我目前正在 iPhone 上开发一个简单的类似 Photoshop 的应用程序。当我想要展平图层时,标签位于良好的位置,但字体大小不佳。
这是我要展平的代码:
UIGraphicsBeginImageContext(CGSizeMake(widthDocument,widthDocument));
for (UILabel *label in arrayLabel) {
[label drawTextInRect:label.frame];
}
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
有人可以帮助我吗?
From: 从 UITextView 或 UILabel 中提取 UIImage 会给出白色图像 https://stackoverflow.com/questions/2444140/pulling-an-uiimage-from-a-uitextview-or-uilabel-gives-white-image?rq=1.
// 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;
}
// 带有用法的 Swift 扩展。在下面的评论中注明@Heberti Almeida
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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