正常绘制
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UIGraphicsBeginImageContext
UIGraphicsBeginImageContext(self.view.bounds.size); [self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
绘制拓展
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UIGraphicsBeginImageContextWithOptions
CGFloat scale = [UIScreen mainScreen].scale; UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, scale); [self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
补充
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截取需要的部分视图
UIImage *clipImage = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(viewImage.CGImage, CGRectMake(x, y, w, h))];
