Question

我正在尝试使用以下屏幕截图：

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    UIGraphicsBeginImageContextWithOptions(self.contentView.bounds.size, NO, [UIScreen mainScreen].scale);
} else {
    UIGraphicsBeginImageContext(self.contentView.bounds.size);
}

[self.contentView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

但是，保存的图像在屏幕快照中不包含图像（而是显示为白色）。为什么会这样？

任何帮助表示赞赏。

Answer 1

尝试一下

if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
    UIGraphicsBeginImageContextWithOptions(self.image.bounds.size, NO, 2.0);
} else {
    UIGraphicsBeginImageContext(self.image.bounds.size);
}

[self.image drawViewHierarchyInRect:self.image.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageData = UIImagePNGRepresentation(image);
if (imageData) {
    [imageData writeToFile:@"screenshot.png" atomically:YES];
} else {
    NSLog(@"error while taking screenshot");
}

以编程方式拍摄屏幕快照时，视图中的UIImage没有保存-Objective-C

1 个答案: