iOS 使用UIColor 设置setBackgroundImage [2024-04-09]

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OC版本

 // 创建一个UIColor对象
    UIColor *color = [UIColor blueColor];
    // 将UIColor转换为UIImage
    UIGraphicsBeginImageContext(CGSizeMake(1, 1)); // 设置图片大小
    [color setFill];
    UIRectFill(CGRectMake(0, 0, 1, 1));
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    [readBtn setBackgroundImage:image forState:UIControlStateHighlighted];

Swift版本

方法一直接使用setBackgroundImage方法

let button = UIButton(type: .system)
button.frame = CGRect(x: 100, y: 100, width: 200, height: 50)
button.setTitle("Button", for: .normal)

// 创建一个宽高为1x1的纯色图片作为背景
let color = UIColor.red
let image = UIImage(color: color, size: CGSize(width: 1, height: 1))
button.setBackgroundImage(image, for: .normal)

方法二使用UIImage.resizeableImage方法

let button = UIButton(type: .system)
button.frame = CGRect(x: 100, y: 100, width: 200, height: 50)
button.setTitle("Button", for: .normal)

let color = UIColor.red
let image = UIImage.resizeableImage(with: color, size: CGSize(width: 1, height: 1))
button.setBackgroundImage(image, for: .normal)

self.view.addSubview(button)




extension UIImage {
    static func resizeableImage(with color: UIColor, size: CGSize) -> UIImage {
        let rect = CGRect(origin: .zero, size: size)
        UIGraphicsBeginImageContextWithOptions(rect.size, false, 0)
        color.setFill()

        UIRectFill(rect)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image ?? UIImage()
    }
}

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