Image 通过AirPrint打印临时保存的图像
我有一个问题。是否可以打印仅临时保存的图像? 我保存了图像,因为它是在一个关于stackoverflow的问题中这样做的 但是当我试图用这张图片通过AirPrint打印时,它不起作用Image 通过AirPrint打印临时保存的图像,image,cocoa-touch,temporary,airprint,Image,Cocoa Touch,Temporary,Airprint,我有一个问题。是否可以打印仅临时保存的图像? 我保存了图像,因为它是在一个关于stackoverflow的问题中这样做的 但是当我试图用这张图片通过AirPrint打印时,它不起作用 - (IBAction)btnPrintTapped:(id)sender { UIImage* image = nil; UIGraphicsBeginImageContext(_scrollView.contentSize); { CGPoint savedConte
- (IBAction)btnPrintTapped:(id)sender {
UIImage* image = nil;
UIGraphicsBeginImageContext(_scrollView.contentSize);
{
CGPoint savedContentOffset = _scrollView.contentOffset;
CGRect savedFrame = _scrollView.frame;
_scrollView.contentOffset = CGPointZero;
_scrollView.frame = CGRectMake(0, 0, _scrollView.contentSize.width, _scrollView.contentSize.height);
[_scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
_scrollView.contentOffset = savedContentOffset;
_scrollView.frame = savedFrame;
}
UIGraphicsEndImageContext();
if (image != nil) {
[UIImagePNGRepresentation(image) writeToFile: @"/tmp/test.png" atomically: YES];
UIImage *yourImage = [UIImage imageNamed:@"/tmp/test.png"];
NSArray *itemsToShare = @[yourImage];
UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:itemsToShare applicationActivities:nil];
activityVC.excludedActivityTypes = @[ UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, UIActivityTypeMail, UIActivityTypeMessage, UIActivityTypePostToFacebook, UIActivityTypePostToTwitter, UIActivityTypePostToWeibo];
[self presentViewController:activityVC animated:YES completion:nil];
}
}
但是打印机能够打印(我用修复图像测试了它)…所以打印机似乎不是问题。
提前谢谢你的帮助
更新
我对代码做了一些更改/添加了几行代码:
[UIImagePNGRepresentation(image) writeToFile: @"/tmp/test.png" atomically: YES];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:@"/tmp/test.png" ];
UIImage* image = [UIImage imageWithContentsOfFile:path];
UIImage *ImageItem = image;
但它只在我设置writeToFile:@“test.png”
时起作用,但我只能保存一次图像,不能覆盖它
当我使用上面的代码执行此操作时,有一个错误:
由于未捕获的异常“NSInvalidArgumentException”而终止应用程序,原因:'-[\u NSPlaceholderArray initWithObjects:计数:]:尝试从对象[0]插入nil对象'
经过一点尝试,现在终于可以工作了
if (image != nil) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* path = [documentsDirectory stringByAppendingPathComponent:
@"test.png" ];
NSData* data = UIImagePNGRepresentation(image);
[data writeToFile:path atomically:YES];
UIImage* image = [UIImage imageWithContentsOfFile:path];
UIImage *yourImage = image;
或者无法访问此文件?