代码生成纯色uiimage

最新推荐文章于 2024-04-12 12:17:52 发布

原创最新推荐文章于 2024-04-12 12:17:52 发布 · 4.4k 阅读

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本文介绍了如何使用UIKit框架中的UIGraphicsBeginImageContextWithOptions等方法来创建一个特定尺寸且具有固定颜色的图片。此外，还提供了另一种方法，通过利用当前绘图上下文并结合UIImage进行裁剪来填充指定颜色。

CGSize imageSize =CGSizeMake(50,50);

UIGraphicsBeginImageContextWithOptions(imageSize,0, [UIScreenmainScreen].scale);

[RGBA(206,58, 216, 1) set];

UIRectFill(CGRectMake(0,0, imageSize.width, imageSize.height));

UIImage *pressedColorImg =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

或者：

You will want to clip the context to an image mask and then fill with a solid color:

- (void)drawRect:(CGRect)rect
{
    CGRect bounds = [self bounds];
    [[UIColor blackColor] set];
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextClipToMask(context, bounds, [myImage CGImage]);
    CGContextFillRect(context, bounds);
}

Note: myImage should be an instance variable that contains an UIImage. I'm not sure whether it takes the mask from the alpha channel or the intensity so try both.