UIView转UIImage

- (UIImage *)snapshotImage {
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, 0);
    [self.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

效果：有​​黑底​​

iOS UIView转UIImage与CALayer转UIImage的差异_代码生成

CALayer转UIImage

- (UIImage *)snapshotImage {
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, self.opaque, 0);
    [self renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

效果：没黑底

iOS UIView转UIImage与CALayer转UIImage的差异_代码生成_02

一行代码生成渐变色

​​https://github.com/xjh093/JHDraw​​