新推荐文章于 2024-10-18 10:13:43 发布

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最新推荐文章于 2024-10-18 10:13:43 发布 · 3.3k 阅读

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#contentMode #UIViewContentMode

这篇博客详细解析了UIView的contentMode属性，通过不同的UIViewContentMode设置，可以改变视图内容的显示方式，包括按比例填充、适应、居中、重绘等，确保图片在视图中得到适当的展示。

UIView有个UIViewContentMode类型的属性contentMode，可以通过它来修改视图的内容显示模式。

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,
};

实例代码：

    CGRect rect = self.view.frame;
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:rect];
    imageView.contentMode = UIViewContentModeTop;
    imageView.image = [UIImage imageNamed:@"demoImage"];
    [self.view addSubview:imageView];

UIViewContentModeScaleToFill

根据视图的比例去拉伸图片内容。