如何从UILabel创建图像？ [英] How to create an image from UILabel?

问题描述

我目前正在iphone上开发一个简单的Photoshop应用程序。当我想展平我的图层时，标签处于良好的位置，但字体大小不好。
这是我的代码展平：

I'm currently developing a simple photoshop like application on iphone. When I want to flatten my layers, the labels are at the good position but with a bad font size. Here's my code to flatten :

UIGraphicsBeginImageContext(CGSizeMake(widthDocument,widthDocument));

for (UILabel *label in arrayLabel) {
    [label drawTextInRect:label.frame];
}

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

任何人都可以帮助我吗？

Anybody can help me ?

推荐答案

来自：从UITextView或UILabel拉出UIImage会产生白色图像。

// iOS

- (UIImage *)grabImage {
    // Create a "canvas" (image context) to draw in.
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, 0.0);  // high res
    // Make the CALayer to draw in our "canvas".
    [[self layer] renderInContext: UIGraphicsGetCurrentContext()];

    // Fetch an UIImage of our "canvas".
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    // Stop the "canvas" from accepting any input.
    UIGraphicsEndImageContext();

    // Return the image.
    return image;
}

// Swift扩展w /用法。信用@Heberti Almeida在下面评论

// Swift extension w/ usage. credit @Heberti Almeida in below comments

extension UIImage {
    class func imageWithLabel(label: UILabel) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(label.bounds.size, false, 0.0)
        label.layer.renderInContext(UIGraphicsGetCurrentContext()!)
        let img = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return img
    }
}

用法：

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 30, height: 22))
label.text = bulletString
let image = UIImage.imageWithLabel(label)

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